Do you find switching glasses inconvenient? One pair of eyeglasses for all vision needs – that's what many eyeglass wearers are looking for! Lenses which automatically adjust to all light conditions dramatically reduce the need to switch glasses, significantly boosting the wearer's comfort and safety. There has been a vast increase in the performance and speed of self-tinting lenses featuring leading-edge technology, such as PhotoFusion® from ZEISS. In the production of self-tinting lenses, millions of photosensitive particles are applied to the lens in the form of a coating. These molecules are able to change their chemical structure when exposed to UV light, with the result that the lens darkens rapidly in sunshine and clears again indoors.
It takes just 15 to 30 seconds for lenses with PhotoFusion® technology to darken in sunlight. Indoors, the lenses turn completely clear again within 5 to 10 minutes.
*Average value for 1.67 and 1.6 and for lenses made of polycarbonate. Performance is dependent on the material, temperature and light conditions.
Do you need your glasses all the time? Does it bother you to always have to carry two pairs of glasses at all times so that you can see perfectly indoors and protect your eyes against glare and UV rays outdoors when it is sunny? Eyeglasses with self-tinting lenses can make your life more comfortable, as you always have the right tint for all light conditions in one set of glasses. PhotoFusion® prescription eyeglass lenses with a high or medium refractive index darken in just 15 to 30 seconds in bright light or sunlight*. Indoors, they brighten again in 5 to 10 minutes*, becoming clear enough to see distinctly in a short time. Of course, they also offer 100 percent protection against UV rays at all tint levels.
Are you particularly sensitive to light? You simply have to reach for your sunglasses faster than others. Even though the sun is barely peeping out from behind the clouds, you already find seeing strenuous. Self-tinting lenses can be a wonderful vision aid to reduce the strain on your eyes, as they adapt to the various light conditions almost infinitely. In weak sunlight, they do not become fully dark like sunglasses, so that you can still see well despite the darkening.
You have had a long working day. You wear glasses and have to move between outdoors and indoors frequently for your job. Changing glasses all the time is frustrating and you often forget or do not have a hand free. Your eyes become strained and have a burning sensation in the evening. For you, self-tinting lenses are not a luxury; they can be an important tool, even if your vision problem is minor. Your glasses quickly change from normal eyeglasses to virtual sunglasses as soon as you change move outdoors - and vice versa. You have the right optical tool for every job, and your eyes will appreciate that.
Are you active or sporty? The weather doesn't always cooperate, or the light conditions change frequently during sporting activities. You have no time to change your glasses. Self-tinting lenses mean that you are ideally equipped right from the start for any light conditions that may occur. Your PhotoFusion® prescription lenses change their tint from clear to dark and dark to clear quickly. At the same time, they protect your eyes against the harmful UV-A and UV-B rays, andthe best thing is that they improve contrast and reduce glare.
Children's eyes are even more sensitive to UV rays than adult eyes, as they are still developing and let in more light. As a result, children actually need daily UV protection for their eyes. If your child wears glasses, it can be advisable and far more convenient to give your child glasses with self-tinting lenses. That way you can be sure that your child is protected against harmful UV-A and UV-B rays around the clock and can still see clearly and without strain in every light situation, without having to juggle two pairs of glasses.
One set of glasses for all situations: Just as progressive eyeglasses can save you the trouble of constantly having to switch your reading glasses for your regular glasses, so too can self-tinting lenses save you from constantly switching between sunglasses and normal glasses. Losing, forgetting or not knowing where to put your second pair are now a thing of the past. Concentrate on the moment, and enjoy it – thanks to optimal vision in all light conditions.
Your contact lenses – whether daily, monthly, annual or multifocal lenses – are your best friends. But there are situations for which you need glasses. However, you still want to be as free and active as before, like during sporting activities. Sports glasses with curved and self-tinting lenses can become your best training partners. Whether light or shade, you always have the right tint, UV protection, and can see with more contrast while experiencing less glare. You only need one vision aid for relaxed vision.
The time when self-tinting lenses looked old-fashioned and frumpy is long gone. Contemporary self-tinting lenses, like PhotoFusion® by ZEISS, are available in natural, modern colors - just like normal sunglass lenses. Self-tinting lenses can also be ground to fit any contemporary frames, and can be used in frameless glasses or glasses with curved lenses as well, so that you can fully live out your fashion taste.
We want more flexibility and relaxation, especially when traveling. Accordingly, self-tinting lenses can be a great traveling companion.
However, you should bear in mind that most of the UV rays which activate self-tinting lenses are blocked by car windows, meaning that the prescription lenses do not darken as much there. Although PhotoFusion® prescription eyeglass lenses offer a certain protection against glare in cars, we still recommend wearing "real" sunglasses during long journeys with significantly changing light conditions (like through tunnels).
Photochromic prescription lenses also react to temperature differences. That means that self-tinting lenses darken less in bright sunlight when outdoor temperatures are high. As a result, we recommend carrying sunglasses, particularly in southern regions.
Do you often suffer from eye inflammation, chronic conjunctivitis or dry and sensitive eyes? Maybe you should protect your eyes against bright light and UV rays in particular. Prescription eyeglass lenses which offer permanent UV protection and adapt to light conditions can be a real benefit for you. Your eye care professional can help with your decision.
Special photosensitive molecules are applied during the coating of the lens in the ZEISS production area. Self-tinting lenses use a chemical reaction that was originally discovered in the 1960s and has been continuously enhanced ever since.
The principle behind it all is very simple. When sunlight hits the lens, it increases the surface area of these molecules which makes the lenses darken. The stronger the sunlight or UV light, the darker the lens gets. This means that the right tint intensity is always achieved for the level of light. When the level of UV rays drops, the molecules 'fold' again and the lens becomes clearer. The speed at which the molecules act is a good indicator of the quality of self-tinting lenses.
The ZEISS Progressive Lens Portfolio offers four performance levels and seven technologies, some of which are all-time firsts anywhere in the world. Did you know that the reading distance between our eyes and a smartphone is much shorter than when we read a book or a newspaper?
Your ZEISS eye care professional will be happy to discuss the various lenses featuring PhotoFusion® technology with you. Find a suitable eye care professional here.