Treat Your Patients' Mild to Moderate Dry Eye Symptoms with a Preservative-Free Formula. For patients with sensitive eyes, Blink® Tears Preservative Free Drops provide all the relief of Blink® Tears Lubricating Eye Drops in a preservative-free, gentle formula. Recommend Blink® Tears Preservative Free Drops to your patients with mild to moderate dry eye and preservative sensitivity to give them relief from their dry eye symptoms.