Age variation in the upper limit of hearing and amplitude of eye accommodation in childhood and adolescence.
The upper limit of hearing and amplitude of eye accommodation were examined, and their standard aging curves were established in order to evaluate their age-related changes in childhood and adolescence. The subjects were 2497 audiometrically and otologically normal ears and 2349 optometrically and ophthalmologically normal eyes ranging in age from 5 to 24 years in Japan. The upper limit of hearing was measured by the equipment made by us. The amplitude of eye accommodation was calculated at near point and far point measured by the ophthalmodynamometer. Both the upper limit of hearing and amplitude of eye accommodation became gradually less as age increased. The variability of the upper limit of hearing was less than that of the amplitude of eye accommodation. Standard aging curves were established in childhood and adolescence by calculating 10th, 25th, 50th, 75th and 90th centiles. There is no significant relationship between the upper limit of hearing and the amplitude of eye accommodation.
Morioka
I
I
Department of Hygiene, Wakayama Medical College, Japan.
Shiraishi
T
T
Nishimura
K
K
Kuroda
M
M
Kuriyama
Y
Y
Matsui
K
K
Matsumoto
K
K
Takeda
S
S
D000065:Accommodation, Ocular; D000293:Adolescent; D000328:Adult; D000375:Aging; D002648:Child; D002675:Child, Preschool; D005260:Female; D006309:Hearing; D006801:Humans; D007564:Japan; D008297:Male; D012737:Sex Factors