Visual loss in keratoconus.
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007640:Keratoconus / Q000175:diagnosis*; D008297:Male; D012030:Refractive Errors / Q000175:diagnosis*; D012684:Sensory Thresholds; D014787:Vision Tests / Q000379:methods*; D014792:Visual Acuity