External Eye and Cornea Flashcards
What does Alcian blue stain for and what coneal dystrophy is it used to demonstrate in corneal specimens?
It stains for mucopolysaccharides and is used to stain specimens with macular dystrophy
What does the material found in corneals with lattice dystrophy consist of?
Amyloid
Bilateral conrneal edema in a newborn with normal intraocular pressues and normal corneal diameters suggest what diagnosis?
Congenital heredity endothelial dystrophy. Two forms are recognized: one with an autosomal dominant pattern of inheritance, the other with a recessive pttern of inheritance. Deafness is sometimes an associated finding. Normal intraocular pressure and normal corneal diamter help distinguish this entity from congenital glaucoma.
What Chlamydial serotypes cause inclusion conjunctivitis?
Serotypes D to K
What is the recommendned treatment for gonorrhal infection in an otherwise healthy adult.
Cefrtriaxone 1 gm IM for 5 consecutive days.
What are the main antibodies found in tears?
IgA and secretary IgA
If taken in high doses for long periods of time, what type of deposit can chlorpromazne produce in the cornea?
It can produce a brownish, poweder-like deposit in the deep storma of the cornea.
What is Mooren’s ulcer?
It is a peripehral ulcerative keratitis caused by ischemic necrosis from vasulitis of limbal vessels.
Describe the two varities of Mooren’s ulcer
The limited or torpid is usually unilateral (75%) and seen in an older patient population with equal sex distribution. The second type is usually bilateral (75%), rapidly progressive and typially found in young Nigerian males, which may be an antigen-antibody reaction to helminithic toxins.
Which member of the herpes virus family does not produce a keratitis?
CMV
What is Artl’s line?
It consists of subconjunctival scarring along the upper tarsal plate and is seen in trachoma.
What are Cogan’s patches?
Dellen anterior to horizontal rectus insertions in the elderly.
What is an easy way to distinguish episcleritis from scleritis from scleritis?
Topical phenylephrine will blanch the inflamed episcleral vessels, but not the scleral ones.
What is the most common cause of the 29% of deaths that occur within five years of the onset of necrotizing scleritis?
Complicatiosn of systemic vasculitis
Patients with long-standing rheumatoid arthritis can develop a necrotizing scleritis without signs of inflammation known as what?
Scleromalacia perforans
What is the definition of giant papillae?
Papillae ≥ 1 mmPapillae ≥ 1 mm
What are Haab’s stiae?
They are horizontal curvilinear lines representing healed breaks in Descemet’s membrane and occur in eyes with congeital glaucoma.
What are Vogt’s striae?
They are vertical stress lines in the corneal stroma which disappear with external pressue and are an early sign of keratoconus.
What is Munsons’s sign
It is a late sign of keratoconus and characterized by indentation of the lower eyelid by the cornea in downgaze.
What are Tranta’s dots
Tranat’s dots are white spots composed of eosinophils at he limbus of patients with limbal form of vernal conjunctivities and may also occur in atopic keratocnjunctivities and soft contact lens wear.
What is a Bitot’s spot?
It is a foamy white lesion found at the limbus found in association with vitamin A deficinecy
What are Herbert’s pits?
They are regressed limbal follicles leaving behind depressed scars and are found in trachoma.
What is the inheritance pattern of Reiss-Bucklers’ dystrophy?
Autosomal dominant.
What are the causes of interstitial keratitis?
- Viral: herpes simples, herpes zoster, mumps 2. Bacterial: syphilis, tuerculosis, leprosy, Lyme disease, brucellosis. 3. Parasitic: acnathoamoeba, trypanosomiasis, onchocerciasis, leishmaniasis, filariasis. 4. Cogan’s syndrome.
What is Cogan’s syndrome?
It is a bilateral interstitial keratitis associated with bilateral deafness, tinnitus and vertigo. Early diagnosis and treatment with systemic steriods may prevent permanent deafness.
What systemic disease may be associated with Cogan’s syndrome?
Polyarteritis nodosa
What other disease besdies Cogan’s syndrome can cause interstitial keratitis associated with deafness?
4% of patients with syphilitic interstitial keratitis eventually become deaf months or years after the acute episode.
What are some causes of enlarged corneal nerves?
- Keratoconus 2. Multiple endocrine adenomatosis (MEA) 3. Congenital ichothyosis 4. Idiopathic 5.Refsum’s disease 6.Neurofibromatosis 7.Leprosy 8.Posterior polymorphous dystrophy 9.Fuch’s endothelial dystrohpy 10. Reiss-Buckler’s dystrophy
Beading of corneal nerves or a string of pearls appearing to the corneal nerves suggests what ystemic problem?
Leprosy. Lid skin may be thickened and lashes can be absent. In addition, the iris may show characteristic creamy white “pearl” lesions.
What is Ferry’s line
It is an iron deposit in the cornea near a filtering bleb.
A 39-year-old nurse presents with a history of non-healing corneal abrasion that is associated with pain, redness and dense ring infiltrate. She was treated previously with two weeks of intense fortified antibiotics. Cultures performed prior to starting her topical antibiotics were negative for bacteria and fungus. What is the most likely diagnosis?
Anestheic abuse; more common in health care personnel that have access to proparacaine and tetracaine. Suspect the diagnosis in non-healing corneal lucers or abrasions which are culure negative. Dense white ring infiltrates, corneal edema, and even a hypopyon are possible findings.
What malignancies are associated with multiple endocrine adenomatosis type Iib (Sipple-Gorlin syndrome)?
Medullary thyroid carcinoma, pheochromocytoma and mucosal neuromas.
A 30-year-old male presents for a routine eye exam and refraction. Slit lamp exam reveals are shaped superior corneal thinning with blood vessels extending from the limbus across the area of thinning. Lipid deposition is present at the central edge of the thinned cornea. The epithelium over the area of thinning is intact. The opposite eye appears normal on slit lamp exam. What is the diagnosis?
Terrien’s marginal degeneration. Note that this is often bilateral but can be present unilaterally.
What would the refraction of the case above most likely show?
High “against the rule” astigmaism in the opposite axis of the thinning.
What are the ocular features of Ehlers-Danlos syndrome?
- Anterior segment: keartoconus, keratoglobus, blue sclera, lens subluxation 2. Posterior segment: high myopia and retinal detachment
What is Ehlers-Danlos syndrome?
It is a dominantly inherited collagen disorder caused by a deficiency in hydroxylysine. Its main systemic features are: 1. Hyperelastic skin that bruises easily and heals slowly. 2. Joint hypermobility. 3. Cardiovascular disease. 4.Daphragmatic hernia. 5. Diverticuli of the respiratory and GI tracts.
What are the ocular features of osteogenesis imperfecta?
- Blue sclera. 2. Keratoconus. 3. Megalocornea.
What mucopolysaccharidoses are associated with corneal clouding?
Hurler’s, Scheie’s, Morquio’s and Maroteaux-Lamy[s but not in Hunter’s and Sanfilippo’s
What is the primary anitbiotic of choice for an identified Gram-positive keratitis?
Fortified cephalosporins, eg. Cefazolin
Is an intraocular tap and systemic antibiotics indicated in patients with bacterial keratitis and reactive hypopyon?
Unless there has been ocular perforation, the presence of hypopyon is almost always a reactive phenomenon and does not signify endophthalmitis.
What are the systemic causes of scleritis?
No. An intraocular tap may be hazardous in patients with this condition, since it runs the risk of introducing the organisms into the eye.
What viruses usually cause acute hemorrhagic conjunctivitis?
- Rheumatoid arthritis. 2. Collagen vascular disorders: Wegener’s granulomatsis, polyarteritis nodosa, systemic lupus erythematosus. 3. Relapsing polychondritis. 4. Herpes zoster. Porphyria
What are some causes of corneal verticillata?
Enterovirus 70 and coxsackie A24, although adenovirus type 11 and 37 have also been implicated.
What is Fabry’s disease?
- Drugs: amiodarone, anti-malarials, indomethacin, tamoxifen, chlorpromazine, meperidine, amodiaquine. 2. Fabry’s disease.
What other anterior segment findings are found in Fabry’s disease?
It is a disorder caused by a deficiency in the enzyme alpha-galactosidase. Patients develop angiokeratomas, cardiovascular and renal lesions and episodes of severe pain in the fingers and toes.
What does the material in granular dystrophy consist of, and what is the best stain for it?
Spoke-like lens opacities
What is Salzmann’s nodular degeneration?
The granular material is composed of hyaline and stains brigh red with Masson’s trichrome stain.
What is the appearance of Salzmann’s nodules histopathologically?
Localized replacement of Bowman’s layer by hyaline and fibrillar material
A middle-aged man presents with a peripheral ulcerative keratitis and a positive hepatitis B surface antigen (HbsAg) lab result. What systemic disease may this patient possibly have?
Polyarteritis nodosa
What are the ocular features of polyarteritis nodosa?
- Aterior segment: peripheral ulcerative keratitis, necrotizing scleritis, secondary Sjogren’s syndrome. 2 Posterior segement: retinal artery occulsion, cotton wool spots, choroidal vasculitis, anterior ischemic optic neuropathy.
What is Stocker’s line
It is an iron deposi on the cornea in front of a pterygium
What are some systemic associations of peripheral ulcerative keratitis?
- Rheumatoid arthritis. 2. Wegener’s granulomatosis. 3.Polyarteritis nodosa. 4. Relapsing polychondritis. 5. Systemic lupus erythematosus.
What is a Tzanck prep?
This is a Giemsa stain of corneal scrapings of HSV epithelial infection, revealing multinucleated giant cells.
Do patients with central cloudy corneas of Francois complain of decreased vision?
No. Central cloudy cornea of Francois is bilateral, hereditary, deep, central shagreen that has no effect on vision.
What is the name for the noninflammatory, slowly progressive thinning of the peripheral corneal that begins superiorly and has an associated vascular pannus?
Terrien’s marginal degeneration
What type of astigmatism may develop from Terrien’s marginal degeneration?
“Against-the-rule” astigmatism.
Thinning in the lucid area posterior to corneal arcus is known as what?
Furrow degeneration
What percent of patients with map-dot-fingerprint will have corneal erosions?
10%
What percent of patients with corneal erosions will have map-do-fingerprint?
50%
A 3 day old infant is noted to have progressive corneal edema with vertical posterior striae. What is the most likely cuase of this ocular condition?
Birth trauma (forceps delivery) with rupture of Descemet’s membrane and endothelium.
What are some systemic disorders associated with keratoconus?
- Atopic dermatitis. 2.Down’s syndrome. 3.Marfan’s syndrome. 4.Ehler-Danlos syndrome. 5.Osteogenesis imperfecta 6. Mitral valve prolapse.
What type of hypersensitivity reaction may be invoked in ocular rosacea?
Type IV hypersensitivity.
What stains can be used to identify fungi?
- Gomori Metamine silver stain. 2.Periodic acid-Schiff 3.Giemsa stain
What is blood agar used to culture for?
It is used primarily for isolation of aerobic bacteria and will allow the growth of saprophytic fungi at room temperature.
Which anti-Epstein-Barr virus antibody does not peak during the first 6 to 8 weeks of infection with EBV?
EBNA (Epstein-Barr nuclear antigen).
Which anti-EBV antibodies remain detectable for life after infection with EBV?
EBNA and VCA-IgG
What are other ocular disorders associated with keratoconus?
- Vernal and atopic keratoconjunctivitis. 2.Leber’s congenital amaurosis. 3.Retinitis pigmentosa 4.Aniridia. 5.Ectopia lentis
What do the deposits in spheroidal degeneration represent, and what are they caused by?
Spheroidal degeneration is characterized by golden brown spherules in the superficial corneal stroma. They are proteinaceous material resulting from the combined effects of genetic predisposition, aging, actinic exposure, and environmental trauma.
What are the causes of corneal cloudingin infants?
- Coneal edema (birth trauma, glaucoma). 2. Infectious keratitis (rubella, intersitial, gonococcal). 3. Metabolid abnormalities (mucopolysaccharidoses, mucolipidoses). 4. Dystrophies (endothelial and stromal). 5.Sclerocornea.
What is the appropriate management of malignant melanoma of the conjunctiva?
Excision using a no-touch techinque with care to include 3-4 mm of normal adjacent conjunctiva and double freeze-thaw applications to the surrounding conjunctiva.
What is a Kayser-Fleischer ring?
It consists of copper deposits in Descement’s membrane and is found in Wilson’s disease
What species is responsible for lice infection of the lids (ocular pediculosis)
Phthirus pubis (crab louse).
What is the Ziehl-Neelsen stain used to stain for?
Mycobacteria and Nocardia
What culture medium is used to grow mycobacteria?
Lowenstein-Jensen
What are the causes of band keratopathy?
- Juvenile rheumatoid arthritis. 2.Hereditary band keratopathy. 3. Chronic iridocyclitis in adults 4. Hypercalcemia and hyperphosphatemia 5. Chronic mercurial exposure 6. Congenital ichthyosis 7. Silicone oil in atnerior chamber 8. Phthisis bulbi 9. Idopathic in elderly
How do you remove band keratopathy?
Apply 0.5 mol/L to 0.25 mol/L disodium EDTA solution topically to soften the calcium, then scrape the deposit off. The eye is then patched or a bandage contact lens is applied to allow the epithelium to heal.
What are the anterior segment features of Marfan’s syndrome?
- Bilateral upward lens subluxation. 2. Microspherophakia 3.Blue sclerae 4.Keratoconus 5.Angle anomalies. 6.Hypoplastic dilator pupillae
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Black fly
What are Henderson-Patterson bodies?
They are intracytoplasmic inclusion bodies in the hyperplastic epithelium in umbilicated, nodular lesions caused by molluscum contagiosum. The bodies are small and eosinophilic deep inside the lesion but basophilic and larger near the surface.
What type of polymorphonuclear leukocytes are usually present in the conjunctival epithelium: of patients with vernal conjunctivitis?
Eosinophils
What is the most appropriate surgical management of squamous cell carcinoma of the conjunctiva?
Wide no-touch surgical excision with supplementary cryoablation.
A patient with decompensated Fuch’s dystrophy presents with a well-circumscribed, chalky white infiltrate with overlying ulceration associated with pain, photophobia and tearing for the past 4 days. What is the most likely organism in this case?
Staphylococcus aureus.
What stains can be used to identify the presene of amyloid deposits in the cornea, and what type of reaction do they exhibit?
- Dichroism with Congo Red stain. 2. Metachromasia with crystal violet stain. 3. Fluorescence with thioflavin T.
An alcoholic elderly patient who lives in the streets presents with a nonperforated corneal ulcer for the past week and a half and maceration of the skin at the lateral canthus. What will the gram stain of the corneal scraping likely show?
Large gram negative diplobacilli of Moraxella lacunata.Large gram negative diplobacilli of Moraxella lacunata.Large gram negative diplobacilli of Moraxella lacunata.Large gram negative diplobacilli of Moraxella lacunata.Large gram negative diplobacilli of Moraxella lacunata.Large gram negative diplobacilli of Moraxella lacunata.Large gram negative diplobacilli of Moraxella lacunata.
If Acanthamoeba keratitis is suspected, what type of culture media should be used?
Nonnutrient agar with heat-killed E. coli overlay.
What culture media should be used for the growth of fungi?
Sabouraud’s agar
What condition associated with HLA-DR3 is characterized by recurrent episodes of tearing, foreign body sensation, photophobia, decreased vision, and multiple small corneal epithelial lesions?
Thygeson’s superficial punctate keratitis.
What infectious diseases can cause interstitial keratitis (IK)?
- Syphilis. 2. Tuberculosis. 3. Leprosy. 4. B. burgodorferi 5. Rubeola 6. EBV 7. C. trachomatis. 8. Onchocerca volvulus.1. Syphilis. 2. Tuberculosis. 3. Leprosy. 4. B. burgodorferi 5. Rubeola 6. EBV 7. C. trachomatis. 8. Onchocerca volvulus.1. Syphilis. 2. Tuberculosis. 3. Leprosy. 4. B. burgodorferi 5. Rubeola 6. EBV 7. C. trachomatis. 8. Onchocerca volvulus.1. Syphilis. 2. Tuberculosis. 3. Leprosy. 4. B. burgodorferi 5. Rubeola 6. EBV 7. C. trachomatis. 8. Onchocerca volvulus.1. Syphilis. 2. Tuberculosis. 3. Leprosy. 4. B. burgodorferi 5. Rubeola 6. EBV 7. C. trachomatis. 8. Onchocerca volvulus.1. Syphilis. 2. Tuberculosis. 3. Leprosy. 4. B. burgodorferi 5. Rubeola 6. EBV 7. C. trachomatis. 8. Onchocerca volvulus.1. Syphilis. 2. Tuberculosis. 3. Leprosy. 4. B. burgodorferi 5. Rubeola 6. EBV 7. C. trachomatis. 8. Onchocerca volvulus.
A 44 year-old woman presents with intense eye irritation associated with hypertopic conjunctiva at the supeior limbus with adjacent filamentary keratitis. What is your diagnosis?
Superior limbic keratocnjunctivitis
What systemic disease may be associated with superior limbic keratocnjunctivitis (SLK)?
Thyroid disease in 50% of patients with SLK
What is the treatment for SLK?
In mild cases artifical tears and ointment may be sufficient. In more severe cases, 0.5 to 1 % silber nitrate (in was ampoules, not cautery sticks) applied to the superior bulbar and tarsal conjunctiva for 10-20 seconds. Thermal cautery, pressure patching, or bandage contact lenses may be employed. Conjunctival resection may be necessary.
This is usually a seasonal recurring, bilateral inflammation of the conjunctiva, which occurs most commonly in male children and young adults.
Vernal keratoconjunctivitis
What type of ulcer is associated with vernal?
Shield ulcer
What is used as prophylaxis against seasonal recurrences of vernal?
4% Cromolyn sodium qid started at least one month prior to usual onset of symptoms.
What type of keratoconjunctivitis may be associated with sheild-shaped anterior subcapsular or posterior subcapsular lens opacities?
Atopic keratocnojunctivitis
Whatis a congenital syndrome associated with aqueous tear deficiency (ATD)?
Riley-Day (familial dysautonomia) or Shy-Drager (idiopathic autonomic dysfunction)
What is the most common cause of dacryocystitis in adults? In children?
Pneumococcus and Haemophilus influenza respectivelyPneumococcus and Haemophilus influenza respectivelyPneumococcus and Haemophilus influenza respectivelyPneumococcus and Haemophilus influenza respectivelyPneumococcus and Haemophilus influenza respectivelyPneumococcus and Haemophilus influenza respectively
What is the diagnostic value of Wright’s stain in regards to conjunctivitis?
It is a cytologic stain that highlights eosionphils and their granules - found in hay fever conjunctivitis.
What is a classic slit lamp finding of staphylococcal blepharitis?
Collatrettes
What should always be on the differential of ocular surface inflammation in patients that have been using topical medication?
Medicomentosa - toxic reaction that can occur after long-term use of topical medications
How do the dermoids of epidermal nevus syndrome differ from those of Goldenhar’s syndrome?
They tend to be bilateral and more extensive.
What is the treatment for gonococcal conjunctivitis?
Ceftriaxone 1 gm IM once (or IV). Copious irrigation with normal saline should be instituted. Since concurrent chlamydial infection ahs been reported in a third of patients, supplemental oral antibiotics should be given to treat chlamydia (tetracycline, oxycycline, minocycline, erythromycin, or azithromycin).
What organisms are most commonly associated with phylctenulosis?
Chronic infection with Staphylococcus aureus is the most common cause of phylctenulosis. Tuberculi antigen was most commonly linked to phylctenulosis in the past.Chronic infection with Staphylococcus aureus is the most common cause of phylctenulosis. Tuberculi antigen was most commonly linked to phylctenulosis in the past.Chronic infection with Staphylococcus aureus is the most common cause of phylctenulosis. Tuberculi antigen was most commonly linked to phylctenulosis in the past.Chronic infection with Staphylococcus aureus is the most common cause of phylctenulosis. Tuberculi antigen was most commonly linked to phylctenulosis in the past.Chronic infection with Staphylococcus aureus is the most common cause of phylctenulosis. Tuberculi antigen was most commonly linked to phylctenulosis in the past.Chronic infection with Staphylococcus aureus is the most common cause of phylctenulosis. Tuberculi antigen was most commonly linked to phylctenulosis in the past.
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Sleeving of eyelash bases