And I might add, both surfaces are not only reflecting blue pretty strongly, but also UV as shown on the noviolens.com video.
And I might add, both surfaces are not only reflecting blue pretty strongly, but also UV as shown on the noviolens.com video.
Last edited by Dr. Bill Stacy; 09-08-2015 at 09:29 AM.
Yes the underlaying substrate is the main factor. If you can manage to add the right absorbers into it you might just do it. However there is also a hurdle to take into consideration and the is the thickness opf the coating.
The end result is still and will be forever, the amount and wave length of the light transmitting the surface........versus.........the amount of light and wave length that exits the lens surface on the backside.
Solution:
Know what is hitting the surface, and measure what is coming out on the backside.
Deleted.
Last edited by Judy Canty; 10-01-2015 at 10:26 PM.
Very funny video Judy. Hey Chris, the substrate is not at all important to the blue waves who never get to it due to the thin film that mostly reflects them before they can get there. But yes, light making it past that barrier can be greatly or minimally affected by absorption.
Keep an eye on your mailbox. 9 lenses coming your way, shipped a week ago. Have fun.
I'm hearing anything from 60% to 80% of the visible blue, pretty much ignoring anything that claims 100%.
Most lens companies make claims like, "blocks 40% of the blue light" without providing a transmission chart so you can see transmission rates at specific portions of the spectrum.
When you wear blue reduction lenses it becomes apparent there is very little color content in the 380nm to 400nm range. It is more of a glare/brightness that irritates your eyes.
We had our Chemistrie Blue clip lenses tested by an outside testing lab and they block over 99% through 390nm, 96.5% at 395nm and 86% at 400nm. From there, the numbers decrease to 50% at 410nm, 30% at 425nm and 22% at 450nm. They taper down to approximately 10% at 500nm. We have tested tinted computer lenses that have done slightly better from 380nm to 420nm but unfortunately, customers tend to dislike the tint.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3144654/
Interesting article on damages of light.
- Optician
- Frame Maker/Designer
- Teacher of the art of crafting handmade eyewear.
Here are some Spectrometer graphs from lenses Dr,Bill Stacy sent me. There were 12 lenses, too much to put on OptiBoard, so I set up a page on my website and you can get to it at the following link :
There are currently 1 users browsing this thread. (0 members and 1 guests)
Bookmarks