How Do Toric Lens Work?

Another article from our extensive and ever-growing library of articles of particular interest to both existing and future contact lenses wearers. We want to both educate and inform, so you get the best from your contact lenses.

Prior to we can ask "How do toric lens work", we really want to realize what they do, and what they were created for.

Toric contact lenses can be soft, meaning it is manufactured from soft polymer that can change its shape to healthy the shape of the eye. This is as opposed to hard (gas permeable - GP) lenses which are rigid in construction. A toric lens is favorite, in that it was designed to help correct astigmatism.

What Is Astigmatism?

Astigmatism can take both forms, although it is usually understood to mean an optical malfunction induced by a misshaping of either the cornea or even the optic lens. A normal cornea is 1 with is around in shape, just like a ball. In an astigmatic, the shape is different, and the terminates of the cornea have extended terminates. Even more rugby ball or even american football shaped. What happens then is that the light hits the cornea in both places rather than 1. This is because the shape of the astigmatic eye has a steeper and flatter curve due to the shape of the cornea. This is called corneal astigmatism.

Periodically, astigmatism is the result of an irregularly shaped optic lens, which is found behind the cornea. This is called lenticular astigmatism.

The effect to the sufferer is much the equivalent though. Astigmatism manifests itself as slightly blurred vision, however can also cause headaches and eye aches.

How Is a Toric Lens Different To More Contact Lenses?

When you place a contact lens for your eye, the lens sits on top of a film of water. If it did not, your eye would be dry, and it would cause you discomfort. Because the lens is on a liquid platform, it can rotate, however in non astigmatics, this isn't really a problem. Even so, in an astigmatic, the lens needs to stay put consecutively to correct the astigmatism. In a toric lens, this is achieved by weighting the lens so that the bottom is heavier than the top. This of course means that the bottom of the lens will always point downwards, ensuring that the prescription of the lens acts correctly.

There exists 1 more difference of a toric lens across a normal 1, in that the lens has both prescriptions in 1. 1 will correct the astigmatism, and the more will correct the shortsightedness or even long sightedness (depending on what you have).

Because of the even more complex nature of the toric lens, it is typically even more expensive than conventional lenses.

Charlie Cory is an Internet Entrepeneur.

http://www.fx-eyes.com/how_do_toric_lens_work.html

Article source: http://www.topiccenter.com/Health-and-Fitness/

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