Light and Heat Sensitive Lenses

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Ophthalmic lenses that change color depending on the intensity and amount of UV rays are called photochromic. While these lenses become transparent with the reduction of UV rays indoors, they darken when exposed to the sun.

It would not be correct to define photochromic lenses as "sunglasses" due to their darkening in the outdoor environment. Because while sunglasses are the same color and dark in every environment and under every light, the intensity of the darkening in the color of photochromic lenses varies depending on many factors. It is not the right approach to advise users to use photochromic lenses "in place" of sunglasses. However, photochromic lenses have a darkening function that can be considered as an alternative to sunglasses in the outdoor environment. For this reason, the advantages of photochromic lenses with the darkening function should be explained to the users very well and clearly by the optician.

The color change rate of photochromic lenses by being exposed to different external conditions varies not only according to the amount and intensity of the light, but also to whether the light comes directly or by reflection, the temperature, the environment, different times of the day and the geography. For this reason, it is necessary not to match photochromic lenses with sunglasses lenses that always remain the same dark, regardless of external conditions.

At this point, photochromic lenses help the user to continue to work comfortably with the same glasses instead of taking off their glasses and using a separate sunglasses, thanks to the dimmer function in the environment where the amount and intensity of light increases. Likewise, when entering the interior or when the light decreases in the outside environment, the color of the lens will not be required to change glasses again. For this reason, using photochromic glass is very practical for many users. However, the user should be made clear that this does not mean using photochromic glasses instead of sunglasses.

Photochromic lenses darken with the effect of direct sunlight when going outdoors, and some darkening occurs on the glasses of the glasses while the user is in the car. However, due to the UV filtering feature of the windows of the vehicles, darkening will not be the same as in the outdoor.

The most important reason why users of prescription glasses that provide correction of refractive defects prefer photochromic lenses is that they can easily use these glasses in sunny weather and in the car. Many people prefer to wear single glasses without constantly changing glasses with their photochromic glasses that darken and open when they change the environment, instead of carrying prescription sunglasses with them. Especially for users who are affected by the sun and are uncomfortable, photochromtic lenses that protect their eyes from the harmful effects of UV rays are ideal and provide them with a clearer vision and ease of use.

Different photochromic lenses can be used according to user needs. There can be photochromic lens providing single vision vision, as well as bifocal (bifocal) or multifocal chromatic glasses that provide multi-focal vision.

Photochromic lenses are especially ideal for users who enter and exit a lot between indoor and outdoor.


Written and visual contents under the title PHOTOCROMIC were compiled from different sources for suggestion and information purposes. This content does not constitute definitive diagnosis and treatment. Please consult your doctor in case of any health problem. Do not forget that the treatment methods applied in health problems may vary depending on the biology, hereditary characteristics of the individuals, age, height, weight differences, allergic aspects and many different conditions. Your doctor can always help you in the treatment of your health problems.

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