老视 meaning in English

presbyopia; presbytism; presbytia; old sight

Firstly , various kinds of presbyopia lenses is reviewed and compared . the basic feature and principle of the pal are introduced and the difference between the characteristics of hard design and soft design is described as well
首先，概述和比较不同的老视矫正镜片，介绍渐变镜片的基本结构特征和矫正原理，比较分析软设计和硬设计之间的区别。
Progressive addition lenses ( pal ) is a new kind of effective solution to presbyopia , it has many advantages over other lenses dealing with presbyopia . investigation of its design and evaluation method is shown in this dissertation
渐变镜片(英文progressiveadditionlenses简称pal )是针对老视症状的一种有效的解决手段，与各类传统老视镜片相比较具有许多优点，本文对这种镜片的设计和评价进行研究。