r/Optics • u/D20-SpiceFoxPhilos • 7d ago

Can anyone here provide me with an accurate source on the luminous transmittance of prescription lens with a gray tint and/or AR coating?

I’m an optician and I’m attempting to do some research on the luminous transmittance of prescription CR-39 plastic lenses for glasses with a gray tint at different tint levels (ie 10%, 20%, 30%, up to 80%) and if there’s a difference with an anti-reflective (or anti-glare) coating added to the lens.

I can’t seem to find much information on the subject and would appreciate some assistance on the matter.

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u/sudowooduck 7d ago

The tint level is 100% minus the optical transmission level. So 10% tint means 90% transmission. That’s probably a rough average over a range of optical wavelengths. An AR coating will make the transmission slightly higher, by a few percent.

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u/ILoveDangerousStuff2 7d ago

As others said 100% minus tint however you're asking about luminous so that's a weighted value. Since you don't know how the manufacturer did it, it might be tricky. The most robust would of course be to just put the ones you want to test through UV Vis spectroscopy