title: Bioptic low vision aid: a simple approach.
abstract: This report describes the design of a variable focus telescopic system for a low vision patient who wanted to be able to see at numerous fixed working distances. A simple and effective means of mounting the telescope onto an existing spectacle lens is described. The discussion presents an analysis of the optical principles used and a formula for determining the equivalent power of a nearpoint telescope.
mesh_terms: D000328:Adult; D003930:Diabetic Retinopathy / Q000150:complications; D005139:Eyeglasses / Q000592:standards*; D006801:Humans; D007909:Lenses / Q000592:standards*; D008297:Male; D014786:Vision Disorders / Q000209:etiology / Q000628:therapy*