Reduced ability to focus caused by loss of elasticity of crystalline lens with age.
Vision defect, an increasing inability with advancing age to focus on near objects. It is caused by thickening and loss of elasticity in the lens, which is no longer able to relax to the near-spherical shape required for near vision.
Défaut de la vision qui vient avec l'âge et fait que l'on ne voit plus ce qui est proche.