Effects of sustained deprivation of far sight on human near point of convergence and near point of accommodation

Abstract

Objective To study effects of sustained deprivation of far sight on human near point of convergence (NPC) and near point of accommodation (NPA). Methods Eight subjects were divided into two groups by age (group A ≥30 years old; group B 0.05). Conclusions Sustained deprivation of far sight could induce an increase in NPC values to various degreeal, but effects on NPA were not obvious, as noted in our experiment. Key words: Near point of convergence; Near point of accommodation; Visual fatigue