Share 19/02/2019 Side effects of LASIK – (PART 2) Hope you have had a chance to read our previous blog on the Side Effects of LASIK. In this article, we throw more light on the topic that will help you make an informed choice before you choose to proceed with LASIK eye surgery. Ectasia The cornea receives its strength from small collagen fibres that criss-cross the cornea. Some individuals are born with abnormal collagen patterns that create weak corneas. These weak corneas can progressively lose their normal round shape causing blurry vision. This process is called ectasia. It is not safe to create a flap in a cornea that is already weak as this would accelerate ectasia. Modern pre-testing machines help surgeons better identify these weak corneas before surgery. Having said that, the testing equipment is not perfect and some patients still develop ectasia as one of the risks of LASIK. If you are a vigorous eye rubber, discuss this with your LASIK eye surgeon as this can cause ectasia. Dry Eye Most patients experience dry eye symptoms for the first three to six months after LASIK. During that time, many need to take artificial tears to maintain comfort and visual quality. Almost all patients return to their baseline after that healing process. In rare circumstances, the dryness may persist for longer and impact the consistency of visual quality and the way your eyes feel. If you have significant dry eye problems even before LASIK, then you should discuss these symptoms carefully prior to LASIK with the LASIK surgeon Astigmatism Many patients see better after LASIK without glasses than they did before with glasses. This is also true for night driving. However, there are some that technically see 20/20 but feel that the quality of their vision is not as crisp as before surgery or that they have some difficulty with night driving. Usually this is because there is a small amount of uncorrected near-sightedness or astigmatism. If the symptoms are mild and more of an observation than a problem, then doing nothing is usually the best course of action. If the problems are impacting your lifestyle then glasses, contact lenses, or a LASIK enhancement can be considered. Quality of Vision Near-sightedness or astigmatism is considered a lower order cause of defocus. There are other more complex causes of defocus. These are called higher order aberrations. If these are causing a decrease in the quality of your vision, we can measure the aberrations with an aberrometer and consider a wave-front guided enhancement to try to improve visual quality. For any queries you may have on LASIK and its risks, do reach out to us.