What procedure is used to assess lens opacity?

The slit lamp examination is an essential procedure for evaluating lens opacity, commonly referred to as cataracts. This technique utilizes a specialized microscope with a bright light source to provide a magnified view of the eye’s anterior structures, including the cornea, iris, and lens. During the examination, the healthcare provider is able to observe any cloudiness or opacities in the lens, which are indicative of cataracts. This detailed view allows the clinician to not only assess the presence of lens opacity but also to evaluate its severity and potential impact on vision.

The other procedures mentioned serve different purposes. Fundus photography is primarily used for imaging the retina and optic nerve, while tonometry is designed to measure intraocular pressure to assess for glaucoma. Perimetry is a test for visual field defects and doesn't provide information about lens clarity. Thus, the slit lamp examination is the most appropriate and effective method for assessing lens opacity.