What is unclear vision due to hardening of the crystal-lined lens, commonly found among the elderly, called?

The condition characterized by unclear vision due to the hardening of the crystalline lens, particularly prevalent among the elderly, is known as presbyopia. As people age, the lens of the eye becomes less flexible, making it increasingly difficult to focus on close objects. This gradual loss of ability to accommodate for near vision results in the need for reading glasses or bifocals in many older individuals.

Presbyopia is specifically associated with the aging process and is a normal part of visual development in later life. It is crucial to distinguish this condition from others like diplopia, which refers to double vision, amblyopia, commonly known as lazy eye, and myopia, which is nearsightedness. Each of these conditions pertains to different aspects of vision and eye health, but they do not relate to the hardening of the lens associated with age.