A fluorescein angiogram is used for which of the following?

A fluorescein angiogram is specifically designed to visualize the blood flow in the retina and to identify any abnormalities in the blood vessels of the eye. During this procedure, a fluorescent dye is injected into the bloodstream, and a specialized camera captures images of the retina. This allows for detailed examination of the fundus, where any blockages, leaks, or other vascular issues can be clearly observed.

This technique is particularly useful in diagnosing and monitoring various eye conditions such as diabetic retinopathy, macular degeneration, and retinal vein occlusion, all of which can involve changes in the blood vessels of the retina. By showing the detailed vascular structures, fluorescein angiography helps clinicians determine the best course of treatment.

The other options, such as counting epithelial cells, measuring the eye's contrast sensitivity, or estimating the cornea's ability to withstand surgical stress, are unrelated to the purpose of a fluorescein angiogram. These functions are associated with different types of diagnostic tests and evaluations in ophthalmology but do not provide the same insights into the retinal blood vessels as fluorescein angiography does.