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  • Category: Opinion About

    Are polarized lenses better than photochromatic lenses for UV eye protection?


    confused between using polarized and photo chromatic lenses for UV eye protection? Looking out for more details like difference between these types, advantages and cost? No worries, check out this Ask Expert page and get answers to your questions.

    When purchasing sunglasses we look for ones with lenses which provide protection against UV radiation. I asked my ophthalmologist and she advised having ones with polarized lenses and to put in the lens number of my specs which I use for distance.

    I have heard about lenses which are polarized and those which are photochromatic. My queries are:
    1. What exactly is the difference between these two types?
    2. Do either of these types really offer 100% UV protection?
    3. Is there any specific advantage of one type over the other for UV protection?
    4. Is one type more expensive than the other?
  • #150097
    Polarized lenses will bring down the effect of glares. They screen the harmful UV rays, In addition to that, they block reflections that are originated from rain, snow, water, etc. Once this happens, our vision will get improved and it will be more clear. If we use only sunglasses on the water there is no chance for us to see in it.
    Photochromic lenses adjust and go on readjusting as necessary to the level of light surrounding us. Hence, they're recommended for situations where the light constantly changes or for anyone who doesn't want to constantly change their lenses.
    Polar glasses are good for driving in the rain, coming down the slopes, so and so forth. Anywhere where there is a glare, polarized sunglasses are ideal. Since they increase our vision.
    The benefits of photochromic lenses are very well known. When we have sunglasses or any type of photochromic eyewear, we immediately relish the power of convenience. You never have to change your glasses simply because the clouds rolled over or the rays of sunshine.
    Photochromic lenses are also beneficial for different situations. If we are hiking up glaciers, the weather can change throughout the day. None will go with different goggles to the mountain, they are stuck if the day becomes darker or sunny. In such situations, photochromic lenses will definitely help.

    drrao
    always confident

  • #150117
    Sunglasses are used for protection of eyes from UV. Generally, good quality sunglasses will provide adequate protection so one should check the quality and brand of sunglasses before purchasing them. The UV radiation is comparatively more in snowy outdoor conditions than that of dim and shaded places. Still it is recommended that sensitive people should use sunglasses even in shaded place to protect from scattered UV from high rise buildings.

    Even the good sunglasses cannot provide good protection as scattered UV can enter the eyes from the sides so it is advisable to use wraparound type glasses for better protection. The price depends on the quality and brand and some glasses may be prohibitively costlier.

    The Polaroid lenses are basically for combating the glare which indirectly helps in reducing the scattered UV radiations.

    While using these protections one must ensure that the quality of glasses should be very good.

    Knowledge is power.

  • #150119
    Many people around the world use sun glasses to enjoy safely the sunlight and keep their eyes safe from the deleterious effects of the rays from sun. Currently both lenses are sold claiming to serve this purpose.

    1. What exactly is the difference between lenses which are polarized and those which are photochromatic.?

    The polarised lenses are ones that have a reduction in glare and the amount of light passing throught it. Photochromatic lenses are ones that reduce the glare and uniquely darken to reduce the amount of light passing through based on the level of light outside in the atmosphere.

    Photochromatic lenses get activated by reacting to the amount of UV light (hence indoors, the lenses remain clear as the UV is very minimal, outdoors it starts to darken). The coating on the polarized lenses acts like a filter that allows only light waves vibrating in a single direction. Hence the image we see is more darkened. In simple terms, the more bright the sunlight, the more darker the lens would be.

    2. Do either of these types really offer 100% UV protection?

    If you are buying a pair specific to UV radiation filter, chose the one or ask for one that has UV filter code of 380, ideal would be 400 because this means 100%. Do not go for a polarised lens for good UV protection.

    3. Is there any specific advantage of one type over the other for UV protection?

    The photochromatic ones are better to people with sensitive eyes and to be used in places with stronger sunlight and higher levels of UV radiation.

    4. Is one type more expensive than the other?

    Yes the photochromatic ones, especially the UV 400 ones are more expensive than the polarized ones. There are many brands that are available online starting from Rs:500-800. I would suggest going to a reputed dealer or a known optician who can give you a genuine product. The other advantage with photochromatic lens is that we can have it custom made based on our eyesight correction power. If you are going to be exposed to sunlight for long hours, then you can choose a wrap-around model, that shuts the light coming from the sides/angles too.

  • #150128
    Polarised Lenses are meant for the reduction of glares so as to have the distinct image of the object without having any distortion of their original image. The ultra violet rays are detrimental to the eyes and as such these Lenses have designed to arrest such effects.
    In respect of popularity, both the Lenses - the polarised ones' and the Photochromatic ones' enjoy similar attractions with slight variations in their usages.
    Photochromatic Lenses are ideal for both the indor activities and out- doors ones'. It will filter the high amount of the ultra - violet - Ray's apart from making the focus of the objects more distinct in respect of view ability. With the exposure of Sun - Ray's outside, the colour of the lenses would adjust itself and more the brighter is the Sun, the more darker will be the lenses soothing to the eyes and at the same time takes care of glares.
    On cost angle, the Photochromatic Lenses, capable of absorbing high UV are costlier than the polarised one but one must insist on purchase of the branded ones because of their superior qualities in terms of anti glares and adjustments of vision depending upon surroundings.

  • #150135
    A virtually invisible filter can be built into lenses to eliminate the amount of reflecting light that enters the eye. Sunlight reflecting off of smooth water, snow or flat roads can create glare which is not only annoying, but can often be dangerous. Blinding sun glare can cause accidents, snow blindness and can even sunburn your eyes. Long term exposure to sun glare has been known to cause cataracts. Thankfully, polarized lenses can shield you against the dangers of intense glare. Polarized lenses not only reduce glare, they make images appear sharper and clearer, increasing visual clarity and comfort. Most polarized sunglasses provide UV protection which is important to maintaining healthy eye sight. Just as we put on sunscreen to protect our skin, it's critical that we protect our eyes from UV rays too. Lastly, polarized lenses relax your eyes and stop looking in vivid light situation, thus reducing eye strain and wrinkles.
    Photochromic lenses are in many colors. Photochromic lenses is available in single vision, bifocal, varifocal forms. You get visual inside and outside comfort with wearing photochromic sunglasses. When the lenses are exposed to light, the photochromic molecules in lenses begin to change the structure absorbing more light and eventually darkening the lenses.


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