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Low Vision Conditions & Devices > Common Eye Diseases: Front of the Eye > Flashcards

Common Eye Diseases: Front of the Eye Flashcards

1
Q

What is in the front half of the eye?

A

cornea to the back of the crystalline lens

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2
Q

How is the type of keratitis classified?

A

by which layer of the cornea it affects

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3
Q

What are the two types of keratitis?

A

-Keratitis Sicca/Keratoconjunctivitis Sicca
-Herpes Simplex Keratitis

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4
Q

Keratitis refers to a disorder caused by tear deficiency or excessive evaporation of tears. True/False

A

True

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5
Q

What symptoms will someone with keratitis experience? 6

A

-Blurring of vision
-Burning of the eye
-Scratchiness
-Grittiness
-Discomfort or pain
-Excess tearing or redness

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6
Q

What virus commonly creates corneally inflammatory disorder (keratitis)?

A

Herpes Simplex

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7
Q

How quickly does the cornea heal after keratitis is diagnosed?

A

7-14 days in approx 85% of cases with drops or ointment

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8
Q

What medicine/procedures can be used to correct keratitis? 3

A

-drops
-ointments
-scraping virus of the diseased epithelium

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9
Q

What percentage of people will have keratitis over what time frame and in what areas?

A

50% recurrence rate over 5 years and may be highly localized in the lymph nodes, chin, eyes, and genitals.

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10
Q

For a corneal foreign body is vision affected?

A

It can be - depends on depth and location of the corneal foreign body

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11
Q

is a corneal foreign body an ocular emergency?

A

yes

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12
Q

What two things affect the prognosis of a corneal foreign body?

A

-the amount of tissue destruction
-rate of repair

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13
Q

Is copper/brass or iron/steel more irritating when a px has a metallic foreign body?

A

Copper/Brass

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14
Q

What is a high velocity foreign body a result of?

A

Hammering, chiseling or lathing

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15
Q

What are symptoms of a metallic foreign body? 3

A

-redness
-foreign body sensation
-photophobia

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16
Q

What happens after 6-8 hours of a metalic foreign body being in the cornea?

A

forms a rust ring in the corneal tissue

17
Q

What layers of the cornea does a corneal scar affect?

A

Bowman’s Membrane
Corneal strom

18
Q

Injury to the deeper layers in the cornea result in the formation of an opacity in the cornea. TRUE/FALSE

A

TRUE

19
Q

Can irregular astigmatism be caused by a trauma damaged cornea?

A

yes

20
Q

What does the prognosis of a corneal scar depend on?

A

how many layers the scar goes through

21
Q

What are 2 characteristics of herpes zoster (shingles)?

A

-severe neuralgic type of pain
-can be restricted to one side of the face

22
Q

What ocular conditions can someone with herpes zoster (shingles) experience? 2

A

Keratitis
Iritis

23
Q

What is the prognosis of someone who has herpes zoster (shingles)? 4

A

-Superficial and deep corneal ulcers
-Iritis
-Secondary glaucoma
-Paralysis of an extraocular muscle in the minority of instances

24
Q

What symptoms will someone with congenital glaucoma (extremely uncommon disease) have? 4

A

-appears extremely sensitive to light
-tears profusely
-corneal haziness
-Enlarged eyes

25
Q

What is the prognosis of congential glaucoma?

A

the earlier it is diagnosed the better and more likely it will be managed.

26
Q

What is keratocnous? 2

A

-degenerative disorder of the cornea
-structural changes of the cornea cause it to thin and become conical

27
Q

What is the prognosis of keratoconus?

A

depends when the patient first develops this disease

28
Q

What is pellucid marginal degeneration (PMD)?

A

-Degenerative corneal ecstatic disease that is often confused with keratoconus

29
Q

How is the cornea affected with pellucid marginal degeneration (PMD)? 3

A

-Thinning in the periphery of the cornea
-Corneas typically have a normal thickness in the center
-Inferior cornea exhibits a peripheral band of thinning

30
Q

What is the prognosis for PMD? (caught early/caught late ) 2

A

-Visual rehabilitation in the early stages and
-corneal transplant procedures in advanced stages

31
Q

Where does acanthamoeba live and whats the most likely time someone will get infected? 2

A

-happens with cls wear
-can be found in water

32
Q

What is the prognosis for acanthamoeba?

A

the patient can go blind if not treated in time

Low Vision Conditions & Devices (10 decks)

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