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Thread: Polarized sun glasses

  1. #16

    Polarized sun glasses

    Light from the sun is for the most part evenly distributed. That is if you take a camera and look at any direction in the sky. Its light meter will have about the same reading. The reading will be different if you point your camera at the sun. I check this by standing with the sun at my back and looking through my camera at different parts of the sky.

    Another thing about light is that. Light are small packets of energy that have wave like properties. Polarization allows certain light waves to pass while reflecting others.

    If one was to take a long rope. Hold it at one end. And then move your hand up and down very quickly. The rope would make a wave like motion. The motion would be in the vertical plane only. But if you move your hand side to side you could make the wave move in the horizontal plane. Light moves along with the same motion. Some light waves are vertical some are horizontal. The truth it that in nature the light waves move along in a 360 degrees pattern about the center axis. Although reflected light that comes off a smooth surface tends to have a higher number of waves in the horizontal plane (glare).

    Polarized sun glasses reflect the horizontal plane (glare) light. Some glasses will reflect all of the glare light. Some will not. Some will reflect some of the light that is between the vertical plane and the horizontal plane. Some will not.

    All this talk and I have not even addressed the effects that different lens material has on color. Which will also effect what you see.

    One thing that I can say for sure about any pair of polarized sun glasses. Is that they act on light the same way from either direction. That is if you glasses go a great job of reflecting unwanted light from the front end. They will work the same way for light coming in over your shoulder and hitting the glasses from the rear. Which in some cases can reflect a lot of that unwanted light directly in to your eye. Some sun glasses try to address this through design.

    Long story short. All sun glass are not created equal. How much glare you see somewhat depends on you glasses. I use a pair of polarized sun glass here in the south west. I like them for most riding conditions. I don‘«÷t know if I would choose to ware them on rainy days. Or if my roads had lots of oil on them.

    Tinted windows tend to separate the vertical light waves into their colors. Polarized sun glasses allow you to see those colors. When I ware my polarized sun glasses I tend to relax and enjoy the light show. Although I do notice some eye fatigue due to color separation after a period of time. I guess my brain doesn‘«÷t like seeing things that are a bit different from the norm.

    You can try this at home. Take two pair for polarized sun glass and hold them one in front of the other. Then rotate one pair. The amount of light coming through the glasses should go to zero when the glasses are rotated 90 degrees to each other.

  2. #17
    El Dookey loves to ride. 99007's Avatar
    Join Date
    Aug 2003
    Ada, MI (outside Grand Rapids)

    Thumbs up Thanks for the light lesson

    Now I learned something(s) and I can go to sleep for the rest of the day.
    I wear polarized sun glasses lots. My eyes are blue and very light sensitive, so I feel it is a necssity for me to have them on. This time of year on the road in Michigan I want to know what the best kind of lenses are for spotting pot holes!

  3. #18
    Club President
    Join Date
    Oct 2003
    New York City
    A minor point but polorized lenses don't reflect light any differently than other lenses. The do absorb light that doesn't have the correct wave orientation to pass through the lens material. IOW, polarized lenses absorb unwanted light rather than reflect it.
    Allen Clarkson
    CitiBeemers, NYC
    K12RS '02 IBM

  4. #19

    Re: Polarized sun glasses

    Originally posted by schaeftl

    here in the south west.... Or if my roads had lots of oil on them.
    So where in the Southwest do you live that has elves that come out and scrub the roads at night? Here in Las Vegas, we have some of the oiliest roads in creation, due to the infrequent rains. When we DO get rain, it's so slick that cages collide like bumper cars.

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