Question

A person with defective rods will have trouble?

A) seeing well in the dark

B)distinguishing between colors

c) distinguishing shapes at the periphery of the visual field

d) focusing on close objects

e) A and C

Answer 1

Ans:- e)both A and C

Rods are photoreceptor cells which are present in retina:-

They mainly have two function

I) they are more sensitive then cones so they can detect very low light intensity also. Hence helpfull in dim light vision

ii)  Rods are usually found concentrated at the outer edges of the retina and are used in peripheral vision.

So when rods are defective both dark vision and periferal vision are effected.