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jlcd
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Im selecting sunglasses for the holidays. How come brown sunglasses will filter blue light? How about green sunglasses? it's supposed to filter some blue light.. how much and why?
Calaver said:From what I've seen from looking a few things up, it looks like that rose colored sunglasses also filter blue light. In addition, orange colored safety googles filter UV light. If you think of the electromagnetic spectrum, or even rainbows for that matter, this begins to make sense. Brown (just a darker shade of orange typically), orange, and red light all lie to one side of the spectrum, while blue and UV light are on the other side. And light is either reflected or absorbed when it hits a surface; what is reflected is not absorbed and vice versa. So, what happens with orange (or brown) or red colored things is that they reflect orange (or brown) or red and absorb blue and possibly (depending on the material) UV light. In the end, this results in you seeing the reflected light, and not seeing the absorbed light when you look at the object.
I'm not sure about green, as it lies more in the middle of the spectrum so I hypothesize that it would filter less blue light than brown sunglasses.
Also, if you're looking at polarizing lenses, that's a whole different concept.
It's a similar effect but polarization doesn't necessarily depend on the color of the lens. For instance, here are some red lenses that are (advertised to be) polarized:jlcd said:Yes. It's polarizing lenses. I initially got the brown.. the visual is clearer than average because it's supposedly filter all blue (removing all haze).. but I changed it to green because brown only good for older people. But it's same concept as what you described above. Is it not? I know polarizing lens block all horizontal light.. but this is separate from the colors and blue filtering?
It's worth while pointing our that it's not so much an 'elimination' of all planes but one because that would end up with very little light getting through. When light passes through a polariser, the polariser selects just the component of the wave(s) in a particular plane. It actually let's through half of the energy of unpolarised light.Calaver said:polarization deals with eliminating all but one plane of vibration for electromagnetic waves. R
Blue light is a type of visible light with a short wavelength and high energy. It is emitted by the sun and artificial light sources such as electronic devices. While blue light is essential for our circadian rhythm and regulating sleep patterns, overexposure to it can lead to eye strain, headaches, and even long-term damage to the eyes.
Brown sunglasses have a special coating that filters out blue light. This coating is made up of several layers of material that selectively block blue light from passing through the lenses. This allows for a more balanced and comfortable level of light to reach our eyes.
Filtering blue light with brown sunglasses can provide a variety of benefits. It can reduce eye strain and fatigue, improve sleep quality, and protect the eyes from long-term damage. Brown lenses also provide better contrast and enhance visual acuity, making activities like driving or playing sports safer and more enjoyable.
No, not all brown sunglasses filter blue light. The effectiveness of the blue light filter depends on the quality of the lens coating. It is important to choose sunglasses from a reputable brand that specifically advertise blue light filtration.
No, brown sunglasses cannot filter blue light completely. While they can significantly reduce the amount of blue light reaching our eyes, they cannot block it completely. Some amount of blue light is necessary for our overall health and well-being. However, brown sunglasses can provide a good balance and reduce the harmful effects of overexposure to blue light.