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Abstract

An aqueous contact lens storage solution comprises a viscoelastic rheology modifier; and not more than 0.3% w/v of an alkali metal salt; the solution has a pH of between 6.0 and 8.0 and an osmolality of between 100 and 400 mOsm/kg, and the solution has viscoelastic properties, even if heat sterilized at 121.degree. C. for at least 15 minutes. The viscoelastic rheology modifier may be selected from the following acids or their alkali metal salts: hyaluronic acid, poly (acrylic acid), crosslinked poly (acrylic acid), poly (methacrylic acid), carboxymethyl cellulose, alginic acid and mixtures thereof. The alkali metal salt may be present in an amount of from 0.01% to 0.3% w/v, and be selected from sodium chloride, sodium bicarbonate, sodium dihydrogen phosphate, disodium hydrogen phosphate, trisodium phosphate, sodium tetraborate, sodium citrate, sodium acetate, sodium lactate, potassium chloride, potassium bicarbonate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, tripotassium phosphate, potassium tetraborate, potassium citrate, potassium acetate, potassium lactate and mixtures thereof. The solution may be an inhomogeneous combination of a gel component and an additional liquid component. If so, the solution has a pH of between 6.0 and 8.0 and an osmolality of between 100 and 400 mOsm/kg when in a homogeneous form.

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