Presbyopia (vision over 40) is the gradual reduction in the amount that the eye can change its focus. The changes are the result of the continued growth of the biological lens inside the eye, resulting in a lack of flexibility in the lens when readjusting to focus at different distances. It is a normal part of ageing.
Presbyopia usually becomes noticeable between the ages of 40 and 50 as an inability to focus on near objects. People in this age group often find that they have to hold things further away to see them clearly. Everyone experiences the ageing process that causes presbyopia. The condition cannot be prevented.
Presbyopia can be corrected by an optical prescription specifically designed for close work. This can be provided in many forms, including reading glasses, bifocals, trifocals and progressive lenses or contact lenses. Presbyopia will continue regardless of whether spectacles are worn. Wearing spectacles will not accelerate or slow the development of presbyopia.