A process for producing an optical glass with an anti-fog coating is disclosed. The process includes the steps of: a) providing an optical glass, b) preparing a layer having Si—H groups (silane groups) on the optical glass, and c) reacting the silane groups with a compound having hydrophilic groups and at least one group reactive to the silane group.

Provided is oxide glass in which a content of P.sup.5+ is 7 to 43 cation %, a content of Nb ions is 10 to 21 cation %, a content of Li.sup.+ is 20 cation % or more, a total content of Nb ions and Li.sup.+ is 48 to 70 cation %, a content of Bi ions is more than 0 cation % and is equal to or less than 6 cation %, a content of Ba.sup.2+ is 5 cation % or less, a content of Zr.sup.4+ is 2 cation % or less, a total content of Ti ions and W ions is 5 cation % or less, and a cation ratio of the content of Li.sup.+ to a total content of Li.sup.+, Na.sup.+, and K.sup.+[Li.sup.+/(Li.sup.++Na.sup.++K.sup.+)] is 0.5 or more.

A process for producing an optical glass with an anti-fog coating is disclosed. The process includes the steps of: a) providing an optical glass, b) preparing a layer having SiH groups (silane groups) on the optical glass, and c) reacting the silane groups with a compound having hydrophilic groups and at least one group reactive to the silane group.