Cornea

Question 1

Layers of cornea having regenerative capacity

Layers of cornea not having regenerative capacity

Strongest layer of cornea

Most common collagen in

1) sclera
2) cornea
3) vitreous

Answer 1

Epithelium, Descemet’s memb

Bowman’s memb, Stroma, Endothelium

Descemet’s memb or Dua layer

1) I
2) I
3) II

Question 2

Study of corneal

Surface

Thickness

Curvature

Everything

Endothelium

Answer 2

Keratoscopy (placido disc)

Pachymetry

Keratometry

Topography

Specular microscopy

Question 3

Which type of corneal ulcer

1) has ring ulcer
2) has sterile hypopyon
3) has immune ring
4) saucer shaped
5) satellite lesions
6) decreased corneal sensation
7) feathery margin

Answer 3

1) Acanthomeba
2) bacterial corneal ulcer esp Pneumococcal
3) Fungal corneal ulcer ( weesly ring)
4) Bacterial corneal ulcer
5) Fungal corneal ulcer
6) Herpes simplex
7) Fungal ulcer

Question 4

Which type of corneal ulcer

1) ulcer serpens
2) punctate keratopathy
3) dendritic ulcer
4) acute retinal necrosis
5) stromal abscess
6) pseudo dendritic ulcer
7) patchy stromal infiltrate

Answer 4

1) bacterial corneal ulcer especially pneumococcal
2) herpes zoster
3) herpes simplex
4) herpes zoster
5) acanthamoeba
6) herpes zoster, acanthamoeba
7) acanthamoeba

Question 5

Which type of corneal ulcer

1) geographical ulcer
2) stromal necrotic ulcer
3) disciform ulcer
4) associated with iritis/uveitis/ optic neuritis ophthalmoplegia /encephalitis/ meningitis/ hemiplegia
5) metaherpetic/ atrophic ulcer
6) unsterile hypopyon

Answer 5

1) herpes simplex
2) herpes simplex
3) herpes simplex
4) herpes zoster
5) breakdown of previous viral scar
6) fungal corneal ulcer

Question 6

Nerve implicated in hutchinson’s rule

Most prominent feature of

1) bacterial corneal ulcer
2) fungal corneal ulcer
3) viral corneal ulcer
4) acanthamoeba corneal ulcer

Answer 6

Nasociliary nerve

1) Pain
2) signs more than symptoms
3) decreased corneal sensation
4) excruciating pain

Question 7

Most common cause of

1) fungal corneal ulcer
2) corneal ulcer in contact lens users

Bacteria that can invade intact cornea

Answer 7

1) aspergillus
2) pseudomonas> acanthamoeba

Haemophilus influenzae
Nisseria meningitidis and gonorrhea
Cornebacterium diptherae
Listeria

Question 8

Cogan syndrome

Triad of congenital syphilis

Triad of congenital rubella

Appearance of cornea in interstitial keratitis

Answer 8

Interstitial keratitis+ deafness

INH 
interstitial keratitis (Salmon patch & ghost vessel appearance) + SNHL + Hutchinson's teeth

CHD
Congenital cataract+ heart disease (PDA) + SNHL

Ground glass

Question 9

Corneal dystrophy vs degeneration

Answer 9

Dystrophy. Degeneration

Hereditary. Acquired

B/L. B/L or U/L or symm or asymm

Not ass with ass with systemic d/s
Systemic d/s

Question 10

Examples of

Anterior corneal dystrophies

Stromal corneal dystrophies

Posterior corneal dystrophies

Answer 10

Epithelial- cogans, Messman
Bowman’s memb- Reis buckler, Theil Bhenke

Stromal-
Macular, Mucopolysaccharides, Alcain blue
Granular, Hyaline, Masson trichome
Lattice- Amyloid, Congo red
Avellino- granular + lattice

Posterior (endothelial)
Fuchs endothelial dystrophy
Congenital hereditary endothelial dystrophy
Posterior polymorphus dystrophy

Question 11

Most common corneal dystrophy

Least common corneal dystrophy

Most common corneal dystrophy requiring corneal transplantation

Answer 11

Cogans

Macular

Fuchs

Question 12

Feature of cogans distrophy

Features of Fuchs endothelial dystrophy

Answer 12

Map dot / Thumb print dystrophy

Corneal edema, bullous keratopathy, more in morning after waking up,
CORNEAL GUTTATE

Question 13

Examples of corneal degeneration

Answer 13

Arcus senilis

Arcus juvenilis

Band shaped keratopathy

Corneal dallen

Question 14

Band shaped keratopathy

Which mineral deposit

At which layer of cornea deposited

Treatment

Answer 14

Ca

Bowman’s memb

Epithelial debridement and chelation with EDTA

Question 15

Keratoconus

1) number of eyes involved
2) size of eyeball
3) curvature of cornea
4) refractive errors
5) finding in retinoscopy
6) finding in distant direct ophthalmoscopy
7) finding in applanation tonometry
8) stretch marks?, direction?
9) clinical sign
10) mineral deposited
11) acute complication

Answer 15

1) B/L
2) increase
3) increase
4) myopia, irregular astigmatism
5) scissoring reflex/yawning reflex
6) oil droplet reflex
7) pulsatile mires
8) Vogt stria, vertical
9) Munsen sign, Fleisher ring
10) Fe
11) Corneal hydrops, painful, rupture of endothelium

Question 16

Examples of partial thickness corneal transplantation

Examples of full-thickness transplantation

Most common complication after keratoplasty

Sign of graft rejection after keratoplasty

Answer 16

Lamellar,
Anterior- DALK (procedure of choice)
Posterior- DESK

Penetrating keratoplasty

Astigmatism

Khodadost line in endothelium