What is Presbyopia?
Presbyopia is an age-related problem in near focusing ability in people over 40 years of age. The lens inside our eyes is flexible. The special flexibility of the lens allows it to thicken when objects come closer, improving the vision. This is the way how near focusing occurs. The human eye slowly begins to lose this ability after the age of 40.
Why Does Presbyopia Occur?
When a distant object comes closer, the stimulus reaching the brain is evaluated and transmitted to the eye. "Ciliary body" is a region in the eye and it contains muscles and fibers that contract and relax upon receiving such stimuli. These movements of the fibers causes the lens to become thinner or thicker, resulting in increased refractivity. The eye loses this ability with advanced age. Although it has not been established yet, the theory of cellular aging is the closest explanation to the age-related loss of near focusing ability. This theory implies that our eye cells, too, lose their specific abilities just as our hair, which loses color with aging. Therefore, the problem is not considered pathological but it is accepted as a physiological consequence of aging.
What Are The Symptoms of Presbyopia?
Presbyopia patients experience difficulties in seeing the objects at a distance of closer than 50 cm. Therefore, they can see things more clearly when they increase the distance between the objects and their eyes.
How Is Presbyopia Treated?
All over the world, presbyopia is treated primarily by placing intraocular trifocal lenses and by laser surgery for presbyopia.