This patient recieved monovision at the time of his cataract surgery.
Around the age of 40, the natural lens in the eye loses its ability to accomodate. As children the accommodative mechanism is fairly strong but eventually aging will harden the lens and the focusing power of the eye is diminished. An increased difficulty with near visual work may become more noticeable such as reading fine print, sewing, and other hobbies. This vision problem can be corrected with the use of eyeglasses, contacts or surgical implantation of a man made lens during cataract surgery.