After 40 years begins to appear. You know when it arrives because it is hard to thread a needle or read the small print of a document. It can not be prevented, but it can be corrected. It is the presbyopia , although it is better known as tired eyesight , and it's a good reason to go to the ophthalmologist.
The first symptoms of presbyopia are well known: see badly up close , need plenty of light and feel tired when reading at the end of the day.
It is a physiological process that reaches its maximum level at 65 years and affects some 1.8 billion people in the world.
Presbyopia is the decrease in the ability to focus on objects at different distances (accommodation); responsible for this task is the lens, a transparent lens located behind the pupil whose function is to focus the light rays to form a good image in the retina. With age, the crystalline lens loses flexibility and accommodation, which is why it can not focus properly on objects.
Presbyopia can not be prevented: neither the consumption of certain vitamins nor visual training are effective, however it is easy to detect and correct, either with glasses, contact lenses or surgery, using lasers or lenses implanted inside the eye.
Antonio Piñeiro, Head of the ophthalmology service at the University Hospital of Valme, Seville, Spain, points out that the possibility that this type of intraocular lens works is very high.
However, it is necessary to inform the patient both about the characteristics of the surgical intervention and the results of the same. Expectations are always high and, sometimes, it is not possible to recover a perfect focus ability or decreases night vision.
The most recent surgical treatment of presbyopia is underway. It is known as the Phaco ersatz project, and consists of restoring the accommodation of the eye by replacing only the content of the lens with a polymer gel, transparent and biocompatible, and preserving the rest of the tissues as well as the bag that protects it.
This technique is being investigated in the United States, China and Australia and it is expected that the eyes of millions of people will live to see it.