Merrill watches his finger with both eyes as he brings it closer to his nose. As the finger gets closer, his eyes move inward and he feels his eye muscles working. Which depth cue(s) is/are associated with the changes made in the shape of the lens as he brings objects into focus?

Accommodation and convergence

Explanation: accommodation and convergence is a depth cue associated with reflex action of the eye, that is, the involuntary movement of the eye in response to a particular stimulus. Accommodation convergence explains the behavior of the eye that is, changes in shape of the lens and size of pupil with respect to the distance of objects from the eye.

As objects get closer to the eye, the eyes move inward and feels like eye muscles are working. When the objects recedes the muscles become relaxed.

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