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ABOUT PRESBYOPIA


What is presbyopia? 

Presbyopia is an age-related near vision problem that develops in people older than 40 years of age. The shape of the eye lenses may have a tendency to alter. The lens may change its shape by expanding when objects come near thanks to its special capability, thus enhancing vision quality. That is how near vision occurs. After the age of 40, the human eye gradually loses this capability.

Why does presbyopia develop?

When a distant object comes near, the signal reaching the brain is assessed and transmitted to the eye. Here, the muscles in the ciliary body contract and relax, thereby tensing or relaxing the fibers attached to it. This movement of the fibers makes the lens get thinner or thicker and increases its refractive power. The eye loses this ability with aging. Although not proved, the most plausible theory for the age-related loss of this ability is the theory of cell aging. This theory claims that our eye cells lose this ability with aging, just like our hair whitens. Therefore, it is seen not as a pathological condition but as a physiological sign of aging. Presbyopia progresses over the years in everybody in a very standard manner. After 40 years of age, it increases in magnitude +1 every 10 years. At 50 years, it has increased +2, and +3 at 60 years. However, there is an interesting detail here. For example, if the eye is -2, +1 is added at the age of 40. Then you need -1 diopter glasses for near vision. When you become 50 and need -2 diopter glasses for far vision, you no longer need glasses for near vision. So those myopic patients who say "I have very good near vision" do so because two disorders overlap and alleviate the defect.

What are the symptoms of presbyopia?

Presbyopic patients have difficulty in focusing on objects nearer than 50 cm. So they can focus on objects by moving objects away from their eyes.

How is presbyopia treated?

There are many treatment methods used for this disorder around the world. These treatment methods have certain advantages and disadvantages. Intraocular multifocal lens implantation surgeries, which are recognized as the most reliable method for the treatment of presbyopia throughout the world, as well as presbylasik and corneal inlay (Kamra) operations are successfully performed at Dünyagöz Hospitals.

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