The Zaffater Eye Center offers the AcrySof Toric lens implant, a design proven to correct astigmatism. This lens is used in patients with astigmatism who wish to have their distance vision corrected during cataract surgery.
The AcrySof Toric lens is designed to reduce corneal astigmatism and improve uncorrected functional distance vision. The AcrySof Toric lens offers these advantages over traditional lens implants:
The AcrySof Toric lens is ideal for patients who wish to be corrected for distance vision and are comfortable wearing reading glasses. Because this lens does not offer the ability to accommodate or adjust one's vision to varying distances, glasses would be required for near and intermediate tasks.
Whether myopic or hyperopic, most eyes have corneal astigmatism to some degree. Corneal astigmatism means that the front part of your eye, the clear window you look through, is not perfectly round. Instead of being spherical like a basketball, an astigmatic cornea is slightly flattened, more oval in shape like a football, with one side steeper than the other (as illustrated above).
Because the astigmatic cornea is curved more (steeper) in one direction than the other, light entering the eye is refracted differently as it passes through these different areas. This causes light to come into focus at several different points on the back of the eye, rather than ideally coming into focus at just one point. Depending on the direction and the amount of astigmatism, vision through an astigmatic cornea will be affected in various ways. The illustration (below) gives a broad example of the visual effects, depending on the overall direction of the curve.
Astigmatism can also be corrected using limal relaxation incisions. This procedure involves making tiny incisions in the cornea to "relax" or flatten the steeper meridian, thereby causing the corneal curvature to become more rounded, reducing astigmatism.
These long, thin incisions are placed at the very edge of the cornea (known as the corneal limbus) on the steepest meridian, and differ in number and length according to the amount of astigmatism. Relaxing incisions generally do not eliminate corneal astigmatism completely, but rather reduce it to an acceptable level. Because the cornea is living tissue, there may be "over-response" or "under-response" to these incisions. Seldom is corneal astigmatism completely resolved; however, a significant reduction in your astigmatism produces a more satisfactory uncorrected visual result.
Some patients with extreme amounts of astigmatism may still require the addition of limbal relaxing incisions to correct astigmatism after cataract surgery with the AcrySof toric lens. For these patients implanting the Toric lens means that less corneal surgery in the form of a limbal relaxing incision is needed to achieve the same amount of correction.
In addition to its refractive role, the natural lens inside your eye is also responsible for filtering high-energy blue light commonly found within the sun's rays and some artificial light. As part of the aging process, your natural lens gradually turns yellow and it is thought that this change in color may help to protect the aging retina by filtering more of the these harmful wavelengths.
When your natural lens is removed during cataract surgery, the eye loses the ability to filter blue light because most available lens implants are clear and filter UV light only. Some researchers believe that overexposure to blue light may be harmful to the retina and may contribute to macular degeneration and loss of vision. The AcrySof Toric lens implant is unique in its ability to filter blue light, having a patented yellow tint that filters both UV and blue light.
The light yellow color of the AcrySof Toric lens is very similar to that of your natural lens and is necessary to filter blue light, yet the Toric lens does not.
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Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.