It is especially useful for the following: Identifying corneal foreign bodies, abrasions, and other corneal disorders Measuring depth of the anterior chamber Detecting cells (RBCs or WBCs) and flare (evidence of protein) in the anterior chamber Identifying the location and degree of lens opacities (cataracts) Identifying diseases such as macular degeneration, diabetic eye disease, epiretinal membranes, macular edema, and retinal tears (when using a condensing lens) Tonometry and gonioscopy, which quantifies the iridocorneal angle and requires the use of a special lens, may be done.