Photorefraction: a technique for study of refractive state at a distance.
D000065:Accommodation, Ocular; D000293:Adolescent; D000328:Adult; D001251:Astigmatism / Q000175:diagnosis; D002675:Child, Preschool; D003720:Densitometry; D005336:Fiber Optic Technology; D005403:Fixation, Ocular; D006801:Humans; D006956:Hyperopia / Q000175:diagnosis; D008875:Middle Aged; D009216:Myopia / Q000175:diagnosis; D009907:Optometry / Q000295:instrumentation*; D010781:Photography; D011305:Presbyopia / Q000175:diagnosis; D012025:Reflex, Pupillary; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000175:diagnosis*; D012160:Retina