Optive Fusion Eye Drops - 10ml Optive Fusion drops have a unique formula that blends several ocular lubricants (sodium hyaluronate, carboxymethylcellulose glycerine) to give enhanced lubrication and protection to the cornea for long lasting relief from moderate to severe dry eye symptoms. Use Optive for less severe symptoms, or consider Optive Plus for a different blend of lubricants. It has a unique formula to provide long lasting comfort. Firstly it lubricates the eye surface, secondly it moisturises the ocular surface cells by restoring the osmotic balance. The multi-use bottle can be kept for 6 months after opening as it has a gentle preservative in called Purite, which breaks down in the eye as natural tear components.