Which of the following cells are associated with the identification of colours in bright light?
ACone cells
BRod cells
CLacrimal cells
DCells of Muller
Answer:
A. Cone cells
Read Explanation:
- Cone cells are the photoreceptor cells in the retina of the eye responsible for color vision and high spatial acuity.
- They function best in bright light (photopic vision) and are concentrated primarily in the fovea centralis, the central region of the macula.
- There are three types of cone cells, each containing a specific photopigment sensitive to different wavelengths of light, corresponding roughly to red, green, and blue.
- By comparing the signals from these three types of cones, the brain is able to perceive a full spectrum of colors.
- In contrast, rod cells are the photoreceptor cells responsible for vision in low-light conditions (scotopic vision).
- Rod cells are much more sensitive to light than cone cells but do not mediate color vision, which is why color perception is poor in dim light.
- The human retina contains approximately 6 to 7 million cones, compared to about 120 million rods.
- Damage to or genetic deficiencies in these cells lead to various forms of color blindness, such as protanopia (red-blindness), deuteranopia (green-blindness), and tritanopia (blue-blindness).