In the human eye, the 'macula lutea' and its central depression, the 'fovea centralis', are significant because the fovea contains:
A. Only rods, providing high sensitivity to dim light
B. Only cones, providing the sharpest central vision and color discrimination
C. An equal number of rods and cones
D. The blind spot where the optic nerve exits
Answer: Option B
Solution (By JKSSB Mock Tests)
The macula lutea is a yellowish spot near the center of the retina. Its central depression, the fovea centralis, is the point of sharpest vision. The fovea is packed exclusively with cone cells and lacks blood vessels and rods. This high density of cones, combined with the displacement of overlying retinal layers, allows for maximum visual acuity and color discrimination in bright light. The blind spot is the optic disc.
No comments yet. Be the first to start the discussion!