Visual load.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001248:Asthenopia / Q000209:etiology* / Q000517:prevention & control; D002648:Child; D006801:Humans; D008029:Lighting; D008606:Mental Processes; D008875:Middle Aged; D009787:Occupational Medicine; D055095:Optics and Photonics; D014787:Vision Tests; D014785:Vision, Ocular