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Preservative-free eye drops are found in single vials. However, single unit-dose artificial tears without preservatives are more expensive than bottled artificial tears with preservatives. [9] Some patients confuse over the counter drops that contain tetrahydrozoline (i.e. Visine®), a vasoconstrictor, with artificial tears. [11]
Sodium hyaluronate is the sodium salt of hyaluronic acid.It is a glycosaminoglycan and long-chain polymer of disaccharide units of Na-glucuronate-N-acetylglucosamine. It can bind to specific receptors for which it has a high affinity.
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