Mature people cannot always count on their own eyes. After forty, you may develop presbyopia or presbyopia. Fortunately, you don't have to wait until your hand becomes too short - opticians offer more and more perfect glasses and contact lenses.
A large proportion of people who have reached the maturity limit - 45 years old - know this feeling very well: almost overnight, the contours of the letters of a newspaper or a book read start to blur. In the restaurant menu, detailed descriptions of dishes printed in smaller fonts become blurry, while the menu viewed through the partner's shoulder can be read without any problems. The blame for this ispresbyopia , the so-calledpresbyopia . Its symptom is gradual impairment of near vision.
What is presbyopia?
Presbyopia is nota visual impairmentand should not be confused with hyperopia. At a certain age, it inevitably affects everyone. This is because with age the lens gradually becomes less flexible, loses the ability to accommodate, i.e. good vision of distant and close objects. In order to see well, we then reach for the glasses. People who previously had to wear them due to some kind of visual impairment are forced to use two pairs of glasses interchangeably when presbyopia occurs.
ImportantThrough the cornea to the lens
The light that enters the eye first reaches the cornea. It is a transparent film that covers the pupil and iris of the eye. Because it is convex, it focuses light rays so that they can reach the lens at the right angle, which, by contracting and straining, can focus the image of objects at different distances from the eye exactly on the retina. As a result, we can just as well see a ship on the horizon and an ant in our hand.
Presbyopia - problems with focus
Ophthalmologists say that with presbyopia, the so-called visual near point. It means that we have problems with sharpening the image of objects seen up close. For example, it is difficult for us to read or thread a needle. So we need glasses that will replace the ability of the eye to accommodate. Until now, those who were doomed to wearing two pairs of glasses could make their lives easier by buying the so-called bifocal glasses with clearthe transverse line separating the top (for far vision) from the bottom (for near vision). This line is called a dead zone, which makes us unable to see well in intermediate areas; bifocal lenses provide only distance and near correction.
Glasses for presbyopia
Now we can treat ourselves to the so-called progressive lenses or contact lenses. There is no dead zone in them. Sharpness changes smoothly, without a sudden transition from correction to near and far vision. Progressive spectacle lenses maintain the top-down division, but without a clear line. A progressive contact lens, on the other hand, has two parts: in the center a circle through which we see sharply close and intermediate objects, and on the outside a ring through which we look at distant objects. The lenses are comfortable, but you have to learn to look through them, i.e. maneuver your head properly.
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