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To the Editor.
—Since the advent of the first commercially available glare tester in 1983, the market has expanded significantly. The instrument designers are to be commended for attempting to quantify the disparity between indoor vision assessed in a darkened refracting lane and functional outdoor vision; however, it is clear that the entire field of glare testing in patients with cataracts is in a state of evolution. Currently, there are no standards for glare type, illuminance, or target configuration. Accurate documentation of functional visual loss is essential, but existing studies (often conducted by the glare test inventor) that have sought to weigh the relative sensitivity of various instruments may not have been conclusive. There are several important methodological factors to consider when conducting glare studies.
—Studies should include only patients with cataracts who have reasonable visual acuity (better than 20/50). Patients with dense cataracts, and thus further
Prager TC, Urso RG, Lewis JW, Ruiz RS. Methodological Considerations in Glare Testing in Patients With Cataracts. Arch Ophthalmol. 1988;106(11):1501-1502. doi:10.1001/archopht.1988.01060140669005