MCQ - Physiology of Eye and Vision

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1. Does not form the refractive media of eye:
A. Tear film
B. Cornea
C. Crystalline lens
D. Fovea Centralis

2. Phototransduction refers to:
A. Initiation of vision
B. Processing of vision
C. Transmission of visual sensation
D. Visual perception

3. Is not true about rhodopsin:
A. Present in the rods
B. Consists of opsin and 11-cis retinal
C. Maximum absorption spectrum is around 250 nm
D. Is bleached by light

4. Visual cycle refers to:
A. Alternate distance and near fixation
B. Day vision and colour vision
C. Phorodecomposition and regeneration of visual pigments
D. Cycle of night vision and colour vision

5. Process of visual adaptation refers to:
A. Dark adaptation
B. Light adaptation
C. Dark and light adaptation
D. Dark. light and colour adaptation

6. The faculty of vision does not includes:
A. Form sense
B. Light sense
C. Contrast sense
D. Colour sense
E. Visual evoked potential

7. Relative state of dehydration of cornea is maintained by:
A. Peculiar arrangement of corneal lamellae
B. Avascularity of cornea
C. Active Na+ K+ ATPase pump of the corneal endothelium
D. All of the above.

8. Most toxic agent to cause oxidative damage to
crystalline lens is:
A. Superoxide anion
B. Hydrogen peroxide
C. Lipid peroxide
D. Lipid hydroperoxides

9. Pathway of glucose metabolism which plays important role in galactosemic cataract is:
A. Glycolytic pathway
B. Pentose, Hexose, Monophosphate shunt
C. Kreb's citric acid cycle
D. Sorbitoi pathway

10. Composition of aqueous humour is similar to plasma except that it has:
A. High concentration of bicarbonate
B. Low concentration of bicarbonate
C. Low concentration of pyruvate
D. High concentration of glucose

11 . Active secretion of substances during aqueous formation is dependent on:
A. Calcium and voltage-gated ion channels
B. Level of blood pressure in the ciliary capillaries
C. Plasma osmotic pressure
D. Level of intraocular pressure

12. Most accepted theory for aqueous transport across the inner wall of Schlemm's canal is:
A. Vacuolation theory
B. Aqueous outflow pump mechanism
C. Leaky pores in endothelial cells forming the inner wall of Schlemm's canal
D. Sondermann's channels

13. True for diurnal variation of intraocular pressure (IOP) is:
A. IOP is usually higher in the morning hours
B. IOP is usually low in the morning hours
C. IOP variation is related to plasma acetylcholine level
D. In normal eye lOP fluctuation is more than 10 mm of Hg.

14. True about tears except:
A. Lacus lacrimalis refers to tear collection at medial canthus
B. 50% of tears is drained by inferior canaliculus
C. Tear drainage is on active process
D. Fibres of orbicularis muscle constitute lacrimal pump mechanism

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