They prescribed eyeglasses or contact lenses and told you that you have myopia, or hyperopia (farsightedness), or astigmatism, or a combination of these conditions. But what is the difference between these three common defects of sight (which, by the way, are not diseases)? Here we explain it to you …
Is it hard to see the cinema screen clearly – or even your television? If you do not have difficulty seeing near objects, but you should squint to focus on distant objects, you may be short of sight. Being short-sighted is the common term used for a vision problem called myopia .
Myopia is a condition that happens inside the eye. The eyeball is too long or the cornea or lens (lens) are too curved, which causes the images to converge in front of the retina, the area that “processes” the visual images. People who are short of sight can clearly see objects that are “close”, but see those that are distant with less clarity or in a blurry way.
Now, if you ever noticed that a friend or elderly relative has to hold a book at a distance to read it – that person may suffer from hyperopia . The term “hyperopia” is used to describe a visual problem also called hyperopia .
A person suffering from hyperopia sees objects at a certain distance clearly, but has difficulty seeing objects that are very close. Like nearsightedness (near vision), farsightedness takes place within the same eye. The eyeball is too short from the front to the back and the lens of the eye has difficulty rounding to focus properly. This causes the image to converge behind the retina, the area that “processes” the visual images.
The astigmatism is a form of blurred vision, and a visual problem caused by the irregular curvature of the outer eye (cornea). Because the eye has an irregular curvature, the light is processed differently, which results in the focus of two image points on the retina instead of one.
As you can imagine, the existence of two images processed separately causes a slight, moderate or severe blurred vision in one or both eyes. Symptoms include tendency to squint, eye strain or fatigue and recurrent headaches .
Research shows that about one in three people suffer from some form of astigmatism.
Myopia, hyperopia and astigmatism are common eye problems, which can worsen with age. All are diagnosed by a simple visual acuity test and are generally quite easy to treat with glasses or contact lenses .