These strips work by staining the cornea blue upon instillation. This causes “speckling” of the cornea, which gives the user immediate indication of any dry patches, as well as any muco-deficient or damaged corneal cells. To indicate any dry patches, as well as any mucus-deficient or damaged corneal epithelial cells It does not stain healthy, proliferating ocular surface cells and has a minimal effect on cell viability It does not sting the eye like Rose Bengal, and a white light or blue light can be used on the slit lamp during detection Each strip is impregnated with approximately 1.50 mg of Lissamine Green Innovative peel open packing with transparent film on one side Please Note : Import Duty & Taxes at the Destination (if any), shall be paid by the Buyer. Kindly check in advance, to a