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Ophthalmology

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Refraction and Optics

Question
7 out of 41
 

The most important factor determining convergence of light rays on the retina is (AIIMS May 2012)



A Length of the eyeball

B Dioptre power of the lens

C Curvature of the cornea

D Physical state of the vitreous

Ans. C [Curvature of the cornea] Q

Cornea:

Tropicamide-Only mydriatic ; no cycloplegic action

Keratoconus-Increased corned curvocture-Curvatural

1. *The cornea is richly supplied by sensory nerve ending Q via the first division of the trigeminal nerve.

2. Centre of the cornea is more sensitive.

3. *Cornea is not vascularized, Q it derives nourishment mainly from aqueous humour.

a. Surface irregularities can be detected by examining the corneal reflex - Placido'sdisc

b. Measurement of curvature is done by keratometry and corneal topography.

c. *Corneal thickness measured by pachymetry.

Refraction and Optics Flashcard List

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