The lightness discrimination test.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003117:Color Vision Defects / Q000175:diagnosis; D005128:Eye Diseases / Q000175:diagnosis; D006801:Humans; D008027:Light; D008875:Middle Aged; D014787:Vision Tests / Q000379:methods*; D014792:Visual Acuity; D014796:Visual Perception