| http://www.w3.org/ns/prov#value | - Such an acid, base and/or buffer is preferably included in an amount required to maintain pH of the composition in an ophthalmically acceptable range. [0095] Accordingly, a particular embodiment of the invention is a composition as described hereinabove, further comprising a buffering agent and/or an agent for adjusting osmolality in amounts whereby the solution is substantially isotonic and has a
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