Carboxymethyl cellulose, which is the main constituent of Optive Fusion 5 MG Eye Drops is obtained from cellulose and is used for the relief of burning, itching, the discomfort of eyes caused due to dryness or exposure to the sun or the wind. Preservative-Free Eye Drops provide instant relief of dry, irritated and gritty eyes, and are compatible with contact lenses and suitable for use post LASIK surgery.