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Thread: Non-Reflecting Costa Del Mar C-Mates Seven Mile Bifocals Sunglasses

  1. #1
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    Dec 2007
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    Default Non-Reflecting Costa Del Mar C-Mates Seven Mile Bifocals Sunglasses

    Do Costa Del Mar C-Mates Seven Mile Bifocals sunglasses have a coating to reduce or eliminate back-glare? That's the light that hits the back of the lenses and bounces into the eyes. The purpose of an anti-reflective (AR) coating is to reduce these reflections off the lenses.
    Similar to a scratch-resistant coating, AR is made of a very hard, thin film that is layered on the lens. It is made of material that has an index of refraction that is somewhere between air and glass. This causes the intensity of the light reflected from the inner surface and the light reflected from the outer surface of the film to be nearly equal. When applied in a thickness of about a quarter of light's wavelength, the two reflections from each side of the film basically cancel each other out through destructive interference, minimizing the glare you see.

  2. #2

    Default Non-Reflecting Costa Del Mar C-Mates Seven Mile Bifocals Sunglasses

    Quote Originally Posted by DebiK View Post
    Do Costa Del Mar C-Mates Seven Mile Bifocals sunglasses have a coating to reduce or eliminate back-glare? That's the light that hits the back of the lenses and bounces into the eyes. The purpose of an anti-reflective (AR) coating is to reduce these reflections off the lenses.
    Similar to a scratch-resistant coating, AR is made of a very hard, thin film that is layered on the lens. It is made of material that has an index of refraction that is somewhere between air and glass. This causes the intensity of the light reflected from the inner surface and the light reflected from the outer surface of the film to be nearly equal. When applied in a thickness of about a quarter of light's wavelength, the two reflections from each side of the film basically cancel each other out through destructive interference, minimizing the glare you see.
    Here's the "blurb" from the Costa Del Mar website:

    Each pair of Costa Del Mar sunglasses features 100% protection from UV A, B, and C rays, 100% polarization, water-repellent coating, and anti-reflective coating. Mirrored lenses are made of top-quality optical glass. Manufacturer’s lifetime warranty.

    So there you have it. Yes, they do have an anti-reflective coating, as do all Costa Del Mar sunglasses, apparently.

  3. #3
    Join Date
    Dec 2007
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    513

    Default

    Quote Originally Posted by Juicer View Post
    Here's the "blurb" from the Costa Del Mar website:

    Each pair of Costa Del Mar sunglasses features 100% protection from UV A, B, and C rays, 100% polarization, water-repellent coating, and anti-reflective coating. Mirrored lenses are made of top-quality optical glass. Manufacturer’s lifetime warranty.

    So there you have it. Yes, they do have an anti-reflective coating, as do all Costa Del Mar sunglasses, apparently.
    Thanks Juicer. So what do you think of my post with all that "destructive interference" stuff?

  4. #4

    Default What Do I Think?

    Quote Originally Posted by DebiK View Post
    Thanks Juicer. So what do you think of my post with all that "destructive interference" stuff?
    I'm thinking "copy and paste."

  5. #5
    Join Date
    Dec 2007
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    513

    Default Yes, You're Right

    Quote Originally Posted by Juicer View Post
    I'm thinking "copy and paste."
    How clever of you, Juicer.

    Where would I be without copy and paste?

  6. #6

    Default

    Quote Originally Posted by DebiK View Post
    How clever of you, Juicer.

    Where would I be without copy and paste?
    Well, you wouldn't know about destructive interference besides the kind brought about by friends and family members.

  7. #7
    Join Date
    Dec 2007
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    513

    Default

    Quote Originally Posted by Juicer View Post
    Well, you wouldn't know about destructive interference besides the kind brought about by friends and family members.
    Yes, it's true that people close to you can bring about "destructive interference."

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