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Question about Lens Materials/Coatings

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Question about Lens Materials/Coatings

Postby rtmcdorman on Sun Jul 24, 2011 8:44 am

I'm planning to buy a pair of AO Aviators, 52mm lens with bayonet temples.

I'd like a brown/amber single-vision Rx lens with my relatively low prescription. In the past, I've had glass, and didn't find it too heavy, but I'm not sure if I should go that way or Polycarbonate (if only b/c poly lenses cost less in this case).

I'll be using the glasses primarily for driving and (maybe eventually) flying, and general outdoor wear (hiking, cycling, etc.)

I have the following questions about the lenses:

Best material? Glass or polycarbonate?
- It's my understanding that glass is the most optically correct and scratch-resistant, but is heavier, and that poly is very good optically/scratch resistance, but weighs less?

AR (anti-glare) coating.
- Just want to ensure it's on the inside lens surface, to prevent reflections of my own eye in the surface of the lens. This is a must. The last pair of Rx sunglasses I had lacked this, and it's very distracting.

- Do polycarbonate lenses need an AR coating inside to prevent that reflection I mention above?

UV protection
I see you recommend this for the CR-39 lenses, because they don't have it.
- Can I assume that glass/poly lenses block UV without this coating.
- This is another must-have, but I don't want to pay for it if it's unnecessary.

Anti-scratch coating
- It's my understanding that glass / poly lenses are highly scratch resistant by nature/design and don't need this.

Thanks in advance for your help.

Roger
rtmcdorman
 
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Re: Question about Lens Materials/Coatings

Postby larumd on Mon Jul 25, 2011 12:59 pm

Thank you for the great questions!

Best material? Glass or polycarbonate?
- It's my understanding that glass is the most optically correct and scratch-resistant, but is heavier, and that poly is very good optically/scratch resistance, but weighs less? This is a correct statement!

AR (anti-glare) coating.
We recommend AR non-glare costing on all materials. For tinted lenses it's applied inside the lenses and on clear lenses it's applied on both sides.

UV protection
If the glass lenses are tinted you will not have to include the extra UV coating. However this is not the case for CR-39. Glass and Polycarbonate will offer the UV protection already.

I hope this helps. Please let us know if you have any other questions or concerns.
larumd
 
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Re: Question about Lens Materials/Coatings

Postby andrewsiddle on Mon Nov 21, 2011 12:07 am

If need optically correct then go with glasses otherwise i'll suggest you to go with poly, so they are lighter in weight and they are optically good.
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Re: Question about Lens Materials/Coatings

Postby larumd on Mon Nov 21, 2011 8:56 am

I agree!
larumd
 
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