Once you have experienced the incredible difference that good eyeshades can make, you will want to have a good set of prescription lenses made. They will be very expensive, but you wear them everywhere and the comfort is surely worth it... Of course - if you are lucky enough to still have 20:20 vision you can buy the 73mmx2mm "Plano Lens Blanks" from NoIR. You need part numbers 01L and 07L (equivalent to 901 and 907, respectively). Unfortunately these are not available to prescription, just as plain filter lenses.
 
Look around for a pair of frames with large lenses and leather side pieces to keep out light from the sides. Don't bother too much about the quality of their lenses - you will be discarding them. I use the Aviator style Ray-Ban L2846 and L2821 frames (62mm) with the custom leather 'Alpine' side-shields that are available in Europe. The bottom of the large frame sits on my cheeks, cutting out most of the light which might enter from ground and shirt reflections.
 
When you have the frames then you have to find an optometrist who can fit them with the lenses for you. If you can afford the Zeiss Skylet Sport lenses then I recommend getting anti-reflective coatings on both the front and the back. The standard Skylet Sport density is suitable for indoors use, but a double density 97.5% coating will be needed for driving. Make sure you get glass lenses for driving, as the Polycarbonate do not attenuate the InfraRed light. Zeiss Tital 1.7 U85 GE is a very nice glass lens that has been made for me with double density (97.5%) U85 Umbra coatings. This works out fairly well. I use Progressive Multi-focals ("Gradal HS") in the Skylet Sport polycarbonate for inside use. Only the single vision is available in the glass (which is what I use when when driving).
 
The optician in my local Walmart has consistently produced the best prescription for me. I then have a cheap pair of normal glasses made to check the prescription, and then send it to my optometrist in Denmark. He gets the lenses made in Germany, Austria and Italy. I live in California. I have found it no trouble to send the prescription halfway around the world and wait for the glasses in the mail. The ability to live and function knowing that each day will be fully productive far outweighs any inconvenience...

Trevor

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