Studies of spatial summation of central retinal areas in normal people of all ages.
D000221:Adaptation, Ocular; D000328:Adult; D000367:Age Factors; D000368:Aged; D006801:Humans; D008722:Methods; D008875:Middle Aged; D012160:Retina / Q000502:physiology* / Q000503:physiopathology; D014787:Vision Tests; D014792:Visual Acuity; D058609:Visual Field Tests