Still another defect of vision is known as presbyopia or farsightedness due to old age.
"Old sight," known as presbyopia, is a common defect of vision in advancing years.
"far-sightedness brought on by age," 1791, medical Latin, from Greek presbys "old man" (see presby-) + -opia, from ops "eye" (see eye (n.)). Related: Presbyopic.
presbyopia pres·by·o·pi·a (prěz'bē-ō'pē-ə, prěs'-)n. Inability of the eye to focus sharply on nearby objects, resulting from loss of elasticity of the crystalline lens with advancing age.