What does retroillumination in eye examination primarily detect?

Retroillumination is a technique used during eye examinations where a light source is directed at the back of the eye to visualize and assess various structures. The primary purpose of retroillumination is to detect opacities or defects in the lens, such as cataracts. When the light shines through the lens, any cloudiness or irregularities can be identified as areas that block or scatter the light, indicating the presence of lens opacities.

This method allows for a clear view of how light interacts with the lens and can effectively highlight any abnormalities that may not be easily visible through direct observation alone. By using this technique, eye care professionals can better evaluate the condition of the lens and determine the necessity for further intervention or treatment.