If the windscreen inhibits UV levels sufficiently, there may not be enough UV to activate the tint in the glasses. This is due to the fact that most windscreens come fitted with some UV protection in the glass. Transition lenses may not react, however, when driving a car. Transition glasses were formulated to take the hassle out of changing glasses for outdoor and indoor tasks.
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When indoors, Transitions lenses become clear again, meaning you can watch TV or read a book without the tint disturbing your vision.
Transitions lenses produce a pale tint on overcast days, with the tint becoming darker as higher levels of sunlight occur. UV rays are present even on cloudy days and these rays can damage your eyes if experienced for prolonged periods. Transitions glasses don’t only produce a tint on glorious summer days. Glasses that can rest on your face for the whole day are much less likely to go astray. Switching glasses is not only irritating, but can also increase the chance of a pair being left in a cafe or restaurant. This can be tiresome, especially if you are going from shop to shop on a hot summer’s day and can’t see price tags due to the tint on your sunglasses. This means users don’t need a separate pair of prescription sunglasses, as the transition lenses will form a tint to shield their eyes on sunny days. Transition glasses are different from standard lenses as they develop tint when exposed to UV rays. So, Transition glasses always receive a scratch resistant coating. After the lenses are coated with the photochromic liquid, they can scratch very easily in their raw state. When exposed to UV light, the molecules become energized and activated and cause the lens to darken. Once the liquid has dried, the lenses are UV sensitive and will change from clear to dark. The lens acts like a sponge, absorbing the photochromic material into the top layers. A liquid containing millions of photochromic molecules is applied to the front surface of the lenses after they are heated gently so that the lenses become porous. Transition glasses are produced in a sterile, dust-free manufacturing environment so airborne particles and dust do not lodge in the lens material. Transition lenses use photochromic technology to assist user vision through a range of light condition, which will darken when exposed to ultraviolet light. You'd better visit an eye doctor and ask some suggestions for the sake of your eyes.Transition glasses are equipped with transition lenses which are a brand-specific type of photochromic lenses.
Third, since you recently had cataract surgery in both eyes. And usually, progressive lenses are more expensive than single vision lenses. And you can decided which lenses you choose single vision lenses( the lens can only help distance vision, intermediate distance vision or near vision) or progressive lenses ( some people called it no-line bifocal lenses that can help you all vision distance).
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S/he knows how to deal with your eyeglasses. And you needn't do anything, just take your prescription to an optician. After an eye examination, you shall got a prescription, on which wrote your distance vision (DV) and near vision (NV). Second, it seems you didn't have a good understanding for your prescription. That because the progressive have very narrow vision zone that people can see through for intermediate vision. However, if you spend lot of time on computer, i suggested to buy a pair of computer eyeglasses instead of progressive lenses to help you see intermediate subjects. To achieve it, progressive lenses are recommended for your eyeglasses.
it seems that you need eyeglasses to help you correct distance vision, middle distance vision and near vision.
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