Lens Materials


Lens base curvature:

Most plano(non-corrective)sunglass lenses are spherical in shape meaning the lens is the same curvature in all meridians. In optics, lens base curve is measured with a tool called a lens clock on the outside surface of the lens. A flat surface would be shown as zero. A lens clock is a mechanical dial caliper that is used to measure dioptric power of a lens. It is a specialized version of a spherometer. The greater the numeric value, the greater the curvature of the lens. In corrective optics the curvature between the inside and outside lens surfaces would be different and a calculation would determine the power of the lens. For sunglasses the curvatures are roughly the same inside and out and no power is introduced into the lens.


Tri-Oxide mirror coatings are multiple layers of metallic oxide coatings that selectively filter light. This allows us to use lighter density lens colors while still allowing squint free vision.