Lubricating and Hydrating Formula Penetrates the Surface to Relieve Dryness. Also Recommended for Lasik Dryness. Long-Lasting Hydration. Preservative-Free. Value Size 60 Vials. 0.01 fl oz (0.4 mL) Each Sterile. Refresh. Make your dry eyes feel better with the drops doctors recommend. Refresh Optive Lubricant Eye Drops relives Dry Eye symptoms by delivering long-lasting hydration to the tear film while also providing lubrication and protection to the ocular surface cells that can become damaged due to Dry Eye. Effectively relives Dry Eye symptoms that may occur following Lasik surgery. Refresh Optive 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. What Can Cause Dry Eye? Heating and air conditioning. Computer use and reading. Wind and sun. Certain medications. Natural aging process. Lasik procedures. Uses. 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.