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Eyeglasses lenses ,Damaged by scratching



Ophthalmic lenses are the part of your glasses that improves your eyesight and allows you to see. There are several characteristics that make your lenses unique for your glasses. Our practice prides itself on being the only clinic in Sioux Falls to order its lenses through HOYA. We feel HOYA offers superior products, which leads to a higher quality vision.

Lens Type​s:

1) SINGLE VISION - Most common lens. Used to correct nearsightedness or farsightedness with or without astigmatism. Lens that is designed to correct vision for one single distance (usually vision is corrected for distance, as those under 40 can still accommodate to focus their vision and clear objects up close without the need of a bifocal, trifocal or progressive addition lens).


2) BIFOCAL - Used to correct distance refractive error (nearsightedness, farsightedness, and/or astigmatism) through the top part of the lens and age-related near refractive error (aka presbyopia) through a segmented or lined area at the bottom part of the lens. See figure 1.

3) TRIFOCAL - Similar to a bifocal, but this lens option corrects vision at three focal points with two segments at the bottom of the lens. The top of lens is still for distance, but then the next segment is made to correct intermediate (or about arms-length) distance. The lowest segment is made to correct near vision. See figure 2.

4) PROGRESSIVE ADDITION LENS (PAL) aka NO-LINE BIFOCAL - This lens choice corrects distance, intermediate and near vision without having the segmented or lined areas that are so noticeable on the bifocal and trifocal options. See figure 3.

Lens Designs:

1) Standard versus Digital Single Vision -


2) Straight Top versus Round Bifocal - 


3) Trifocal and Other Options - 


4) Types of Progressives - 


5) Computer/Office Lens -


6) Anti-fatigue Lens - 


7) Golf Progressive Lens - 




Lens Materials:

1) Glass -


2) Plastic - Also known as CR-39 or 1.50 lenses. These lenses are the most cost effective lens that we offer. While these lenses have excellent optics they are thicker and easier to chip and crack than its alternatives. 


3) Polycarbonate - These lenses were developed in the 1940s to be a lightweight and highly impact resistant. They are also thinner than both plastic and trivex lenses. They are often chosen for safety glasses, sports glasses, and children's lenses. 


4) Trivex/Phoenix -  Trivex lenses are also light weight and impact resistance but were developed more recently in the 2000s. Hoya Trivex lenses are the best option we offer for safety and children's glasses. Hoya Trivex lenses come with build in UV coating to protect from sunlight. 


5) High Index Plastic - 

Lens Coatings/Tints/Extras:

1) Anti-Reflective Coating - Hoya anti-reflective coatings are applied to the surface of the lenses to help reduce glare, provide a scratch coating, and prevent smudges on lenses. 

      a) Ex3 - Complete UV protective, more scratch resistant than glass, and clearer            vision (Oil, Water and Dirt Don't Stick).

      b) Recharge - Blue Light Filtration, Glare resistant, Scratch Resistant, Smudge               Resistant. 

      c) HiVision - UV protection, Scratch Resistant, and Smudge Resistant. 

2) Scratch Coating - 


3) UV Coating - 


4) Solid versus Gradient Tints -  


5) Mirror Coating - 

6) Blu Tech Lenses - 

7) Photochromatic Lenses - Lenses that darken on exposure to UV light. 


      a) Hoya Sensity - Available in Silver Grey, Bronze Brown, Emerald Green. 

             - Hoya also offers Sensity Fast, fades quicker when moving from outdoor to indoor environment, Sensity Dark, provides patient with darker            lenses when outdoors, and Sensity Shine, includes a mirror coating that is more intense in the light and subtle indoors. . 

       b) Transitions - Block 100% of UVA and UVB rays and also filters harmful blue    light indoors and outdoors. Transitions are available in Sapphire, Amethyst, Amber, Emerald, Gray, Brown, and Graphite Green. 

8) Polarization - 

Other Lens Features:

1) Lens Thickness - 


2) Base Curve - 


3) Lens Shape -


4) Lens Parameters/Measurements -  

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