title: [The strategy of determining the customized near addition lens for juvenile esophoric myopes].
abstract: 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.
authors.affiliation: Zhongshan Ophthalmic Center, Sun Yat-Sen University, the Key State Laboratory of Ophthalmology, Guangzhou 510060, China.
authors.forename: Dong-mei
authors.initials: DM
authors.lastname: Wang
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Wei-zhong
authors.initials: WZ
authors.lastname: Lan
authors.forename: Xiao-wei
authors.initials: XW
authors.lastname: Zhu
authors.forename: Zhen
authors.initials: Z
authors.lastname: Li
authors.forename: Feng
authors.initials: F
authors.lastname: Zhao
authors.forename: Zhi-kuan
authors.initials: ZK
authors.lastname: Yang
mesh_terms: 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*