Refractive error is a very common eye disorder. It occurs when the eye cannot clearly focus on images.The result is blurred vision which can be serious enough to cause an impairment.
The four most common refractive errors are:
- myopia (nearsightedness): difficulty in seeing distant objects clearly;
- hyperopia (farsightedness): difficulty in seeing close objects clearly;
- astigmatism: distorted vision resulting from an irregularly curved cornea, the clear covering of the eyeball.
- presbyopia: which leads to difficulty in reading or seeing at arm’s length, it is linked to ageing and occurs almost universally.
The most common form of treatment for this are glasses, contact lenses and surgery.