title: [Subjective free-vision determination of refraction with the opto-refractor].
abstract: The optorefraktor is an instrument for determining refraction subjectively with free vision, and is used for monocular prerefraction. Aphakic and pseudoaphakic patients, who represent a difficult group for a subjective examination because of their often very low visual acuity and dilated pupils, were examined with this instrument. The prerefraction values determined with the optorefractor were compared with the values obtained using a phorometer. It was found that the optorefractor is just as suitable for prerefraction as other well-known and sometimes very costly devices and techniques for objective prerefraction.
mesh_terms: D000065:Accommodation, Ocular; D002387:Cataract Extraction; D006801:Humans; D007910:Lenses, Intraocular; D009216:Myopia / Q000175:diagnosis; D009885:Ophthalmology / Q000295:instrumentation*; D055095:Optics and Photonics; D011183:Postoperative Complications / Q000175:diagnosis; D012029:Refraction, Ocular
vernacular_title: Zur freisichtigen subjektiven Refraktionsbestimmung mit dem Optorefraktor.