optical glass

They've licked the problem of optical glass over there, but they still have a lot to learn about leather.

It was optical glass, from a pair of men's spectacles found at the scene.

He stared into the optical glass, wondering at himself.

The first spectacles utilized quartz lenses since optical glass had not been developed.

Each lens consists of special optical glass and measures just five millimeters in diameter.

It is also used in making optical glasses and lenses.

Among other things, Ohara is a major supplier of optical glass.

They produce more than 300 tons of optical glass a month.

Virtually all the optical glass used in reconnaissance satellites comes from Germany.

In return, Japan needed mercury and high-quality optical glass.