Refractive Errors
What are refractive errors?
In normal vision, light rays from an object focus on the retina (emmetropia). Alternatively, in the presence of a refractive error, the light rays get focused in front or behind the retina causing blurred vision. Under normal conditions, as the eye ball grows in size from infancy to adulthood, there will be a corresponding change in curvature of cornea and the lens enabling the eye to remain emmetropic, at all ages.
When one of these fails to happen, refractive error occurs:
- The eye ball being larger or smaller than the normal size
- The corneal curvature being flatter or steeper than usual
- Increase or decrease in the power of the lens
