A method of silicate bonding coated and uncoated optical bodies

The invention relates to a method of silicate bonding mutually facing joint surfaces of two components for the purpose of producing an optical element by means of an aqueous alkaline, silicon-containing cations joining solution, characterized in that one or both of said joining surfaces (1; 2b; 10) a layer of an oxide (3), which has a higher refractive index than SiO The invention further teaches the use of the oxide layer (3) as an uppermost layer a with an alkaline, silicate-containing solution to be joined member for avoiding or reduction of turbidity and / or defects as a result of chemical attack on the underlying layer through said alkaline solution.