While in the state of rest, the eye is sharpened for distant vision. In order to allow the eye to sharpen the image of closer objects, the cillary muscles are tightened and thereby thicken the lens; this process is called accomodations (adaptation). With age, the lens of the eye becomes hard, affecting the ability to change the shape, and thereby sharpening the image of closer objects. This deterioration of lens elasticity is called presbyopia (age-related long sight).
Age-related old sight is usually noticed for the first time around 45 years, and then becomes more pronounced. If you do not resort to visual correction, you will only be able to read it if you keep the print away from your eyes. On the other hand, people with short-sightedness sometimes have to remove their eyeglasses so that they can read at a normal distance.
What to do?
If you notice that a picture of a close object is somewhat vague, contact the ophthalmologist.
If you have presbyopia, the ophthalmologist will prescribe spectacles with convex lenses that will enhance the power of the lens in your eyes and allow you to clearly see the objects closest to you.
Every few years you will need some stronger goggles to compensate the weaker elasticity of natural lenses in the eye. If you are long sighted, short sighted or astigmatic, and therefore already wearing distance spectacles, you will be able to avoid wearing two eyeglasses with special, bifocal lenses. Part of these lenses are intended for viewing in the distance, while the other part for viewing in the vicinity.