Doesn't replacing the lenses with your own rx defeat the purpose of the glasses?

If a person wore corrective lenses, it would be smarter for them to get the coatings offered by their optometrist.So changing the lenses out of these glasses would just give you ugly frames..........

How do you know what magnification to select?

You can select the magnification power by clicking the "Size" dropdown list on this product. It is a bit confusing by naming it as "Size" instead of "Power". I select 2.5 which is the same power for my father's reading glasses and it worked very well.

Exactly how much blue light do these anti blue light lenses block? 50% 98%

From what I have research, I found a sight that has ratings from all the different types of glasses and they have these ones to be: Wave Lengths 400/425/450/480/520/570 - 95%/50%/20%/15%/5%/0%

what does Size: 53-16-140 mean?

The three numbers are listed in millimeters. The first number is the width of each lens, the second is the width of the bridge (the area between each lens) and the third number is the length of each of the arms. http://www.framesdirect.com/include/information/frame_size_guide.aspx

GAMMA RAY OPTICSGamma Ray Blue Light Blocking Glasses Amber Tint Anti Glare UV Digital Eyestrain

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