Tant Laboratories, Ltd. Founded in 1981. Offering uncut lenses and glazing services to retail ophthalmic opticians, also Hi-Index, progressive and photochromic lenses, includes photos and online order form and contact information.
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Progressive Lenses Progressive lenses, also called progressive addition lenses, progressive power lenses, and varifocal lenses, are glasses used to correct presbyopia when a person has some other refraction error such as myopia or astigmatism. A gradient of increasing lens power is added to the correction for the other refraction error, going from nothing at the top of the lens to maximum magnification at the bottom of the lens. A wearer can then adjust the lens power required for clear vision at different viewing distances by tilting his or her head to place the line of sight through different parts of the lens.