Optase® Moist Heat Mask is a heated, reusable eye mask for soothing, effective relief of Dry Eye, Blepharitis, MGD, Chalazion and Styes. It features HydroBead™ technology, which absorbs moisture from the air and releases a natural, constant moist heat. Simple to use: 25 seconds in an 800W microwave will provide 10 minutes of the recommended Moist Heat Therapy. Now available on NHS prescription.