Far distance vision is blurry. Its easier to see at shorter distances than far, hence
the term short sighted.
The scientific term is Myopia and a short sighted person with this condition is said
to be myopic.
Why does short sight occur ?
Peoples eyeball length varies and if its too long for the power of the eye, then
an image falls in front of the retina. The image will then pass onto the retina
but will be out of focus.
Treatment of short sight
Short sighted is corrected by glasses or contact lenses. Surgical treatment is also
An optical lens placed in front of an eye, can alter the path of an image. A concave
shaped lens will bend the light away - diverges - so that rays of light can now fall
onto the correct position on the retina instead of before it.
The optician can determine the correct strength of the lens that is needed to do
this. A higher number value means more powerful lenses.
A concave lens is measured in minus figures - and the unit of measure is Dioptres.
For example, a low prescription may be -1.50 Dioptres and a high prescription may
be -7.50 Dioptres.
Symptoms of Short Sight
Blurred vision in distance e.g. school board, road signs , TV
Short sight may cause eyestrain and tiredness esp if person is narrowing lids to
try to make things clearer.
May be able to read and use VDU without any problems - but for some, even VDU and
reading can be blurred if they are very short sighted.
Remember, best to seek medical advice as symptoms can be caused by other eye conditions
Will my short sighted vision get worse ?
The eye naturally changes. A common pattern is that the short sight tends to get
worse during childhood esp teenage period up to young adult hood. It usually settles
down by then, and remains steady - but can then improve a little bit in mid life.
It may then get worse again later in life.
The onset of short sight can be a factor - usually the prescription is higher if
spectacles were needed during early childhood.
There is adult onset myopia - which may occur in early twenties - and thought to
be due to prolonged close work such as studying, administration work and VDU. The
prescription tends to be lower though and usually does not have large increases year
Causes of Short Sight
Many factors such as diet, prolonged close work and genetics can cause short sight
. For example in poorly controlled diabetes, it can cause temporary short sight
shifts ( as well as possibly diabetic eye disease changes )
Wearing the full correction during childhood has been shown to help. Even though
the prescription may go up, the rate of change was less than children not wearing
the full correction.
Taking regular breaks from prolonged close work such as VDU may ease the short sighted