A fluorescein angiogram is primarily used for what purpose?

A fluorescein angiogram is primarily used for viewing detail, such as blockages in the fundus blood vessels. This diagnostic procedure involves the injection of a fluorescent dye into the bloodstream, which helps in visualizing the blood vessels in the retina and choroid. By capturing a series of photographs as the dye travels through these vessels, healthcare professionals can identify issues such as retinal vascular occlusions, diabetic retinopathy, and other conditions that may affect blood flow in the eye.

The other options presented refer to different ophthalmic assessment techniques. Measuring intraocular pressure involves tonometry and is essential for diagnosing conditions like glaucoma. Determining lens power is typically accomplished through refractive assessments or keratometry, essential for prescribing corrective lenses. Assessing corneal thickness involves pachymetry, which helps in evaluating corneal health and suitability for procedures such as LASIK. Each of these techniques serves distinct purposes in the realm of eye care, but none are intended for the detailed vascular assessment that fluorescein angiography provides.