Presbyopia

noun

1. Inability of the eye to focus sharply on nearby objects, resulting from loss of elasticity of the crystalline lens with advancing age.
2. Diminished power of accommodation for near objects, incident to advancing years, and due to progressive loss of elasticity in the crystalline lens.
3. A defect of vision consequent upon advancing age. It is due to rigidity of the crystalline lens, which produces difficulty of accommodation and recession of the near point of vision, so that objects very near the eyes can not be seen distinctly without the use of convex glasses. Called also presbytia.
4. Inability of the eye, due to ageing, to focus on nearby objects; farsightedness
5. a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45