develop presbyopia
develop 与 presbyopia 搭配表示“出现老花”；presbyopia 是不可数名词，通常不加冠词，也没有常用复数。
Most people develop presbyopia after the age of forty.
大多数人在四十岁以后会出现老花眼。
老花眼；老视
因衰老导致的眼睛无法聚焦于近处物体。；因45岁后晶状体弹性减弱,聚焦近处物体的能力下降；老花眼；[医] 老视
The inability of the eye, due to ageing, to focus on nearby objects.
因衰老导致的眼睛无法聚焦于近处物体。
Inability of the eye, due to ageing, to focus on nearby objects.
因45岁后晶状体弹性减弱,聚焦近处物体的能力下降
a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45
My father started wearing reading glasses when he developed presbyopia in his mid-40s.
我父亲在45岁左右出现老花眼后开始戴老花镜。
用法提示：指因老花眼导致看近物困难，需佩戴眼镜。
Presbyopia is a common condition that typically becomes noticeable after age 40.
老花眼是一种常见情况，通常在40岁后变得明显。
用法提示：用作名词，描述一种与年龄相关的眼部状况。
She found herself holding books at arm's length to compensate for her presbyopia.
她发现自己把书拿到一臂远以弥补老花眼。
用法提示：指通过调整距离来应对老花眼引起的聚焦困难。
develop 与 presbyopia 搭配表示“出现老花”；presbyopia 是不可数名词，通常不加冠词，也没有常用复数。
Most people develop presbyopia after the age of forty.
大多数人在四十岁以后会出现老花眼。
用于说明老花眼带来的具体不便；it 是形式宾语，真正的宾语是后面的不定式。
Presbyopia makes it difficult to read small print.
老花眼使阅读小字变得困难。
onset 指老花眼开始发生的阶段，这个短语多作主语或介词宾语。
Vision changes often begin with the onset of presbyopia.
视力变化往往始于老花眼的出现。
grammar · medium
易错句子My grandfather is a presbyopia, so he needs reading glasses.
正确表达My grandfather has presbyopia, so he needs reading glasses.
presbyopia 是“老视”这一状况的名称，不能用来指人；指人要用 a presbyope 或说 He is presbyopic。表示某人患有某种状况时，英语用 have + 状况名词，所以这里要把 is a 改成 has。
grammar · medium
易错句子She has a presbyopia.
正确表达She has presbyopia.
presbyopia 表示“老视”这一生理状况，属不可数用法，前面不加不定冠词 a/an；表示“患有老视”直接说 have presbyopia，类似 have myopia。
grammar · medium
易错句子Presbyopia makes it hard to see things far away.
正确表达Presbyopia makes it hard to see things close up.
presbyopia 指因晶状体弹性下降导致看近处物体聚焦困难，问题出在看近处而不是看远处；看远处困难是 myopia（近视），两者不能混用。
presbyopia 指因衰老（通常45岁后）晶状体弹性下降导致看近处困难，与年龄相关；hyperopia 是屈光性远视，多因眼球前后径过短，任何年龄都可存在，看远通常清晰、看近费力。两者都影响看近，但成因和是否与衰老绑定不同。
presbyopia 是看近处模糊的衰老现象；myopia 是看远处模糊的屈光不正，通常因眼轴过长。二者焦点问题方向相反，不能互换。
presbyopia 与 presbycusis 都以 presby- 开头、都指衰老相关功能衰退，但前者是视力（看近困难），后者是听力（老年性听力下降）。词形相近，语义分属眼与耳。
presby-（年老）+ -opic（……视力状况的）
presby-（年老）+ -ope（有某种视力状况的人）
presby-（年老）+ -cusis（听力）
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