a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45 同义词：farsightedness,
Presbyopia is a condition where with age, the eye exhibits a progressively diminished ability to focus on near objects. Presbyopia’s exact mechanisms are not known with certainty; the research evidence most strongly supports a loss of elasticity of the crystalline lens, although changes in the lens’s curvature from continual growth and loss of power of the ciliary muscles (the muscles that bend and straighten the lens) have also been postulated as its cause.
例句与用法
1.
Check for presbyopia , and wear suitable lens 怀疑有老花就应检查，及配戴适当的眼镜
2.
Impaired vision due to presbyopia ( usually correctable by lens ) 可能显示疾病的问题(应寻求治疗)
3.
Put in the counter , hang in the picture frame on the wall , what the tea table glass is pressed is all stamps , let us see the presbyopia unexpectedly 柜台里摆的，墙上镜框里挂的，茶几玻璃下压的都是邮票，竟让我们一下看花了眼。
4.
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。
5.
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。
6.
Professor dennis s . c . lam added , " although seem relatively safe , atropine therapy may have long - term side effects arising from paralysis of accommodation ( leading to pre - senile presbyopia ) and pupil dilatation ( leading to ultraviolet light damage to the lens and retina ) 林顺潮教授指出：虽然使用阿托品治疗看来是安全的，但长远而言，亦有可能出现副作用，例如调节麻痹(导致提早出现老花)及瞳孔扩大(导致晶状体及视网膜受到紫外光损害)等。
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