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03-28-2008, 11:26 PM
When the surface of a normal eye’s cornea has a spherical curve, like a basketball, light rays passing through it bend towards its center and focus on one spot.
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Sometimes the surface of the cornea is curved more like a football than a basketball, with both flatter and steeper curves. When the surface of the cornea has an uneven curvature, vision becomes distorted. This common irregularity is called corneal astigmatism.
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Following cataract surgery, if you have astigmatism, you may still experience blurred and distorted vision because the standard lens does not correct your astigmatism, just your nearsightedness or farsightedness. To achieve quality distance vision with a standard IOL, you may require eyeglasses, contact lenses, or further surgery.
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One option for correcting astigmatism after cataract surgery is simply glasses or contact lenses; however, there are surgical options that are also available, including LASIK laser vision correction, limbal relaxing incisions, and astigmatic keratotomy. Another new and exciting option is a toric intraocular lens (IOL),
The toric IOL is a lens that is implanted at the time of cataract surgery. Its unique design makes it possible to reduce or significantly improve uncorrected distance vision like a standard or monofocal IOL while eliminating corneal astigmatism. This lens provides better quality distance vision independent of glasses and contact lenses than a standard lens does. The toric intraocular lens is made of the same material already successfully implanted in more than 25 million eyes since 1991.

Implanting this lens does not at all influence the risks of cataract surgery. The procedure itself remains exactly the same except that at the time of lens insertion, this toric lens is implanted instead of a standard lens.

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