My Notes
Good vision depends on adequate intake of carotene rich food.
Select the best option from the following statements.
I. Vitamin-A derivatives are formed from carotene.
II. The photopigments are embedded in the membrane discs of the inner segment.
III. Retinal is a derivative of vitamin-A.
IV. Retinal is a light absorbing part of all the visual photopigments.
(1) (I) and (II)
(2) (I), (III) and (IV)
(3) (I) and (III)
(4) (II), (III) and (IV)
The point where optic nerve leave and the retinal blood vessels enter it is
(1) A point left to and slightly down the posterior pole of the eyeball
(2) A point medial to and slightly above the posterior pole of eye ball
(3) A point right to and slightly above the posterior pole of eyeball
(4) A point medial to and slightly down the posterior pole of the eyeball
Blind spot is not
(1) Photoreceptor cells are not present in blind spot
(2) Retinal blood vessels enter at that point
(3) Optic nerves leave the eye at this point
(4) Is slightly below the posterior pole of the eyeball.
Yellow spot of eye is
(1) At the posterior pole of the eyeball which is lateral to the blind spot
(2) At the anterior pole of the eyeball which is above to the blind spot
(3) At the anterior pole of the durbal which is lateral the blind spot
(4) At the posterior pole of the eyeball which is below the blind spot
Macula lutea …a...
Fovea…b....
(1) Yellow spot, dark spot
(2) Yellow spot, pit
(3) Pit, yellow spot
(4) Dark spot, pit
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