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Using Lasik to mend astigmatism

After many years of research and clinical testing, the ability to fix astigmatism with lasik eye surgery has finally materialized.In order to comprehend this journey and understand how elimination of astigmatism is possible, it’s important to review some basics, such as understanding astigmatism, its manifestations as well as how lasers treat nearsightedness and astigmatism.
Astigmatism is a condition of the eye where the light beams reaching it come to focus at multiple points.In a perfect eye, the beams should converge on a single point on the macula. This creates a crisp image.In an eye suffering from astigmatism disease, the point is instead a blob, making the image blurry. The brain finds it difficult to interpret this unclear image, so it sends signals to the eye muscles to change the focus to sharpen the image. This futile exercise leads to fatigue, headaches and red eyes.Astigmatism is caused when the horizontal and vertical curvatures of the eye are not similar. This shape imperfection could arise in the cornea (the clear front part of the eye) or the internal structures of the eye. Until now, identification of the source, the amoun, and the exact spread of astigmatism has been a challenge.Recent advances in mapping the shape of the cornea and the wavefront of the eye have been a hallmark advance. Wavefront is the sum of all imperfections in the eye. It is best mapped by a device called iDesign wavescan studio, in which 1,287 beams of light are sent into the eye. They travel through the eye to the retina and bounce back to a computerized detector, which rapidly analyzes the shape and calculates the exact correction required along the 1,287 zones to get a perfect shape. This information is saved on a flash drive, which transfers the information to the latest generation of lasers.Older lasers were broad beam, so each pulse could only treat an area of 6 mm. The latest cutting-edge laser beams can be reduced to smaller zones of 1 mm or less. The shape of the beam can also be matched to information obtained from the iDesign wavescan studio. These lasers are also able to detect any rotation in the eye, as well as track the eye during delivery of the beam. Hence they can treat vertical and horizontal planes differently.Besides astigmatism, there are other aberrations called higher order aberrations, which are responsible for glare and fuzzy edges of objects. These cannot be corrected by glasses or older generation of lasers.The good news is that even they may be reduced by the new advanced technology. Therefore, the incidence of nighttime glare and haloes are markedly reduced.Corneal topography guided laser technology like Catz from Nidek and Contoura from Alcon work similarly; however, they are only limited to mapping the cornea. IDesign by Johnson and Johnson maps the cornea and the internal eye abnormalities. All three of these are FDA-approved technologies that have benefited consumers.The modern advanced iDesign wavefront laser technology is much better than glasses and contact lenses for patients who have astigmatism. The lasers can cure the astigmatism and give sharp vision.If you have waited for technology to fix astigmatism, the time has arrived.Original Source: https://www.toacorn.com/articles/using-lasik-to-mend-astigmatism/ Written By: Published On: Jul 12 2018