Originally Posted by
Youngerman
I recieved an email from a optometrist ask these questions below, I not sure what is ment by the second question, maybe you have some thoughts or idea as to what is being asked. If know the answer to these questions your input would be appreciated.
Reagrds
Youngerman
Hoping you can help again;
Grey
Grey 3
Grey 3 - how is different from a normal grey, and was there ever a Grey 2
One more question If I may:
I understand deeper colours are more likely to fall foul of the traffic signal detection requirements,ie Q factors. I believe dark brown lenses, in particular are a problem and at 15% transmittance many brown lenses would fail.
Is it true that polaroid browns in sunglasses were OK, but no longer available
I wonder historically has the term Polaroid always referred to polarising (ie has a company Polaroid ever existed and or has the brand Polaroid been produced with coloured lenses that were not polarised)
How do we measure for Q factors-most instruments I know of measure UV absorption and visible transmittance etc
Peter
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