It's a normal process where the crystalline lens loses its elasticity and thus can no longer properly focus clearly on objects at different distances.
C'est un processus normal lorsque le cristallin perd de son élasticité et ne peut donc plus faire la mise au point correctement sur des objets proches.
The metabolism of the lens slows down, the concentration of water in the lens decreases, it becomes harder and loses its elasticity.
Le métabolisme du cristallin ralentit, la concentration en eau du cristallin diminue, il devient plus dur et perd de son élasticité.
As we age, the flexible crystalline lens of the eye hardens and loses its elasticity and, at the same time, the ciliary muscle that permits the lens to change its shape weakens and loses its tone.
À mesure qu'on avance en âge, la lentille flexible qu'on appelle le cristallin se durcit et perd de son élasticité et le muscle ciliaire qui permet au cristallin de changer de forme s'affaiblit et perd de son efficacité.
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