Looking at Lenses The two best-selling eyeglass lenses are the most basic ones: CR-39 and the polycarbonate, both plastic. (Few people now use glass, which is heavy and breakable.) If you have a single-vision prescription (glasses to see far away or close up), you can generally get by with CR-39 lenses.

The two most common types of lenses are concave and convex lenses, which are illustrated below in Figure 1.

When we talk about the “holy trinity” of lenses, we’re talking about three lenses that work together in a group that allow photographers the flexibility to shoot in almost any situation with precision and efficiency. Those three lenses usually consist of a wide-angle zoom, a standard zoom, and a telephoto zoom.

Costco has been using Essilor technology, and lens designs for some time. One of their featured progressive designs has been the Accolade Freedom™, and Accolade Freedom 3.0™ HD. This is a brand, and a design, licensed to Essilor. More recently, Costco has been promoting their Kirkland Signature™ HD Progressive Lenses.

Popular progressive high-definition lenses for correcting presbyopia include:

• Hoyalux iD MyStyle (Hoya Vision Care)
• Seiko Supercede (Seiko Optical Products of America)
• Shamir Autograph II (Shamir Insight)
• Varilux Physio DRx (Essilor of America)
• Sola HDV (Carl Zeiss Vision)

Glass is much more scratch resistant than plastic, making the glasses last longer. Plastic lenses are less reflective than glass lenses, making them clearer and less prone to glare. Glass lenses generally have a higher index than plastic lenses, making them slightly thinner and more attractive looking.

• LENS TECHNOLOGIES BY BRAND. OAKLEY | COSTA | MAUI JIM | SMITH | RAY BAN.
• Oakley. Oakley uses PRIZM™ technology in it’s top lenses.
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• MAUI JIM.
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Try to edge it by hand, if it has strips adhered to edge, it’s poly. Hit it with a hammer, if it doesn’t break and bounces, it’s probably poly. If the optics aren’t as clear as glass or plastic, it’s poly.

All you need to do is tap a lens against your teeth, a tool that’s always available. If the lenses make a soft ringing sound, they are more likely to be glass. If they make a soft *thunk*, then they are definitely plastic.

Glass lenses are less likely to scratch than plastic ones. However, you can add an anti-scratch coating to your plastic lenses. Plastic is better for safety, and it’s lighter and more affordable than glass.

Ray-Ban lenses are crafted and designed from both crystal and plastic and are available in both options with almost all design models.

The Varilux Physio CR39 plastic lens is available in this range: -5.50 to +4.00 sphere, -3.00 to +3.00 cylinder, and up to +3.00 add. However, if your prescription exceeds -/+3.00, you should consider a high index lens in order to minimize lens weight and thickness.

How do I know that I have genuine Varilux lenses? Varilux lenses are supplied from the manufacturing laboratory with a Varilux lenses Certificate of Authenticity (COA) card. If you do not receive a COA card with your Varilux lenses, please consult your eyecare professional.

‘, the answer is yes. Here’s why: Bigger lenses ensure you have ample coverage for each prescription. Most types of progressive lenses fit better in large frames, so you’ll need bigger lenses to go with them.

Varilux lenses are progressive lenses, which means that they offer both close-up and distance vision correction, but they feature a more gentle transition between the two than traditional bifocals. Crizal lenses reduce glare for clearer vision and ultraviolet protection.

For some people, Crizal lenses are a worthwhile investment. Reducing glare can make nighttime driving more comfortable and be a big help if you find yourself under bright lights frequently. However, blue light from computers and smartphones has not been proven to cause permanent eye damage.

Crizal® Developed by Essilor, the Crizal® brand offers a complete range of high performance treatments that fits wearer’s everyday life. Crizal® lenses provide protection against glare, scratches, smudges, dust, water and contribute to prevent the harmful effects of UV rays and Blue-Violet Light**.

• Crizal TOI 33. CRIZAL. Experience Crizal lenses for the clearest vision possible.
• Varilux TOI 33. VARILUX. Varilux is the #1 Progressive lenses brand in the world.
• Transitions TOI 33. TRANSITIONS. Transitions lenses are fashion forward and practical.
• Eyezen TOI 33. EYEZEN.
• Xperio TOI 33. XPERIO.
• Optifog TOI 33. OPTIFOG.

What Are the Disadvantages of Progressive Lenses?

• #1: It can take time to get used to wearing progressive lenses.
• #2: Some frames are unsuitable.
• #3: Progressive lenses can cost more than single-vision lenses.

At least part of the reason why Zeiss lenses are expensive has to do with their willingness to use the best optical glass. These glasses are expensive but if your quest is to have outstanding wide open aberration correction, then these must be used.

Progressive lenses are perfect for nearsightedness and farsightedness, but there’s a learning curve and some people never adjust to these lenses. To help your eyes adjust, wear your progressive lens as often as possible in the beginning.