OPTIVISION ONLY USES THE BEST QUALITY LENSES

In todays technology lenses can be be made in many forms:

SINGLE VISION - For either distance or reading only.

BIFOCAL - Both distance and reading with one pair of glasses but has a      distinct line visible on the lens.

VARIFOCAL - Allows clear vision at any distance from near to far without any visible lines on the lens.

HI-INDEX - Lenses that are thinner than normal index materials.

PHOTOCHROMIC - Lenses that react to the the sun (UV Light), making them go dark in the sun and nearly clear indoors.