Question

Match the following and choose the correct option.

	Column I		Column II
A	Fovea	1	Provides opening for entry of light
B	Iris	2	Maximum visual acuity
C	Pupil	3	Transmits information to CNS
D	Lens	4	Controls amount of light entering
E	Optic nerve	5	Focuses light on the retina

• A. (A)- 4, (B)- 1, (C)- 5, (D)- 2, (E)- 3
• B. (A)- (5), (B)- (1), (C)- (4), (D)- (3), (E)- (2)
• C. (A)- (3), (B)- (1), (C)- (4), (D)- (5), (E)- (2)
• D. (A)- (1), (B)- (2), (C)- (3), (D)- (4), (E)- (5)
• E. (A)- (2), (B)- (4), (C)- (1), (D)- (5), (E)- (3)

Answer 1

The correct option is E (A)- (2), (B)- (4), (C)- (1), (D)- (5), (E)- (3)

The fovea centralis is the central portion of the human retina, that has the most acute vision and the best color perception. The cones have 3 types of specific photopigments - red, green and blue, or RGB. Most of the color sensitive cones are packed in the fovea centralis.
The colored part of the eye is called as the iris. It controls light levels inside the eye similar to the aperture on a camera. The round opening in the center of the iris is called as the pupil. The iris is embedded with tiny muscles, that dilate (widen) and constrict (narrow) the pupil size.
The lens, by changing shape, functions to change the focal distance of the eye, so that it can focus on objects at various distances, thus allowing a sharp real image of the object of interest to be formed on the retina, which is then transmitted to the brain by the optical nerve.