Which of the following plays an important role in regulating the amount of light entering into the eye?

Correct option is B

The pupil plays a critical role in regulating the amount of light entering the eye.

Explanation:
● The pupil is the opening in the center of the iris, which adjusts its size depending on the brightness of the environment.
● In bright light, the pupil contracts (miosis) to reduce light entry, and in dim light, it dilates (mydriasis) to allow more light.
● This dynamic adjustment protects the retina from damage and optimizes vision.

Information Booster:
● The iris controls the size of the pupil and thus indirectly regulates light entry.
● The cornea and crystalline lens focus light onto the retina but do not control light entry.
● Proper pupil function is vital for clear and comfortable vision.

Additional Information:

• (A) Cornea: Focuses light but does not regulate its amount.
• (C) Crystalline lens: Helps focus light but does not adjust its entry.
• (D) Sclera: Protects the eye but has no role in light regulation.