求翻译：老花眼是因人老后水晶体(晶状体) 硬化或部分硬化，对光感调节不足，致使光线的焦点不能准确聚集在视网膜上，而落在视网膜后面，使看近距离的物品和文字会出现模糊不清的现象。一般人在40岁左右都会开始出现不同程度的老花。是什么意思？

Presbyopia is due to hardening or partial hardening of the lens (lens) in the old people, the light sense regulation, resulting in the light of the focus can not be accurately gathered on the retina, but falls behind the retina, to see close objects and text will appear blurred not clear of the phen

As a result reading glasses after old people water crystals (lens) cirrhosis or sense some hardened, adjust lighting, due to the lack of focus can not be accurately on the retina, located in the retina, see near objects and text will appear blurred. In general, about 40-year-old will start to appear

Because after presbyopia is the human old crystalline lens (crystalline lens) hardens or the part hardens, to the light feeling adjustment insufficiency, the cause light focal point cannot gather accurately on the retina, but falls behind the retina, causes to look the short distance the goods and t

Presbyopia is due after the old lens (lens) hardening or partially hardened, lack of sense of light adjustment, resulting in light of focus does not accurately gather in the retina, and dropped behind the retina, see close objects and text will appear blurred. Most people began to appear at about 40

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