| http://www.w3.org/ns/prov#value | - The buffering agent is not particularly limited so long as it is opthalomologically acceptable, and examples of which include boric acid and its sodium salt, phosphoric acid and its sodium salt, citric acid and its sodium salt, lactic acid and its sodium salt, an amino acid such as glycine or glutamic acid and its sodium salt, and malic acid and its sodium salt.
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