First of all, for clarification purposes,  just because glasses are dark does not mean you are being protected from UV rays.  In fact, your eyes can be damaged by cheap sunglasses with dark lenses that do not have UV protection because your pupils dilate and they let in more of the harmful UV rays. 


I have the transitions (auto darkening) and have Aphakia (No lense in my eye).  My glasses are VERY thick, like coke bottle thick (and I paid extra for the thinest they could make).  13 or 14 is the RX.  I could only find one place that could make my strong RX.  The transitions work great.  Cost me over $1200.00 and they even told me that they gave me a discount.  Also took a month to get them in. 

My biggest problem with them is that it is very nauseating to wear them outside.  It feels like a funhouse mirror effect where everything is wavy.  Almost like I'm walking around trying to look through a magnifying glass and walk.

Most prescription glasses have a coating that helps to cut out the UV light. However, I do believe it is an option that has to be paid for. My prescription is stronger than yours but it has something that makes it thinner.

I wear large sunglasses that fit over my glasses.

https://www.amazon.com/Solar-Shield-Fits-Over-Polycarbonate-50-15-125mm/dp/B000LWJCJW

They are quite large, and even so, not large enough. The inside of the sunglasses have scratches where the edges of my frames has been contacting them. Because of that, I usually have to replace the sunglasses every year or so.

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