For the temporary relief of burning, irritation and discomfort due to dryness of the eye or exposure to wind or sun. May be used as a protectant against further irritation. Fast acting, long lasting formula for sensitive eyes that has many of the same healthy qualities as your own natural tears. Demonstrated to improve dry eye when used after LASIK. These drops come in preservative-free single-use vials and are safe to use as often as needed, so your eyes can feel good - anytime, anywhere. Sterile.