Why Does LASIK Cause Dry Eyes?

LASIK may cause some patients to experience Dry Eyes after their surgery. This is especially true if there was tendency toward dry Eyes before the LASIK procedure. During the LASIK procedure, a thin layer of tissue is created, called a flap, under which the actual laser energy is applied to reshape the cornea to correct nearsightedness, farsightedness and astigmatism. Anatomically, when the flap is created, the very fine cornea nerves may be severed as part of the LASIK procedure. This is a normal part of the procedure. However, these nerves are required in order "signal" the Lacrimal Gland to produce tears. So, sometimes, the temporary interruption of the corneal nerve impulses can actually cause a lesser amount of tears to be produced, resulting in Dry Eyes after LASIK. Sometimes if the Dry Eyes after LASIK are moderate or severe, your vision may actually be blurry due to the tear film instability. Your LASIK surgeon may elect to treat you for Dry Eyes before your LASIK procedure in order to fortify your tear film so that you will have a comfortable and asymptomatic post operative period. ALL LASIK patients will need to use artificial tears or lubricating drops as a matter of course as it helps the tear film reestablish itself after the LASIK procedure. During your consultation it is important to disclose any symptoms you may have of Dry Eyes and to disclose any medications you are taking that might predispose you to dry eyes after your LASIK procedure. In this way, your LASIK surgeon can take the necessary steps to prescribe whatever is necessary to obtain the best possible results for you. Fortunately, virtually all Dry Eyes symptoms after LASIK are temporary and gradually decrease over time until they end within a few months of having your LASIK procedure.