title: The effect of cycloplegia on the determination of refractive error by the Ophthalmetron.
abstract: The Ophthalmetron was used to measure the refractive error of 10 male optometry students. Although there was a high incidence of invalid readings, more repeatable results were obtained with use of a cycloplegic. Measurements made under cycloplegia revealed 0.41 D more hyperopia but no differences in astigmatism as compared to the noncycloplegic refraction. Instrument myopia was shown not to be a factor.
mesh_terms: D000065:Accommodation, Ocular / Q000187:drug effects*; D000328:Adult; D003519:Cyclopentolate; D006801:Humans; D008297:Male; D008722:Methods; D009216:Myopia / Q000209:etiology; D009907:Optometry / Q000295:instrumentation*; D010648:Phenylacetates; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000175:diagnosis*
chemical_list: D010648:Phenylacetates; D003519:Cyclopentolate