[The strategy of determining the customized near addition lens for juvenile esophoric myopes].
OBJECTIVE
To discuss accommodative lag and near phoria varying with the near addition lenses and establish the mathematic equations of near adds and accommodative lag, near phoria respectively in order to getting the optimal adds, which would create the least error in accommodative and convergence responses.


METHODS
To measure accommodative lag by Shin-Nippon and near phoria by Cover Test in 33 cm after providing 0D, +0.75D, +1.50D, +2.00D, +2.50D five near adds orderly to myopes after 110 simple myopes with esophoria have been corrected far vision wholly basing on MPMVA norm; to analyze the relation of near adds and accommodative lag, near phoria by linearity regression.


RESULTS
While increasing dioptric value of the near adds, accommodative lag and esophoria decrease gradually. Both accommodative lag [F(262.76, 4), P < 0.01]and near phoria [F(223.45, 4), P < 0.01] show statistically significant difference among the five near adds. There is linearity correlation between the optimal adds and initial accommodative lag (r = 0.526, P < 0.01) and between the optimal adds and initial near phoria (r = 0.523, P < 0.01).


CONCLUSIONS
The range of optimal near adds can be gotten basing on initial accommodative lag and near phoria of myopic individual, so that it can be provided referenced strategy of determining the customized near addition lens for juvenile esophoric myopes.
Wang
Dong-mei
DM
Zhongshan Ophthalmic Center, Sun Yat-Sen University, the Key State Laboratory of Ophthalmology, Guangzhou 510060, China.
Wang
Ping
P
Lan
Wei-zhong
WZ
Zhu
Xiao-wei
XW
Li
Zhen
Z
Zhao
Feng
F
Yang
Zhi-kuan
ZK
D000065:Accommodation, Ocular / Q000502:physiology; D002648:Child; D004948:Esotropia / Q000150:complications / Q000628:therapy*; D005139:Eyeglasses; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000150:complications / Q000628:therapy*