Polycarbonate or High Index Plastic Material for Rimless Glasses

londoner2009

Is there a way to tell what material my glasses are from a photo?

I ordered my first pair of Rimless glasses from an online site - but I'm not 100% sure if they sent me the glasses in the material that I ordered - the package included no paper work just the glasses and a case and cleaning cloth.

I took some photos - can anyone tell from the photos if the lenses are what I ordered?

My prescription is -5.00 in both eyes and the lenses are small 49mm wide - in some photos I've also place my old glasses with the purple frame next to them for comparison.

I don't know what material my old glasses are made from - but I think they might be 1.67 Index material

For the Rimless Glasses I paid over £30 extra for High Index 1.67 lenses but I think I may have been sent 1.59 Polycarbonate lenses. Polycarbonate was only about £15 extra.

Things such as my LCD screen or computer keyboard appear to bulged outwards with the new rimless glasses, but they appear perfectly flat with the old glasses.

Is there a way to tell if these rimless glasses are Polycarbonate or High Index Plastics from the photos?

https://www.dropbox.com/sh/cvdgmady5js4h1a/AABKjj2Uzfko2BbdA73Ew4P3a?dl=0

Ikamva

Not all 1.67 index lenses are created equal. The cheaper 1.67 lenses will reduce thickness by 30% but the more expensive 1.67 lenses will reduce thickness by 45%.

I would send them back and explain the bulging, that is not normal.

kirtondm

The bulging is likely to be due to diffrent centration or lens design.

If the prescription is fairly stable and the frame the same size and the centration is the same and the index is the same it should look similar.

You have to be more careful ordering higher prescriptions online as errors can be magnified.

How did they calculate the centration? - If from the old lenses should be the same if you supplied a centration may be diffrent from your old ones.

Polycarbonate is an awful lens material it is very soft and difficult to work - I would personally only use it for saftety eyewear as has the highest inpact resistance.

It will pretty difficult for you to tell if it is polycarbonate or high index plastic by inspection.

GlasweJen

Too difficult to tell from photos. To me it looks like they might be polycarbonate as they aren't coated and I've never heard of a 1.67 being uncoated as the higher density material can cause more distortions in the lens and the MAR coating reduces that significantly.

If you tilt your glasses in the light is there a green or purple tinge to the lens?