Gp lenses contain very little water and remain rigid on the eye. Plastic as well as glass lenses are produced by successive stages of fine grinding polishing and shaping.

How Prescription Eyeglasses Lenses Are Made Fit Youtube

Stock lenses and semi finished lenses made of plastic are created in a casting process.

How are lenses made. A simple lens sees well through its center but its vision around the edges tends to blur. How gas permeable contacts are made most rigid gas permeable lenses rgp or gp lenses are made of oxygen permeable plastic polymers containing silicone and fluorine. Then the semi finished lens is ready for use.

Lenses that require it are tinted and each lens is compared to the sample to ensure a perfect match. First the lens designer calculates the best curvatures necessary for superior optical quality. Glass and plastic type lenses with the exception of polycarbonate are made from a molding process.

Special ingredients such as for improving uv absorption are added to the liquid materials called monomers. After your lenses are polished and engraved they go through inspection and any lens deemed flawed will have to be redone. This mixture is poured into molds hardened and then processed to reduce residual stress.

They are then dipped in a number of baths until they are perfectly cleaned. Lenses are made of optical glass or plastic. While the same process is used to produce lenses for telescopes microscopes binoculars cameras and various projectors such lenses are usually larger and thicker and require greater precision and power.

They focus light rays by refracting or bending them so that they meet or converge at a common point. Then a computerized program attached to a digital file and lathe cuts the inside top surface of the mold.