Vision Defects.
There are lots of vision defects that people are suffering from. These defects include Nearsightedness, Farsightedness and Astigmatism. You will be familiar with these eye defects after reading the following explanation.
1-Nearsightedness:
- Another name for Nearsightedness is myopia. This type of vision effects means that it is easy for the person to see close objects to him but difficult to see far objects. The image of the far object may look fuzzy. People with high Nearsightedness can see only the very close objects to them like their hands for example. But people with mid Nearsightedness can see objects further by yards.
- It happens when the eye ball has an oval shape instead of round. This makes the light rays entering the eye to focus far away in front of the retina instead of falling on it which will cause seeing from a distance a real problem.
2-Farsightedness :
- Farsightedness is also called hyperopia. This eye defects will make people able to see distance objects but unable to see close objects. Farsightedness occur when the eye is very short. The shorten of the eye will cause the light rays entering the eye to fall behind the retina instead of falling on the retina.
- Astigmatism causes vision to be blurred or distorted to some degree at all distances. It is caused by the irregularly shaped cornea or lens. The cornea must be symmetrically round shaped for a normal vision. But people with Astigmatism problem has unevenness cornea or lens parts.