Accommodation paralysis

Japanese: 調節麻痺 - ちょうせつまひ（英語表記）accommodation paralysis

Accommodation is the process of increasing the thickness of the crystalline lens, which is a lens inside the eye, to focus on nearby objects. When this ability to accommodate decreases, distant objects can be seen clearly, but close objects cannot be focused on, resulting in poor vision. Presbyopia (farsightedness) is a physiological condition in which the ability to accommodate decreases with age, but when this condition occurs due to pathological causes other than presbyopia, it is called accommodative palsy. It occurs due to paralysis of the ciliary muscle or oculomotor nerve, which act to increase the thickness of the crystalline lens, or due to lesions in the central brain.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

眼内のレンズである水晶体の厚さを増して，近くの目標物を見るためにピントを合わせることを調節という。この調節力が低下すると，遠くのものはよく見えていても，近くのものにピントが合わず，見えにくい状態が起きる。老化によって調節力が低下する生理的な状態が老視(老眼)であるが，老視以外の病的原因でこのような状態が起きたものを調節麻痺という。水晶体の厚さを増すために働く毛様体筋や動眼神経の麻痺，あるいは脳の中枢の病変によって起こる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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