Which process refers to the change in sensitivity to different levels of light?

The correct answer is adaptation, which is a process that describes how the human eye adjusts its sensitivity to varying levels of light. For instance, when moving from a brightly lit environment to a darker one, the eyes gradually become more sensitive to the lower levels of light, allowing a person to see better in dark conditions. This adjustment in sensitivity takes time and is crucial for effective vision in changing light environments.

In contrast, accommodation refers to the eye's ability to focus on objects at different distances by altering the shape of the lens. Adjustment is a more general term and does not specifically pertain to sensitivity to light. Transduction is the process through which sensory stimuli are converted into electrical signals that the brain can interpret, but it does not deal specifically with changes in sensitivity to light levels.