We offer free basic 1.5 index lenses on most prescription eyeglasses. We provide opportunities to upgrade and add features during checkout. We make shopping online for your glasses simple, efficient and safe
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Best Price Guarantee
If you find a lower price online within 14 days of purchase, we will BEAT IT by $2!!
Many vision care insurance providers cover the cost of prescription glasses, and some of them also cover prescription sunglasses and contact lenses. See more info and how to check if you are eligible here.
Ask our opticians
We have qualified opticians on call to answer your questions and help you choose lenses and frames.
These Montana-Readers R20 eyeglasses come in a stylish Black/Blue . Choose from our huge selection of prescription lenses options to add practicality and convenience to a complete and modern look this season. The item's frame is made of Acetate . Buying Montana-Readers R20 eyeglasses from SmartBuyGlasses includes a 24 month warranty. Discover over 180 designer eyewear brands and more than 80,000 eyeglasses at SmartBuyGlasses ! Plus, enjoy free shipping, free 1.5 lenses for Montana-Readers , 2-year warranty, and the best price guarantee when you shop with us.
Check the measurements inside your current frame for the best match.
Your glasses don’t need to match measurements exactly, use our size ranges to find the best fit.
137.3 mm
29 mm
51 mm
19 mm
Bridge Width
Temple Length
Lens Width
140 mm
Lens Width
Bridge Width
Temple Length
Extra-Small
Below 42 mm
Below 16 mm
Below 130 mm
Small
42-49 mm
16-18 mm
130-135 mm
Medium
50-54 mm
19-20 mm
136-145 mm
Large
55-58 mm
21-23 mm
146-150 mm
Extra-Large
Above 58 mm
Above 23 mm
Above 150 mm
* This is a general size guide reference. Depending on the style of the frame or brand you choose, some variance may occur.
If you don’t wear glasses
You only need a ruler and a mirror. All measurements are in millimeters (mm).
Frame widthMeasure across your face from one side of your forehead to the other, just above your eyebrows.This helps ensure the frame fits comfortably without squeezing or slipping.
Bridge WidthMeasure the width of your nose at the narrowest point between your eyes.A proper bridge fit prevents pressure or sliding.
Temple LengthMeasure from the side of your face to just behind your ear, following the natural curve of your head.This ensures the arms of the glasses sit comfortably and securely.
