Contact Lenses for Astigmatism

Astigmatism is an eye problem that results in blurred vision. It usually accompanies myopia (short-sightedness) and hyperopia (farsightedness). Astigmatism can be either corneal or lenticular. The former type is due to irregularity in the shape of cornea, whereas the latter is due to abnormal curvature of the lens. Both genetic and environmental factors play a major role in causing astigmatism. Some people are born with oblong-shaped cornea that results in blurred vision. At times, astigmatism is caused due to eye surgery, eye injury and keratoconus disease (thinning of cornea).

Light when passed through this abnormal cornea or lens is not focused properly on the retina, thus resulting in blurred vision. Mild cases of astigmatism does not affect the normal lifestyle of an individual. In fact, nearly all people have astigmatism to some extent. However, a severe astigmatism may lead to eye discomfort, distorted vision and headaches. After correct diagnosis, the eye care practitioner may prescribe regular use of corrective lenses or eye surgery. The options for corrective lenses are spectacles and contact lenses.

Contact Lenses for Astigmatism

It is a common belief that astigmatism cannot be corrected by using contact lenses, which is not true. Nowadays, toric contact lens is available that can effectively correct vision. Toric lenses are specially developed for people with astigmatism. In toric contact lenses, an additional power element with greater light-bending properties is used for proper focusing of the light on the retina. This additional element is known as cylinder.

As per your convenience, you can use rigid gas permeable (RGP) or soft toric contact lenses. RGP is a type of contact lens that makes use of silicone and allows oxygen transmission much better than soft toric lens. Though RGP is not as flexible as the soft toric contact lens, it is comparatively softer than the traditional hard contact lenses. RGP is not very comfortable for first time users, as it is made of stiff material and does not adapt to the eye instantly.

Some people prefer to use rigid permeable lens as it offers good vision, with easy cleaning and long-lasting features. The rigid lens of RGP retains its shape even after prolonged use, hence it provides better vision to individuals suffering from astigmatism. With proper care, RGP may last for many years. Another advantage of RGP is that it is more resistant to deposits than the soft toric lens; the proteins and lipids present in the tears do not accumulate in the lens.

For individuals who are first-time users of contact lens, soft toric lens is a better option. As the name suggests, it is softer and more convenient to use than any other contact lenses. In addition, toric contact lenses for astigmatism are available in various colors. There are also daily-disposable and frequent-replacement toric contact lenses.

While speaking about the best contact lens option for astigmatism, it is claimed that RGP is best-suited for mild cases, whereas for moderate to severe astigmatism, soft toric lens is comfortable. If there is any confusion about the correct brand for your eyes, it is always advisable to consult your eye care practitioner before choosing the right contact lenses.