MCQ’s in Optometry | Cornea

MCQ’s in Optometry | Cornea | Part 27

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1. True about cornea:
A. Power is 43 D
B. Majority of refraction occur at air-tear interface
C. With the rule astigmatism is present because
vertical meridian more sleep than horizontal meridian
D. Spherical structure
2. Corneal transparency is maintained by all except:
A. Relative dehydration
B. Increased mitotic figures in centre of cornea
C. Unmyelinated nerve fibers
D. Uniform spacing of collagen fibrils
3. Ionic pump in corneal endothelium is necessary for maintaining deturgescence of the cornea and thus transparency. It can be blocked by:
A. Inhibition of anaerobic glycolysis
B. Activation of anaerobic glycolysis
C. Inhibition of Kreb’s cycle
D. Inhibition of HMP pathway
4. A young man aged 30 years, presents with difficulty in vision in the left eye for the last 10 days. He is a rural community and gives history of trauma to his left eye with vegetative matter 10-15 days back. On examination, there is an ulcerative lesion in the cornea, whose base has raised soft creamy infiltrate. Ulcer margin is feathery and hyphate. There are a few satellite lesions also. The most probable etiological agent
is:
A. Acanthamoeba
B. Corynebacterium diphtheria
C. Fusarium
D. Streptococcus pneumonia
5. Kallu, a 25 year male patient presented with a red eye and complains of pain, photophobia, watering and blurred vision. He gives a history of trauma to his eye with a vegetable matter. Corneal examination shows a dendritic ulcer. A corneal scraping was taken and examined. Microscopy showed macrophages like cells on culturing the corneal scrapings over a nonnutrient agar enriched with E.coli, there were plaque formations. Which organism is most likely:
A. Herpes simplex
B. Acanthameba
C. Candida
D. Adeno virus
6. Corneal dystrophies are usually:
A. Primarily unilateral
B. Primarily bilateral
C. Primarily unilateral without systemic disease
D. Primarily bilateral with systemic disease
7. Corneal dystrophies are:
A. Macular
B. Granular
C. Lattice
D. Moorens
8. Which of the following is the least common corneal dystrophy:
A. Macular dystrophy
B. Lattice type I
C. Lattice type III
D. Granular corneal dystrophy
9. Corneal vascularisation is/are caused by:
A. Graft rejection
B. Chemical burn
C. Contact lens use
D. Vitreous haemorrhage
10. The central nebular corneal opacity is easily
treated with:
A. Lamellar keratoplasty
B. Penetrating keratoplasty
C. Gas permeable contact lens
D. Soft contact lens
11. Pigment deposition on cornea seen in:
A. Chloroquine
B. Digoxin
C. Ranitidine
D. Amiodarone.
12. Corneal transplantation:
A. Donor is more than 60 years not allowed
B. Whole eye preserved in culture
C. Specular microscopy done for corneal endothelial count
D. HLA matching required
13. Corneal tattooing is done by:
A. Iron
B. Silver
C. Copper
D. Platinum
14. Neuroparalytic keratitis is due to which cranial nerve:
A. 3rd nerve
B. 5th nerve
C. 6th nerve
D. 7th nerve
Now, Question for the viewers
Corneal tattooing is done by:
A. Iron
B. Silver
C. Copper
D. Platinum
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