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Thread: Front Surface MAR

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    Front Surface MAR

    First post for a lurker:

    Could anyone offer me their esteemed opinion on lenses, where only the front surface of the lens is MAR coated and the back surface is not. How does this affect their 'Anti-reflective' properties? Are they any use for any everyday purpose, such as VDU use or driving?

    Many Thanks for your help in advance....Great Site BTW!
    Last edited by Red5; 12-01-2011 at 10:35 AM. Reason: poor grammar...sorry

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    ABOM Wes's Avatar
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    Half of the reflections come from each surface, so you're cutting the total reflections by 50% by only AR coating one surface of the lens. Just curious, why would you not coat both surfaces? The only time I don't coat both is with sunlenses, which I do a backside only to reduce reflections from behind.
    Wesley S. Scott, MBA, MIS, ABOM, NCLE-AC, LDO - SC & GA

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    Hi Wes

    I am asking the question on behalf of a friend who is lloking into supplying lenses where he is receiving them with the coating on the front and then surfacing the back surface.
    As you say the only time I have come across one surface being coated, was on sun lenses to reduce the reflections from behind, I was just curious to know if front surface MAR only would have any benefits to a PX.

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    Is MAR coating English for AR coating?

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    Doh! braheem24's Avatar
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    Quote Originally Posted by Wes View Post
    Just curious, why would you not coat both surfaces?
    There are manufacturers that make frontside A/R coated semi-finished blanks, It makes one hellava shortcut.

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    Reasons
    1. Faster service, start with a stock SF blank with AR , surface the back, presto done.
    2. Usually coated in very large batches by people who do only AR which, in my opinion, results in better and more uniform quality.
    3. While not as effective as two sided I have been told by folks in the know that it's more than 50 % better.

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    ABOM Wes's Avatar
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    Gonna charge half price for that?
    Wesley S. Scott, MBA, MIS, ABOM, NCLE-AC, LDO - SC & GA

    “As our circle of knowledge expands, so does the circumference of darkness surrounding it.” -Albert Einstein

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    I agree with Wes here, why not just coat front and back?

    If I had to choose only one side I would say its more important to coat the frontside, but the backside is almost just as important in my opinion, especially for driving. It significantly reduces the reflections and halo's you see on the temporal edge backside of the lens every 2 seconds from those tall highway lights you pass along at 90mph... On your way to never never land...

    Also im still a little guy learning many things in this industry, what is MAR? general Anti-Reflective?
    Last edited by PhillyEyes; 12-01-2011 at 06:05 PM.

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    Multicoat A/R??????? I was wondering as well? Hmmmmm???

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    Thanks for all the replies....MAR stands for Multi Anti Reflection coating....As far as I am aware it became a general term when the number of layers on an Anti Reflection coating were increased for various reasons....Don has hit the nail on the head with these lenses, being a stock lens with the coating on both sides and then the back side is surfaced. This means the job is turned around much quicker. I am asking on behalf of a friend who was looking at this process, I was/am just curious as to how it would affect the optical properties and if there would be any issues with industry standards etc.

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    Most AR's are not layered anymore, the anti-reflective chemicals are usually applied in one single batch.

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    I don't think its a good idea to apply AR to one side only. You will dissappoint the patient and dissappointed patients are bad. Unless you are lenscrafters, they would disagree with me. I am sure they looked at the same thing once.

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