Hoya bluecontrol lenses
any one know about Hoya bluecontrol lenses, what percentage of blue light they block?
herf last edited by herf
First, I am a fan of good AR coatings - when you see less ambient light reflected from the room, it makes it easier to look at a screen, and they let you use a screen at lower levels at night too.
However the marketing for most of these lenses says that the transmittance of the coating blocks a lot of "harmful" light - and this is not so.
20% is just not an interesting number to block, because it has almost no physiological impact. You'd want 90+% like sunglasses do.
In most cases you can tell by the color or darkness, and it should be pretty dramatic!
If you want a lens to block more than 20% of "blue light hazard" it has to be visibly yellow, or dark like sunglasses.
If you want a lens to block more than 20% of "circadian" light it has to be dark yellow, preferably orange or red.
@herf so you mean they block only about 20% ... so weak .
herf last edited by
Yes, this entire category seems to be trying to do "something", but to avoid having the lens be visibly yellow. This was possible with UV blocking, but it's simply not true for blue light.
To block blue light, you need a filter that changes color or intensity.
Can you please include Hoya bluecontrol lens in your filter tests of fluxometer to be more accurate and scientific?