No image formation occurs on blind-spot of retina
because
(a) it is not present on the optical axis of the eye
(b) here cones and rods are absent
(c) on this part only cones are present
(d) the nerve fibres of this region do not
contribute in the formation of optic chiasma
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No image formation occurs on blind-spot of the retina because:
(b) here cones and rods are absent
- The blood vessels and optic nerve leaves the eye at the blind spot
- It does not consist of any photorecptors, i.e. cones and rods.
- Due to this reason, there is no image detection on the blind spot.
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No image formation occurs on blind-spot of retina because here cones and rods are absent.
Option (B) is correct.
Explanation:
- The small portion of the visual field of each eye is called the blind spot.
- It corresponds to the position of the optic disk within the retina.
- In the optic disk there are no photo-receptors that is rods or cones.
- Therefore, image detection in impossible in this region.
- The blind spot of the left eye is located to the left of the centre of vision and vice versa.
- When both eyes are open, It is impossible to detect the blind spots, because the visual fields of the two eyes overlap.
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