Pathology Flashcards

1
Q

Which tumours can affect the ventricles and choroid plexus

A

Colloid cyst - often at interventricular foramen
Ependymomas - arise from ependymal cells
Choroid plexus tumours

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2
Q

What is hydrocephalus

A

Accumulation of CSF in the brain
Usually due to some sort of blockage in the system
Can cause the head to enlarge and increases pressure in brain
Treated with a shunt

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3
Q

List the different types of ventricular haemorrhage

A

Epidural hematoma, arterial bleed between skull and dura
Subdural hematoma, venous bleed between dura and arachnoid
Subarachnoid haemorrhage

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4
Q

What is idiopathic intracranial hypertension

A

Increase in CSF pressure but no imaging features of hydrocephalus
No known cause
Causes headache and visual disturbance

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5
Q

What is papilloedema

A

Optic disc swelling due to raised intracranial pressure - puts pressure on the optic nerve
Causes enlarged blind spot, blurred vision and loss of vision
Graded from 1-5

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6
Q

What can cause raised intracranial pressure

A

Head injury
Space occupying lesion, tumour, abscess or haemorrhage
Hydrocephalus
Meningitis - leads to inflammation

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7
Q

What occurs if raised ICP is not relieved

A

Brain damage

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8
Q

What visual changes can occur with raised ICP

A
Transient blurry vision 
Double vision - diplopia 
Loss of vision 
Papilloedema 
Pupillary changes 

Can affect one or both eyes depending on cause

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9
Q

How can raised ICP affect the optic nerve

A

Compresses them
Will also compress the blood supply to the retina
Leading to swelling off the optic disc - papilloedema

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10
Q

What visual symptoms occur with papilloedema

A
Transient visual obscurations 
Transient flickering 
Blurring 
Constriction of the visual field 
Decreased colour perception
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11
Q

Describe the appearance of the optic disc in papilloedema grade 1-5

A
Blurry margins in all grades 
1 - C shaped halo 
2 - circular halo 
3 - peripheral vessels disappear from view 
4 - central vessels disappear 
5- no visible vessels
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12
Q

What can damage the oculomotor nerve

A

Compression by raised ICP

Tentorial herniation - pushed through notch by raised ICP

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13
Q

Which fibres tend to be affected first when the oculomotor nerve is compressed

A

Parasympathetic

They usually sit on the outside of the nerve

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14
Q

List symptoms of oculomotor nerve damage

A

Paralysis of extra-ocular muscles
No/slow pupillary reflex (parasympathetic not working)
Dilated pupil - when it becomes fixed it means there has been severe damaged
Ptosis - damage of nerve to LPS
Eye looking down and out - superior oblique still works

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15
Q

Describe symptoms of trochlear nerve damage

A

Paralysis of superior oblique muscle - cannot move inferomedially
Diplopia when looking down

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16
Q

What is diplopia

A

Double vision

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17
Q

What can damage the trochlear nerve

A

Stretching
Compression - ICP
isolated injury is very unusual

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18
Q

What type of damage is the abducent nerve susceptible to

A

Stretch

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19
Q

What are the symptoms of abducent nerve damage

A

Eye can’t move laterally in horizontal plane - lateral rectus is paralysed
Medial deviation of eye

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20
Q

What are cataracts

A

Opacification within the lens

Leads to reduction in vision which affects daily living

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21
Q

What can cause cataracts

A

Degenerative changes in lens fibres - age (most common)
Cumulative UVB damage
May also be caused by hypertension, smoking
Trauma - can be a sudden cataract
Metabolic - diabetes
Congenital
Drug induced - steroids
Intra-uterine infections - rubella, CMV, toxoplasmosis

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22
Q

What is glaucoma

A

A group of diseases characterised by progressive optic nerve damage and visual field loss
Abnormal increase in pressure in the eye
Due to the amount of vitreous fluid and aqueous humour

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23
Q

What areas of the eye does glaucoma have the biggest consequences

A

Optic disc and nerve

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24
Q

What causes 50% of blindness worldwide

A

Cataracts

rarely causes blindness in UK but is the most common cause of gradual visual impairment,

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25
What are the two types of glaucoma
Open angled - primary and secondary | Angle closure - primary or secondary
26
What causes open angled glaucoma
Poor drainage through the trabecular network Fluid builds up Primary - nothing to see in eye Secondary - there is something else is blocking the drains – red cells, white cells in uveitis, protein etc.
27
How does open angled glaucoma present
Very slow onset Usually asymptomatic - picked up by screening Will see an open anterior chamber angle, raised intra-ocular pressure, “cupping” of the optic disc and progressive loss of visual fields
28
How do you treat primary open angled glaucoma
Pharmacological treatment - prostaglandin then B-blocker or CAI then truspot/alphagan Then surgery - trabeculectomy Make a fistula in the eye to allow drainage
29
What causes angle closure glaucoma
Iris becomes opposed to the lens and stops fluid flowing round to the trabecular network Drainage is patent but fluid cannot get to it The iris can close over the angle Fluid builds up and increases pressure
30
How does angle closure glaucoma present
``` Unilateral Visual loss Pain Red eye Cloudy / Hazy cornea Fixed, mid dilated pupil Severe headache May have nausea and vomiting Raised intra-ocular pressure (50-80mmHg) ``` Can be a medical emergency
31
How do you treat angle closure glaucoma
Laser treatment to the iris - iridotomy Zap a hole to allow fluid to drain - reduces recurrence Can also give IV Diamox – carbonic anhydrase inhibitor, topical anti-hypertensives, topical steroids, pilocarpine
32
What is 'cupping' of the optic disc
Edges of the optic disc become rolled up and the centre depressed Caused by pressure damage
33
Which cancers can affect the eye
BCC SCC Melanoma
34
Which part of the body is the only one with no reported incidence of malignancy
lens
35
What is conjunctivitis and how does it present
Inflammation of the conjunctiva Caused swelling, redness, pain and heat Usually viral
36
What is scleritis and how does it present
Inflammation of the sclera rarer and more severe Associated with pain on movement and deep redness
37
Episcleritis is usually self-limiting - true or false
True | It's a superficial inflammation
38
What is ARMD
Age related macular degeneration
39
What are the 2 types of macular degeneration
Dry - no vascular proliferation - more common Wet - vascular proliferation - eye grows new blood vessels within the macula to ‘repair’ dry ARMD damage but they leak
40
How do you treat wet macular degeneration
Anti-VEGF monoclonal antibodies Injected into the eye Stops proliferation of blood vessels
41
What is Drusen
Accumulation of dry product of inflammation (e.g. proteins, lipid etc) Appear as little yellow plaques on retina
42
What is an Argyll Robertson pupil
Accommodates but doesn’t react | Doesn’t constrict/dilate but you can see near and far
43
What eye pathologies can be caused by diabetes
``` Blurred vision - increased osmotic pressure Peripheral neuropathy can affect eyes Cataracts Rubeotic glaucoma Retinopathy ```
44
How does diabetes cause cataracts
Increased sugar in lens, converted to sorbitol which gets stuck in the cells Alters the osmotic gradients and leads to swelling and fibre disruption
45
What is retinopathy
Poor functioning of vessels in the eye Leaky and haemorrhages Leads to vision loss
46
What vascular diseases can affect the eye
Arterial occlusion -thromboembolic disease in carotids | Venous - giant cell arteritis (temporal)
47
What happens if you have a TIA in the central artery of the eye
Sudden visual loss in one eye - like a curtain coming down | Not painful
48
What is the cardinal feature of an eye movement defect
Double vision (diplopia)
49
What is the cardinal feature of a visual defect
Loss of visual acuity | Loss of visual fields
50
List potential causes of eye disease
``` Vascular disease Tumours - SOL Trauma Demyelination - MS Inflammation/infection Congenital abnormalities ```
51
What does a VIth nerve palsy lead to
Palsy of the lateral rectus Will no longer be able to abduct the eye Causes horizontal double vision
52
What can cause a VIth nerve palsy
Microvascular Raised Intracranial pressure Tumour - acoustic neuroma Congenital
53
Why is the VIth nerve susceptible to damage by raised ICP
The course of the nerve | It runs over a tip in the bone and is easily compressed
54
What does a IVth nerve palsy lead
Palsy of the superior oblique muscle Eye will sit higher and outwards Cannot move the eye down and in Get vertical double vision
55
How might people compensate for a IVth nerve palsy
Tilting their head
56
What can cause a IVth nerve palsy
Congenital defect Microvascular complication Tumour If bilateral it is usually trauma
57
How does the eye appear in a IIIrd nerve palsy
Eye will sit down and out Dilated pupil Drooping eyelid Affects MR, SR, IR, IO, sphincter papillae and LPS
58
What can cause a IIIrd nerve palsy
``` Microvascular problems Tumour Aneurysm (will be painful!) - 3rd nerve passes very close the PCA so aneurysm in this can compress the nerve MS Congenital ```
59
What causes inter-nuclear ophthalmoplegia
MS Vascular issues etc etc
60
What is the inter-nuclear pathway involves in
Allows the eyes to work together | SO they look the same way, at the same time, at the same speed
61
What pathologies commonly cause defects in the optic nerve
Ischaemic optic neuropathy Optic neuritis - common in MS Tumours - rare
62
How does an optic nerve defect affect the visual fields
Either complete loss of vision unilaterally or loss of horizontal field in one eye
63
How does optic neuritis present
``` Progressive, unilateral vision loss Pain behind the eye, especially on movement Colour desaturation Central scotoma Enlarging blind spot RAPD Optic disc swelling ```
64
Which pathologies can affect the optic chiasm
Pituitary tumour Craniopharyngioma Meningioma
65
Defect in the optic chiasm leads to what visual defect
Bitemporal hemianopia
66
What pathologies can cause defects in the optic tracts and their radiations
Tumours Demyelination Vascular anomalies
67
How does a defect in the optic tracts and their radiations present
Homonymous defect - affects the same side of each eye Macula is not spared Affects in quadrants or as hemianopia (halves)
68
What pathologies can cause defects in the occipital cortex
Vascular disease | Demyelination - MS
69
How do defects in the occipital cortex present
Homonymous defect - affects same side of both eyes | Macular sparing
70
List causes of sudden visual loss
``` Vascular occlusion - central retinal artery or vein Ischaemic optic neuropathy Vitreous haemorrhage Amaurosis Fugax Retinal detachment Retrobulbar neuritis ARMD - wet type Closed angle glaucoma Optic neuritis Giant Cell Arteritis Cerebral infarct involving the optic tract or occipital cortex ```
71
Haemorrhage from abnormal blood vessles occurs in which eye pathologies
Diabetic retinopathy | Wet ARMD
72
What are the signs and symptoms of a central retinal artery occlusion
``` Sudden visual loss - total or subtotal No pain RAPD Pale retina Pink spot at fovea as still has some blood supply from choroid - cherry red spot ```
73
What can cause a central retinal artery occlusion
Carotid artery disease Emboli from the heart - may see common CV risk factors GCA
74
What can cause a central retinal vein occlusion
Endothelial damage - diabetes Abnormal blood flow - hypertension Hypercoagulable states - cancer
75
What are the signs and symptoms of a central retinal vein occlusion
``` Sudden vision loss - mod to severe Painless RAPD Retinal haemorrhages - flame shaped, stormy sunset Cotton wool spots Dilated, tortuous veins Disc swelling ```
76
What is ischaemic optic neuropathy
Occlusion of the circulation to the optic nerve head Can be caused by giant cell arteritis (inflammation occludes the vessels) or atherosclerosis (usual risk factors) Leads to sudden, severe visual loss - irreversible RAPD Swollen optic disc with hyperaemia. Pale disc later
77
List symptoms of giant cell arteritis
``` Headache - temporal Jaw/tongue claudication Scalp tenderness Tender and enlarged scalp arteries Malaise Shoulder girdle weakness Recent weight loss Sudden visual loss - if progresses to ION May also have blurred vision, amaurosis fugax and diplopia ```
78
What are the symptoms of a vitreous haemorrhage
Sudden loss of vision Floaters in vision Loss of the red relflex May see the haemorrhage on fundoscopy
79
What are the signs and symptoms of retinal detachment
``` Painless vision loss Sudden onset of flashes/floaters Dark shadow in peripheral vision, increasing in size May have RAPD May see the tear with ophthalmoscope ```
80
Sudden visual loss occurs with dry ARMD - true or false
False It occurs with wet ARMD Dry leads to progressive loss
81
What are the signs and symptoms of wet ARMD
``` Rapid central visual loss Distortion - straight lines bend (metamorphopsia) Haemorrhage and exudate on imaging Oedema over macula - slightly paler Fluid build up on OCT ```
82
What are the signs and symptoms of closed angle glaucoma
``` Painful, red eye Sudden visual loss Headache Nausea and vomiting Cloudy cornea Circumcorneal injection Dilated pupil ```
83
List causes of gradual visual loss
``` Cataract Dry ARMD Refractive error Glaucoma - open angle Diabetic retinopathy Age related changes ```
84
What are the symptoms of cataracts
Gradual visual decline - haziness/blurriness | May get a glare
85
How do you treat cataracts
Surgical removal of the lens - phacoemulsification | Replace with an intra-ocular lens implant
86
What are the signs and symptoms of dry ARMD
Gradual visual decline - blurriness Central vision missing - central scotoma Drusen - build up of exudate seen as yellow deposits around macula May also see abnormal pigmentation in this area Atrophic parts of retina on imaging
87
What is a refractive error
Eye cannot clearly focus images | Includes being short or long sighted and stigmatism
88
What are the signs and symptoms of open angled glaucoma
Often asymptomatic - picked up by optician Cupped disc Visual field defects High IOP
89
How does raised ICP lead to papilloedema
Optic nerve is also surrounded by meninges and therefore CSF So an increase in pressure in the SAS around the optic nerve affects it
90
What is the major complication of raised ICP
Brain ischaemia and swelling | Brain gets pushed through the foramen magnum which compresses the brain stem and the patient will stop breathing
91
Malignant hypertension can lead to papilloedema - true or false
True
92
What leads to accumulation of CSF
Obstruction to it's circulation Overproduction Inadequate absorption
93
What is idiopathic intercranial hypertension
Cause of papilloedema May be a result of stenosis of cerebral sinuses, increased abdominal pressure (obesity), microemboli Poorly understood
94
What can happen if disc swelling becomes chronic
They become atrophic and pale | There may be a loss of visual function and even blindness
95
What signs might you see in retinopathy
Microaneurysms - dot and blot haemorrhages Hard exudate Cotton wool patches Abnormal blood vessels Venous beading – segmentation of the veins IRMA – shunt vessels between the arterioles and venules formed by the ischaemic drive, normal vessels, not very leaky
96
What drives new vessel formation
VEGF
97
What is the difference between NVD and NVE
NVD - new vessels on disc - worse prognosis - suggests severe ischaemia NVE - new vessels in periphery - occurs locally to the ischaemia
98
What is rubeosis iridis
Vessel formation on the iris Due to extreme VEGF production due to severe ischaemia Irreversible Very poor prognostic sign – suggests severe ischaemia
99
Why can diabetic patients lose vision
Retinal oedema Vitreous haemorrhage Scarring and tractional retinal detachment
100
How do you manage diabetic eye disease
``` Optimise control Laser treatment - photocoagulation to stop bleeds Vitrectomy - surgical Rehabilitation Anti-VEGF injections ```
101
List features of hypertensive retinopathy
``` Attenuated blood vessels Cotton wool spots Hard exudate Retinal haemorrhage Optic disc oedema ```
102
How does an infarcted retina appear
Very Pale
103
What are keratic precipitates
Deposits of white cells in the eye | Appear as little white dots in the eye
104
List some infective causes of uveitis
TB Herpes zoster Syphilis
105
List some non-infective causes of uveitis
Idiopathic Sarcoidosis Ankylosing spondylitis Juvenile arthritis
106
List features of thyroid eye disease
``` Proptosis Lid retraction and lag Lid oedema Restrictive myopathy Glaucoma Injection ```
107
How can SLE affect the eyes
Leads to red, inflamed eyes | Deep tissue involved - scleritis
108
How can RA affect the eyes
Dry eyes Scleritis Corneal melt
109
How does Marfan's present in the eyes
Displacement of the lens | Will go up the way
110
\what can cause a subconjunctival haemorrhage
Can be spontaneous - particularly if on anti-coagulants Trauma Hypertension
111
What can lead to orbital cellulitis
Insect bite Eye lid trauma In kids it's often caused by sinus infection that travels up to eye
112
What is the major consequence of orbital cellulitis
Brain abscesses - this can be life threatening
113
Who is vulnerable to acanthamoeba infections
Contact lens wearers
114
Describe how different types of pain suggest pathology in different parts of the eye
Grittiness - surface problem | Achy pain - intraocular
115
What is the difference between anterior and posterior blepharitis
Anterior - lid margin and lashes affected - lid margin is redder than deep eye Posterior - due to Meibomian gland dysfunction - redness is in deep part of the lid
116
What are the Meibomian glands
oil secreting glands in the posterior part of the lid | if they don't work properly it can lead to blepharitis
117
What are the symptoms of blepharitis
Similar to conjunctivitis Gritty eyes - foreign body sensation Mild discharge
118
What are the signs of seborrheic anterior blepharitis
Red lid margin Lots of scales No ulcers Lashes stuck together
119
What are the signs of staphylococcal anterior blepharitis
Red lid margin Lashes distorted - loss or ingrown Styes Marginal ulcers
120
What are the signs of posterior blepharitis
lid margin and lashes unaffected Gland opening swollen Dry secretions at gland openings Meibomian cysts
121
What other condition is posterior blepharitis associated with
Acne rosacea
122
How do you treat blepharitis
Lid hygiene - daily bathing Supplementary tear drops Oral doxycycline for 2-3 months
123
List causes of conjunctivitis
``` Viral - watery, after URTI Bacterial - purulent, sticky Chlamydia - low grade and chronic Allergic Chemical/drugs Associated with skin disease ```
124
List symptoms of conjunctivitis
``` Red eye Foreign body sensation - gritty eyes Discharge - watery or purulent Pre-auricular lymph nodes - viral causes Chemosis Itch (in allergic) Papillae or follicles Vision unaffected ```
125
In herpes zoster infections, why would you be concerned if the nose was affected
If the tip of the nose is affected it means the nasocilliary nerve has been affected and so it is likely the eye will be involved This is when shingles affects the V1 nerve
126
List signs and symptoms of corneal ulcers
``` Pain - needle like and severe Photophobia Profuse lacrimation - watery Red eye - around the cornea Corneal opacity Staining with fluorescein Hypopyon ```
127
How do autoimmune corneal ulcers occur
Common in RA | Indicates that the systemic autoimmune condition is poorly controlled
128
Aside from bacteria and viruses, what can cause corneal ulcers
Exposure keratitis - seen in those who cannot fully close their eyes (thyroid or nerve palsy) Dry eyes - Sjorgen's Neurotrophic - herpes zoster Vit A deficiency
129
How do you treat a corneal ulcer
Corneal scrape to identify cause Antimicrobials if bacterial Antiviral if herpetic - aciclovir for 7-`10 days Anti-inflammatory if autoimmune
130
List causes of anterior uveitis
Idiopathic - 50-60% Autoimmune - UC, sarcoid, ank spond (associated with HLA-B27) Infective - TB, syphilis, herpes (uncommon) Malignancy Trauma
131
List signs and symptoms of anterior uveitis
``` Pain - dull ache May have reduced vision - blurry Photophobia Red eye - around cornea Ciliary injection Cells and flare in anterior chamber Precipitates Hypopyon Irregular pupil Posterior synechiae – pupil gets stuck down, may not dilate well ```
132
How do you manage anterior uveitis
Topical steroids - 4-8 weeks Hourly with gradual taper Mydriatics - paralyses the muscle and reduces photosensitivity and pain from spasm Investigate systemic causes
133
Which other pathology is episcleritis associated with
Gout
134
How do you differentiate between episcleritis and scleritis
Adding a vasoconstrictor like topical phenylephrine – in episcleritis the redness would blanche, if deeper inflammation like scleritis it would not
135
How do you manage episcleritis
Usually self-limiting Lubrication Rarely a topical NSAID
136
Which other pathologies is scleritis associated with
RA Wegener's granulomatosis Many connective tissue diseases
137
List symptoms of scleritis
VERY painful Will wake you up from sleep and cannot touch the eye Injections of the deep vascular plexus - diffuse and deep redness
138
How do you treat scleritis
Oral NSAIDs Oral steroids Steroid sparing agents
139
A droopy eyelid may be a sign of what extra-ocular pathology
Lung cancer | This is a sign of Horner's syndrome (constricted pupil and reduced ipsilateral sweating)
140
What is RAPD and how would you diagnose it
Relevant afferent pupil defect Do the swinging light test You would see paradoxical dilation of one pupil when you shine the light in it
141
New vessels form in dry ARMD - true or false
False | This occurs in wet ARMD and can lead to visual loss
142
What are the signs of a macular pathology
Disturbance of central vision | Straight shapes and faces become distorted
143
How can you treat diabetic retinopathy
get diabetes under control laser treatment - target the new vessels anti-VEGF injections
144
In the UK, what vision level is considered partially sighted
6/60
145
In the UK, what vision level is considered severely visually impaired
3/60
146
What is emmetropia
normal vision
147
What is presbyopia
Loss of accommodation seen in old age
148
What is myopia
being short sighted | Eye is too large so focuses light before the retina
149
what is hypertropia
being long sighted | eye is small so focuses light behind the retina
150
List causes of a red eye
``` Infective Conjunctivitis Foreign Body Allergic Conjunctivitis Corneal Abrasion Blepharitis/ Chalazion Dry Eyes Subconjunctival Haemorrhage Glaucoma Anterior Uveitis ```
151
Pain and photophobia is characteristic of which condition
Anterior uveitis
152
Superficial dendritic ulcers are characteristic of what
Herpes simplex infection/ulcer
153
Sudden and painful loss of vision is suggestive of what
Acute angle closure glaucoma
154
What is amaurosis fugax
A transient loss of vision in one eye lasting usually | only a few minutes and at most a few hours - essentially a TIA involving the eye
155
What can cause amaurosis fugax
Usually secondary to embolic event from carotid or heart | Must be investigated as a TIA – risk of stroke is high
156
How do you treat wet ARMD
Anti-VEGF injections - injected straight into the vitreal body of the eye This inhibits the growth factors stimulating new vessel growth
157
What are the risk factors for diabetic retinopathy
Increased duration of diabetes - 90% of type ones will have it after 20 years Poor diabetic control
158
Active treatment is available for dry ARMD - true or false
False | Only available for wet ARMD in the form of anti-VEGF injections
159
Halo's forming around lights is a sign of which eye condition
Associated with corneal oedema which is seen in acute angle closure glaucoma
160
Giant cell arteritis can lead to irreversible blindness - true or false
True One of the true ophthalmic emergencies Blindness can be bilateral and irreversible
161
How do you treat giant cell arteritis
High dose oral steroids which are tapered down over months
162
What type of discharge is seen in bacterial eye infections
Sticky and purulent
163
What type of discharge is seen in viral eye infections
Watery | Also seen in surface eye irritation such as foreign bodies
164
What type of eye pain indicates a surface issue
Scratchy / gritty / discomfort | E.g. conjunctivitis, foreign body
165
What type of eye pain indicates an intraocular issue
Severe / deep / aching pain | E.g. iritis, scleritis, angle closure glaucoma
166
What type of redness indicates an intraocular issue
Diffuse injection | If it is greatest around the cornea - circumcorneal
167
What is chemosis
Oedema of the conjunctiva Makes the eye look like jelly | Seen in conjunctivitis
168
How do you treat bacterial conjunctivitis
Treat with topical antibiotics ie chloramphenicol
169
How do you treat viral conjunctivitis
Supportive treatment | Cool compresses, lubricants etc.
170
What features are suggestive of chlamydia conjunctivitis
Young patient - sticky + red in first 10 days after birth Unilateral Follicular conjunctivitis Diagnose by PCR swab
171
List risk factors for corneal ulcers
Corneal abrasion Contact lens wearer Dry eye Iatrogenic -loose suture or surgery
172
If you apply topical steroids to a herpetic ulcer what can happen
It can lead to a geographic ulcer - the infection spreads across the eye
173
How do you treat chlamydial conjunctivitis in an infant
Swabs Erythromycin contact traces
174
How does a blocked nasolacrimal duct present in infancy
Sticky + white uninflamed eye from 2 months | Congenital block in the duct
175
How do you treat a blocked nasolacrimal duct
Bathe and massage sac Most resolve spontaneously by 1 year Syringe and probing if not resolving
176
What is the leading cause of blindness in people of working age in industrialized countries
diabetic retinopathy
177
List risk factors for developing diabetic retinopathy
``` Increasing duration of diabetes Poor blood sugar control Hypertension Dramatically* improved diabetic control - sudden increase in control leads to short term worsening of the retinopathy Hypercholesterolaemia Pregnancy ```
178
Describe the pathogenesis of diabetic retinopathy
Chronic hyperglycaemia Glucose molecules attaches to the basement membrane of the vasculature of the retina Causes a loss of pericytes This leads to vascular dysfunction and increases permeability Reduced O2 transport leads to tissue hypoxia Vaso-formative factors produced - VEGF New vessel formataion occurs to overcome the hypoxia New vessels do more harm than good – they leak a lot Get haemorrhage and scarring
179
What is the function of the pericytes in the eye
Pericytes help with the tight junctions in the eye vasculature – maintain eye/blood barrier They are lost in diabetic retinopathy
180
How can diabetic retinopathy lead to retinal detachment
DR can cause scarring | Contraction of scarring in the vitreous can lead to retinal detachment
181
What causes visual loss in diabetic retinopathy
Retinal oedema affecting the fovea - macular oedema Vitreous haemorrhage - due to leaking of the new vessels Scarring/ tractional retinal detachment
182
How is diabetic retinopathy classified
By the grade of the retinopahty and the maculopathy
183
List the grades of retinopathy seen in diabetic retinopathy
``` None Mild - micro-aneurysms Moderate - microaneurysm, hard exudates, flame shaped haemorrhage Severe Proliferative - new vessles ```
184
How do you manage each grade of retinopathy
None-severe - observe and re-screen | If proliferative you give laser treatment
185
List the grades of maculopathy seen in diabetic retinopathy
No maculopathy Observable maculopathy - exudates between 1 & 2 disc diameters of the centre of the fovea Referable maculopathy - any blot haemorrhages or hard exudates – within 1 disc diameter
186
How can you treat the maculopathy seen in diabetic retinopathy
You treat if they have reduced vision Intravitreal anti-VEGF injections are the gold standard now – better outcomes for preserving vision Focal laser at macula – if they don’t respond to injection
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Describe the pathogenesis of glaucoma
Usually blockage to aqueous outflow - obstruction to drainage Causes raised intra-ocular pressure Damage and loss of retinal nerve fibres at optic disc Visual field loss
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What is considered normal IOP
11.5-21.5 mmHG is considered normal
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Why is peripheral vision lost first in glaucoma
In periphery lots of photoreceptor's feed into the same ganglion cell, in the macula less photoreceptors per ganglion Therefore, loss of ganglion cells in periphery is noticed first as it wipes out more photoreceptors
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List risk factors for primary open angle glaucoma
``` Age raised intraocular pressure Afro-Carribean origin Family history Myopia – short sighted is a risk ```
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Being highly myopic (very short sighted) increased the risk of which other condition
Retinal detachment - have larger eye so retina is thinner and vitreous is more watery so can move about more and separate more easily Open angled-glaucoma
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Being highly hypermetropic (very long sighted) increased the risk of which other condition
Acute angle closure glaucoma
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What are the main subtypes of cataract
Nuclear Sclerotic – most common type, brown/green appearance Cortical – spoke like pattern Posterior Subcapsular - cataract develops at the back of the lens between the lens and the back of the capsule Mature - appears white
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A mature cataract has an increased operative risk - true or false
True
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What is the most common cause of blindness in the elderly in the western world
ARMD
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How do you manage dry ARMD
No active treatment, just prevent progression to wet ARMD Low Visual Aids Dietary / smoking advice - Vitamin rich diet can reduce further visual loss and prevent progression to Wet ARMD - Macula is very sensitive to smoking damage so promote cessation Amsler Grid - allows patients to monitor visual distortion – one of the first signs of progression to wet is increased distortion of straight lines Blind registration
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What is OCT
Ocular Coherance Tomography Cross sectional map of the retina Can be used to diagnose and monitor wet ARMD
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How do you treat a central retinal artery occlusion
Only effective if presentation within 12-24 hrs Treatment aims at dislodging blockage and restoring circulation Ocular massage - can change the pressure in the eye and force may dislodge the blockage Paper bag breathing – increases PCO2 which causes reflex vasodilation and may allow the blockage to move IV Diamox - CAI which drops the intraocular pressure so pressure behind blockage is greater than in front and may push it on Anterior Chamber Paracentesis – remove some aqueous fluid to reduce IOP and again move blockage down vascular tree
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What causes a cotton wool spot to appear in the retina
It is ischamia of the nerve fibre layer of retina
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How do you treat a central retinal vein occlusion
If no signs of ischaemia - observe (every 3 months initially then less frequently) If ischaemic but no neovascularition - observe closely (every 4-6 weeks ) If ischaemic with neovascularisation – requires urgent argon laser pan-retinal photocoagulation also try and find underlying risk factors and modify them
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How do you treat ischaemic optic anterior neuropathy
No active treatment | Assess and treat the risk factors - e.g. smoking
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How do you treat a retinal detachment
If picked up as early retinal tear can be lasered to prevent progression to proper detachment Vitrectomy – similar to keyhole in the eye, clear away the vitreous gel, laser the initial tear and put a bubble of gas in to hold retina in place while things heal
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What is retrobulbar neuritis
Similar to optic neuritis except the inflammation is behind the optic nerve head so cannot be seen
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Which eye symptoms and signs can suggest a neurological issue
Optic nerve function – acuity, visual field, colour vision, pupil response Ocular motility – 3rd, 4th, 6th nerve palsies
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What investigations should be done for bilateral papilloedema
Suggests raised ICP Needs urgent imaging to rule out SOL If no SOL you may be looking at IIH which can be diagnosed by LP
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How do you trea optic/retrobulbar neuritis
IV steroids may hasten recovery but not affect final VA. Oral steroids may worsen outcome May be role for B Interferon
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What can cause Horner's syndrome
``` Pancoast tumour Carotid/Aortic aneurysms Lesions of neck Congenital Idiopathic ``` Anything affecting the sympathetic chain
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Horizontal field defects are seen when which part of the tract is affected
Anything in front of the chiasm
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Vertical field defects are seen when which part of the tract is affected
Structures behind the chiasm
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What is a hyphaema
Fluid level of blood in the eye
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What is a hypopyon
Fluid level of white blood cells in the eye | Sign of severe intra-ocular infection