Disorders of the Lens Practice Test 2026 - Free Eye Disorders Practice Questions and Study Guide

Posterior luxation means the lens has moved toward the back of the eye, behind the iris. This backward shift changes the alignment of the iris and lens and often alters the gaze, producing a downward-turned appearance of the eyes in which the sclera becomes more visible above the iris. That characteristic “setting sun” look—where the eyes appear driven downward—is a classic external clue of posterior lens dislocation. Other signs listed, like cloudy cornea or discharge with redness, point to corneal edema or inflammation rather than a lens displacement, and a lens in the front of the eye would indicate anterior luxation with different findings. Therefore, the setting sun appearance best matches posterior luxation.