Refractive errors is said to exist when the light rays get focused in front or behind the retina causing blurred vision.
- The eyeball being larger or smaller than the normal size
- Changes in the crystalline lens
- Flat or steep corneal curvature
Types of Refractive Errors
The common types of refractive errors that occur in children are myopia (short sightedness), hyperopia (long sightedness) and Astigmatism.
Hyperopia (long sight)
In Hyperopa or long sightedness, the light rays from an image behind the retina because of the small size of the eye ball.
Myopia (short sight)
The light rays from an object an image in front of the retina. Thos occurs when the cornea is curved too much or if the eye is too long