Eye conditions such as short sighted or long sighted cause reduced vision but can
be improved with glasses or contact lenses. These are called refractive errors as
the eye is otherwise healthy and normal vision is possible.
Refractive eye conditions include short sighted, long sighted, rugby ball shaped
( astigmatism ) and reading age ( presbyopia )
Click for more detailed info on each item below.
Short Sighted - Myopia
Vision is better at short distance for short sighted people. Far distance vision
is blurry and so glasses and contact lenses may help.
Short sighted occurs because the length of the eyeball is too long and so images
focus in front of the retina instead. By placing a corrective lenses, the image can
be shifted to focus on the retina.
Eye shape in astigmatism is not regular like a football but more oval shaped like
a rugby ball or egg shaped eye. The image seen is blurred and distorted.
Astigmatism can be of varying amounts and is quite common in most people. Astigmatism
can also be part of short sight and long sighted eye conditions. Click astigmatism
for more info.
Long Sighted - Hyperopia
Harder to see at near, and easier to see into long distance for long sighted people.
Therefore it's harder to read or do prolonged concentrated tasks in long sighted
Long sight occurs because the eyeball length is shorter and so the best focus is
virtually behind the eye. The brain may be to focus it back onto the retina using
focusing muscles. This can lead to eyestrain, headaches, or blur in long sighted
when focusing gets tired. Click on long sight for more information
Reading Age - Presbyopia
Presbyopia is a natural condition when books and newspaper print is blurred or hard
to focus due to ageing of the eye.
The natural lens inside the eye is used to focus at near objects but the ability
declines naturally with age.
Usually reading blur is noticed after age 40 and symptoms gradually decline and lose
focus power till age 65 onwards.
Fortunately reading glasses prescription can help to see at close again during this