Making a traditional glass lens requires a lot of experience, skill, and patience grinding a piece of glass to the required shape, and is not for the casual experimenter. Making a glass Fresnel ...

One starts with a piece of glass, rubs it against an abrasive ... It’s something akin to the injection-molded lenses that are common in mass-produced optical equipment, but with a twist ...

Hold your lids open. Put your index finger on the lens, moving it down as you look up. Use your index finger and thumb pads to squeeze and remove the piece. How To Care for Contacts and Your Eyes ...