
Having a sufficient, normal healthy tear film is an initial requirement for a successful Lasik eye surgery. A healthy tear film contains several components that actually help to protect the eye against infection under normal circumstances as well as when the eye has undergone a surgical procedure such as LASIK. The tear film provides a smooth optical surface and is actually an integral part of clear vision. During your consultation, your LASIK surgeon will evaluate your tear film.
As part of the LASIK procedure, the surgeon prepares a thin flap under which the laser energy is applied in order to shape the cornea to correct your prescription. It is normal and expected that during the creation of the flap a certain number of the corneal nerves will be temporarily damaged. This means that for some period of time after your LASIK, the regular nerve impulses that control the production of tears will be interrupted. This is a normal and expected part of the healing process after LASIK. It can be accompanied by dry, gritty and uncomfortable sensations. In order to avoid this, your surgeon will have carefully examined your tear film beforehand. But, more importantly, every LASIK patient will need to use lubricating and moisturizing drops after their procedure. This is normal. You must keep the eye adequately bathed in tears in order for them to heal properly, so that you should use the lubricating drops provided by your surgeon as directed. Again, it is normal that almost all LASIK patients experience some degree of dry, gritty sensation after their procedure but in almost all cases, after several weeks of perhaps a couple of months, the symptoms of dry eyes are no longer noticeable as your eyes have healed and your tear film returns to its normal condition.