GAMMA RAY FLEXLITE GR OG-003-C1 Computer Readers Glasses With 0.00 Magnification in Flexible Frame Anti UV Blue Light and Anti Harmful Glare by Gamma Ray Optics, Free size

Q: 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.

Q: 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%

Q: 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

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产品编号: 735615102

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描述

Amber tinted lenses to minimize Digital Eye Strain caused by harmful blue light emitted from digital screens; Great for alleviating visual fatigue and discomfort from long periods of web surfing, gaming and working under fluorescent lights; Ultra light weight and flexible TR90 frame material for long term use and durability; Includes frame carrying case and cleaning cloth; Your computer reader magnification/power depends on how far you are from the screen you are viewing. For a laptop or desktop About 19+ inches away, select a magnification HALF your normal reading power. For a smartphone, tablet or a book about 12 to 18 inches away, select your normal reading power