title: The effect of a 550 nm cutoff filter on the vision of cataract patients.
abstract: The effect on visual function of an optical filter which absorbs essentially all visible wavelengths below 550 nm has been studied in a group of patients with moderate stage cataracts. Using a Snellen-type visual acuity chart with a blue background and orange letters, under both glare and non-glare conditions, the visual acuity of these patients was determined. Improvement in acuity was more striking under glare conditions than under standard (non-glare) conditions; in the former case it reached levels as high as 300% in a few patients. The level of the improvement seemed to be related both to cataract type and stage of cataract progression.
mesh_terms: D002386:Cataract / Q000150:complications*; D005139:Eyeglasses; D006801:Humans; D014786:Vision Disorders / Q000209:etiology / Q000628:therapy*; D014787:Vision Tests; D014792:Visual Acuity