Which description matches the function of the iris?

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Multiple Choice

Which description matches the function of the iris?

Explanation:
The iris regulates how much light enters the eye by changing the size of the pupil. Its muscles tighten or relax to make the pupil smaller in bright light and larger in dim light, directly controlling the amount of light that reaches the retina. This is why the option describing light entering the eye matches best. The other ideas pertain to memory processing, perceptual thresholds, or decision-making under uncertainty and are not functions of the iris.

The iris regulates how much light enters the eye by changing the size of the pupil. Its muscles tighten or relax to make the pupil smaller in bright light and larger in dim light, directly controlling the amount of light that reaches the retina. This is why the option describing light entering the eye matches best. The other ideas pertain to memory processing, perceptual thresholds, or decision-making under uncertainty and are not functions of the iris.

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