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Prescription Lens Materials & Prescription Lens Types

 

Prescription Lens Types:

  1. Single Vision Lenses - these are what most commonly refer to as "prescription glasses". They only correct for one vision condition, nearsightedness or farsightedness.
  2. Progressive Lenses (also known as No-Line Bifocals, Multifocal Lenses, Varifocal Lenses) - these lenses have a graduated lens power that starts at the top to correct distance vision and gradually changes as you go down the lens for near vision correction.
    • Progressive lenses provide seamless progression of lens powers instead of the combination of two lens powers offered in traditional bifocals
    • Unlike traditional bifocals (which just offer correction for near and distance vision), progressive lenses provide vision correction for all of the intermediate distances as well.
    • No visible line on the lenses has a cosmetic appeal

Prescription Lens Materials:

  1. Polycarbonate Lenses - are the most impact resistant lenses available. The polycarbonate lens material was originally designed for canopies in fighter jet cockpits, and carry the level of impact resistance that you would expect for that use. These lenses also offer very clear optics, making polycarbonate the perfect lens material for active, sports and safety eyewear.
    • Polycarbonate is very lightweight while still offering unrivaled impact resistance
    • Most impact resistant lens material available, 10x more impact resistant than glass or plastic lenses
    • Inherently provides 100% protection from harmful UV rays, no coating needed
  1. High Index Lenses - are made from a denser lens material and therefore do not require as thick of a lens to correct nearsightedness or farsightedness. Regular lenses for high levels of either nearsightedness or farsightedness can become very thick. High Index Lenses cut back on thickness by bending light more efficiently than regular lenses.
    • If you have a strong prescription, high index lenses will be thinner lenses that offer the same power as regular, thicker lenses
    • Patients with stronger prescriptions will be able to fit into more styles of eyeglass frames, greatly increasing their selection of frames to choose from
  1. Photochromic Lenses (also known as Transitions Lenses) - are lenses that automatically adjust their tint depending on the level of UV light. The more UV light that is present, the darker the lens becomes. In environments where less UV light is present the lens "transitions" to clear or a lighter tint.
    • No need to carry around a pair of prescription eyeglasses and prescription sunglasses since Photochromic lenses offer both clear and shaded lenses in one
    • *Note: Driving in Transitions Lenses - Photochromic lenses change when exposed to UV light rays and since car windows filter out UV light, these lenses do not adjust when you are in a car
    • *Note: Clear to Sunglass changes - Although we think Transitions lenses are magical, they don't get completely clear or completely dark enough for our taste in sunglasses. They are a great solution for someone who doesn't want to have two pairs of glasses (clear and sunglasses), but they don't quite excel at either.
  1. Anti-Reflective Coating - an optical coating that is applied to the surface of the eyeglass lenses to reduce reflection and improve efficiency. Anti-Reflective Coatings help to eliminate light reflection from the front as well as the back of the eyeglass lenses
    • Allow more light to enter through the lenses for enhanced vision
    • Lets other people see your eyes and expressions through your lenses instead of their reflection
    • Sharper vision
    • *All lenses come with A/R* (no-glare) and scratch resistant coatings as well as UV protection.
  1. Mirrored Coatings - Superheated metallic oxides are fused to the lens at the molecular level, permanently bonded to create a uniform filtering layer that optimizes contrast and minimizes glare
    • Mirrored lens coatings are designed to balance light between reflection, transmission and absorption. Different mirrored coatings achieve the optimum balance of light for various environments as well as optimizing contrast and minimizing glare.