Astigmatism--its components and their changes with age.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D001251:Astigmatism / Q000503:physiopathology*; D002648:Child; D002675:Child, Preschool; D003315:Cornea / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged; D013223:Statistics as Topic