What is Astigmatism and can it be corrected with Contact Lenses?

Astigmatism results from the eye not being totally spherical in shape (like a football), but rather having one axis steeper than the other (like a rugby ball). This is not uncommon, with more than 95% of the population having some degree of astigmatism. The higher the level of astigmatism, the poorer the person's vision is if it is not corrected.

Although it was once considered more difficult to correct astigmatism with contact lenses than with glasses, this is no longer the case:

Soft contact lenses wrap to the shape of the eye like a glove and are therefore unable to correct astigmatism in their basic form. However, they can be made in a form, with one axis able to correct more refractive error than the other (called toric lenses). This type of lens needs a little more care in fitting than basic soft contact lenses but can be done easily at your eye exam. Toric lenses are now available as two weekly, monthly and daily lenses in a wide range of prescriptions.

Rigid contact lenses do not conform to the shape of the eye due to their rigid nature and are therefore able to correct low to medium levels of astigmatism in their basic form. For higher levels of astigmatism, they can be made with one axis able to correct more refractive error than the other. This type of lens needs more care in fitting than basic rigid contact lenses as the angle and power of the astigmatic correction needs to be matched to that of the eye. These lenses are usually worn during the day only and last for approximately one year.