Galilean telescopic system for the partially sighted. New application of the Fresnel lens.
D000328:Adult; D002387:Cataract Extraction; D003261:Contact Lenses / Q000379:methods*; D006801:Humans; D007909:Lenses; D008297:Male; D055095:Optics and Photonics; D012029:Refraction, Ocular; D012163:Retinal Detachment / Q000601:surgery; D014786:Vision Disorders / Q000628:therapy; D014794:Visual Fields