Astigmatism

Astigmatism is a condition that causes blurred vision due either to the irregular shape of the cornea (the clear front surface of the eye) or due to irregularities inside the eye. Light entering the eye in the vertical axis (at 12 o’clock and 6 o’clock, for example) will be focused in a different place than light entering the eye in the horizontal axis (3 o’clock and 9 o’clock). As a result, vision is blurred at any distance.

Astigmatism can cause difficulties in seeing fine detail, and in some cases vertical lines may appear to be tilted.

Almost everyone has some amount of astigmatism. For most people, the amount of astigmatism is small enough that they don’t notice it. When the amount of astigmatism reaches the point that it causes blurred vision or headaches, correction is called for.

Astigmatism may be treated with a type of contact lens called a toric. A toric lens will focus light in the vertical axis in one way and the light in the horizontal axis in a different way. As such, light from both axes now falls directly on the retina. Because GP lenses are rigid and will hold their shape well, they are especially well suited to treating astigmatism.

Astigmatism

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