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Refractive ErrorsWhat are refractive errors ?, they occur when the refracted (bent) light which enters the eye is not sharply focussed at the light sensitive tissue
The normal eye produces a clear sharp image at all distances.See diagram 
MyopiaWith myopia (short sight) vision in the distance is blurred.This is commonly caused by the light rays coming into the eye forming a sharp focus in front of the retina, instead of directly onto it as they would do in an eye with normal vision.(see diagram below) For more information about laser eye surgery to correct myopia just
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HyperopiaHyperopia or long sight causes close up vision to be blurred,in this case the light entering the eye focusses at a point behind the retina (see diagram below)For further information about surgery to correct hyperopia
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AstigmatismAstigmatism occurs when the cornea and other structures like the lens inside the eye are not perfectly spherical but more rugby ball shaped this causes the light inside the eye to be bent in different directions with no clear focus.(see graphic below)Find out more about refractive surgery to correct astigmatism
here
Astigmatism is often mis-spelt as stigmatism PresbyopiaPresbyopia ocurs as a natural ageing process resulting in longsight.As we age the crystalline lens inside our eye loses its flexibility making it more diffult to see near objects clearly. Further info on laser eye surgery for presbyopia follow this link KeratoconusKeratoconus (further details on Keratoconus here ) which is commonly inherited disease occurs when the cornea at the front of the eye is more conically rather than spherically shaped,causing both a high level of short sight and astigamtismsee diagram below 
To find more information about laser eye surgery to correct keratoconus click here More about your Eyes and Vision here Vision problems can be discovered with a routine eye test From Refractive Errors back to laser eye surgery review home page
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