Refractive Error – 屈光不正(視力模糊)


What causes blurred vision?

If your vision is blurred, it could simply be due to a refractive error. This means that light rays do not properly focus on the retina.

Types of refractive error:

What causes myopia?

Myopia means that the eye is longer or more powerful than the normal eye and the rays of light come to focus in front of the retina, causing the vision to be blurred. Myopia may have its onset in childhood and may progress as a child grows, due to lengthening of the eyeball. Recent research into childhood myopia has shown that there are a number of lifestyle changes and medical interventions that can slow progression of myopia in children. The length of the eyeball can be easily measured, so that progression can be accurately followed.

What causes hypermetropia/hyperopia?

Hypermetropia or hyperopia mean that the eye shorter or less powerful than normal and the raise of light come to focus behind the eye.

What causes astigmatism?

Astigmatism is usually caused by the front surface of the eye being more shaped like a rugby ball than a soccer ball, causing the raise of light to focus at different points. This results in a blurred image.