Hi, I have been using photocromatic glasses for the last 20 years, maybe more.- Ever since I discovered on line eyeglasses, I have bought three different pairs, from three different vendors, so I decided to share my experiences in case it helps someone.- 1./ My first pair I bought from Zenni. Paid them about $80. They offer only grey. Aside from a problem I had with the frame, about which I have posted before, the photocromic I bought from Zenni were not good. They change colour from light to dark reasonably fast and they get quite dark (particularly in cold weather). But they quickly showed two problems: a.- The colour is not even until they get a really good share of sunshine. They tend to be "spotted" or "striped" when not in bright sunshine. I have never experienced this kind of problem before.- b.- They always took very long to go back to clear. But, moreover, after only a few months of constant use, they became constantly grey. Currently I have had them in a case inside a drawer for months and when you get them out they still are greyish. They do not go back to completely clear any more. This is a common problem I have found with photocromatics before. After a 3 or 4 years of use they tend to be slow to go back to completely clear and eventually they get stuck in a greenish shade which I dislike. It is not that they will not go dark. They do. But they do not go back to competely clear. But I had never experienced this problem so quickly as I did with Zenni's which I used for only 4 or 5 months before I dumped them.- 2./ My second online pair I bought from Optical4less. Paid them a bit over $100. Really very good glasses. There is a choice of colour, so I chose brown (amber) that I like best. They go dark very quickly and they get as dark as the best I have had. I have been using them for some time now and they still go back to clear perfectly well. Very nice glasses. They turn the precise shade of amber I like best. I used them so much, that I got them pretty scratched (my carelessness), so I started window shopping for a replacement.- 3.- Being sort of a fan of photocromatic, I decided to go for the allegedly very best photocromatic in the market: Transitions V. They are supposed to be darker and faster than any others. Myopticalshop is the only reasonably priced on line merchant who carries them, so I ordered a pair. I paid some $200. Good glasses? Yes. But not worth it. I have had them for a couple of months now and I do not notice a difference with other photocromatics I have had in the past. They are brown. They go dark OK, but they are not really brown but a greyish brown. If you watch the manufacturer's ads (Essilor) this is evident, so I cannot complain. They are completely clear indoors or behind the wind shield. They are fast but I do not see they are really faster than the ones I got from Optical4less. I do not doubt the manufacturer has scores of test to show that they are faster than others (they claim 5 times faster) Maybe they are. I notice no difference. And they cost twice as much as the ordinary photocromatic that Myopticalshop also offers. So my point is they are good, but not worth the difference in price.- Hope the data helps.- GG
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