Presbyopia is a refractive condition in which the accommodative ability of the eye is insufficient for near vision work. It usually occurs at 40-45 years of age but may be earlier in people living in hot climates, people with short arms/working distances and hyperopes and later in people with long arms/working distances and myopes. The amplitude of accommodation falls to zero at about 55 years of age. After that age, the clinically measured amplitude of accommodation is likely to be due to depth of focus. Presbyopes need a near addition (plus lens addition to their distance prescription) that increases as they get older.