Abstract: The invention is a method of metering liquid lens monomer on to the surface of a concave spin casting mold. This is done by an atomized liquid spray applied to the mold optical surface for a precise time. An inert gas such as nitrogen is used to propel the atomized spray from the spray nozzle to the optical mold surface. The atomized spray wets the optical surface evenly reducing the contact angle to the receding angle. The duration of the spray can be precisely timed by an electronic timer valve. The volume of monomer deposited can be precisely controlled therefore the lens thickness is precisely controlled.