Night driving glasses

[Spexxvet]

Originally Posted by busterb

Thanks, Spex for that info.

My pleasure!

[Beest]

About a year ago ordered some cheap yellow lens glasses fro winter driving, but they came from China on the slow boat and didn't arrive until after the snow had gone.

I tried them at night and they made a bit of difference but not much,
they were great in the rain on the highway with all the spray.

and today I got to try them in the blowing snow, they were very helpful, made things clearer and less eye strain.

[Beest]

"Yellow 'Night Driving' lenses have been shown to provide no benefit in seeing ability at night. They are even hazardous, because they give the driver a feeling of seeing better, which no one has yet been able to explain. Studies have shown that they actually impair visual performance and retard glare recovery. Many promoters have made unfounded claims for the ability of amber to improve night vision. They have employed mass solicitation, usually by mail. The Federal Trade Commission has correctly ruled that such practices are illegal since the lenses do not perform as claimed." - Forensic Aspects of Vision and Highway Safety", Merrill J. Allen, O.D., Ph.D., Et al.

From http://www.laramyk.com/resources/edu...iving-glasses/

Why would feel you can see better if you can't.

Surely the perception that you can see better, means you are perceiving better.

[glatt]

Don't know if they still do, but French cars used to have yellow headlights for presumably the same reason.

[BigV]

Leaving the discussion of color aside, polarized lenses really can make dramatic improvement by reducing the glare from the wet roads.

[glatt]

Agreed. Polarized lenses are amazing.

[monster]

All my sunglasses are polarized. Makes such a difference

[busterb]

We'll no glasses at walmart, fred's and 2 welding supplies. Next check is a truck stop. Damn I hate to go to eye Dr. and pay big bucks for something that may not work.

[Spexxvet]

Originally Posted by footfootfoot

I thought it was to keep the bugs away. hahaha

I understand the point of yellow and amber lenses is to filter out the portions of the blue spectrum which doesn't do it for us humans (spexx, weigh in here?) and they are mostly effective at twilight or on overcast days.

I'm thinking overcast days must have more blue light (higher color temp. I'll look that up) and by filtering it out things seems brighter because we see blue light as darker?

maybe?

They increase the contrast and that alone takes strain off the eyes. In B&W photography those color lenses help to render the sky a darker shade of gray since B&W film is somewhat more blue sensitive than our eyes.

Yes. I'll just add that the blue light that reduces visual acuity is from scattering. Scattering happens when nice crisp rays of light hit gas, like the atmosphere, which causes them to wiggle, and move into the blue wavelength range. Yellow counteracts the blue, and polarization eliminates almost all of the wiggles that are not in the vertical plane. Glare is light waves not in the vertical plane.

Originally Posted by BigV

Leaving the discussion of color aside, polarized lenses really can make dramatic improvement by reducing the glare from the wet roads.

The only negative about polarized lenses is they can cause problems viewing some electronics.

Originally Posted by busterb

We'll no glasses at walmart, fred's and 2 welding supplies. Next check is a truck stop. Damn I hate to go to eye Dr. and pay big bucks for something that may not work.

Walgreens has a "as seen on TV" area. I think I've sen them there.

[Spexxvet]

BTW, it's not what we're discussing here, but High Energy Visible light (HEV) is the new UV. Studies have shown that HEV light from screens can do all kinds of harm to people.

http://www.bluelightexposed.com/#what-is-bue-light

[lumberjim]

Hold up. Pm me your address. I've got a pair I can send you

I kept your Christmas card, but can't find the envelope

[lumberjim]

Nevermind. I found it in a PM from Feb 2009. Hope you haven't moved since

[Clodfobble]

Originally Posted by Spexxvet

The only negative about polarized lenses is they can cause problems viewing some electronics.

Also tinted windows on cars, and windshields which are themselves polarized. I had to get rid of my polarized prescription sunglasses because every time I drove I was surrounded by rainbows all the time like I was high on LSD, then I'd cock my head 45 degrees to the side and suddenly everything in front of me would get much lighter and blind me, then I'd get out to pump gas and couldn't read the damn display at the pump and had to take my glasses off, except then I couldn't see so I had to lean in and squint... I'm much happier just living with a little glare.

[sexobon]

Originally Posted by Clodfobble

... then I'd cock my head 45 degrees to the side and suddenly everything in front of me would get much lighter and blind me, ...

I'm guessing the lenses were linearly polarized. I wear only sunglasses with circular polarization with which that doesn't happen. The illumination level through the lenses remains constant with changing viewing angle. They're also photochromic (lighten and darken automatically).

[busterb]

Well I had to return my glasses to eye DR. because the wonderful Va or someone screwed up. Anyway I looked at Wal-mart.No luck, but I did find a HD visor from the as seen junk. Best I can tell, if you have any kind of head on wreck, it'll take the top of your head OFF.
But wait, there's more. A big headed, good hearted guy from the pot hole state of PA. sent me some shades and a clip-on. I've yet to thank him. But I will.