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Astigmatism
In an astigmatic eye, the images received are distorted because of an abnormal curve of the cornea. The cornea’s surface is not round but ellipsoidal, and therefore the light can never focus perfectly on the retina.
Astigmatism is a refractive error due to which the rays of light entering the eye are not focalized on one point but on two distinct points that are not necessarily found on the retina. The focus depends on the eventual association with nearsightedness or farsightedness (Fig.1).
Astigmatism results when the interior surface of the eye, the cornea, has an irregular curve. In fact, it is usually homogeneous and has a substantially round profile which resembles that of a soccer ball (Fig.2).
In astigmatism, the curve along the main meridians is more accentuated with respect to the other.
This determines the shape of the anterior part of the cornea making it look more like a rugby ball (Fig.3).
As an alternative to eyeglasses or contact lenses astigmatism can be corrected through an innovative surgery performed with two lasers (TLCT) and with either the Lasik or the PRK techniques. (Fig.4-5). Laser correction of astigmatism consists in reshaping the irregular corneal curve, and refocusing the multiple focal points on a single focal point on the retina.
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TLCT
Correction of all types of astigmatism with the new TLCT (Two Laser Combined Technique) with the combined use of two excimer lasers to definitely correct refractive defects. |
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Lasik
Dr. Appiotti performs surgery with the LASIK technique, and the PRK NIDEK EC-5000 and VISX S4 excimer lasers for the permanent correction of visual defects. |
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PRK
Dr. Angelo Appiotti performs surgery for the permanent correction of visual defects through the use of excimer NIDEK EC-5000 lasers, and VISX S4, PRK and LASIK. |
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