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23 Cards in this Set
- Front
- Back
5 layers of cornea
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1. epithelium
2. bowmans layer 3. stroma 4. descement's membrane 5. endothelium |
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fluorescein stain
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location of corneal lesion
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(peripheral: indirect viral infection, no microorganisms present)
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hypopyon- pus in anterior cavity
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3 commonest bacterial ulceration of cornea
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1. strep pneumonia
2. pseudomonas 3. staph aureus & epidermidis |
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fungal keratitis
-hx plant/ animal matter -extremely red& inflammed -*satellite lesions -hypopion - progress slowly |
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primary herpes simplex keratoconjunctivits
-children and young adults -mild malaise - *vesicular skin rash on eyelids |
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dendritic ulcer dt recurrent herpes simplex keratitis
enlarges= geographic ulcer |
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herpes simplex keratitis
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reduced corneal sensation
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complications of herpes simplex keratitis
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1. disciform keratitis
2. stromal keratitis |
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disciform keratitis
-round, dull central area of corneal oedema dt immune response |
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Huchinson's sign
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appearance of typical lesions at tip, side, root of nose
*strong prognostic indicator of ocular involvement of herpes zoster |
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herpes zoster ophalmicus
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marginal infiltrates of cornea
whitish oval/ linear opacities adjacent to limbus lead to ulceration/ vascularisation |
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phlyctenulosis
delayed hypersensitivity response to bacterial antigens *TB - staphylococcal antigens |
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vit A deficiency
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XEROPHTHALMIA
- loss of mucus secreting goblet cells- dry eyes - keratinisation- dull cornea - softening, necrosis and perforation of cornea - night blindness |
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tarsorrhaphy
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surgical partial closure of eyelids
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lagophthalmos
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eyelids don't close completely
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corneal flash burn (arc eye)
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UV irradiation burn cornea
- welding without visor - tanning without eye shields |
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arcus cornealis
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haematocornea
- hyphaema stains cornea with Hb |
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ectatic corneal dystrophy
- myopia - astigmatism |
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Munson's sign
- look down, conic shapr thrusts center of lower lid margin forwards |