A simple setup for measurement of the coherence length ... - laser coherence length
Glasses with lenses that help the wearer see things up close. Many people need reading lenses as they get older due to a common condition called presbyopia.
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Our 365-Day Guarantee means you’re eligible for a one-time replacement pair within 12 months of purchase if there are clear defects in material and workmanship — so be good to your glasses!
We want you to be 100% happy with your eyewear. With 14-Day Free Returns, you can get a one-time replacement or refund within two weeks of receiving your order — no questions asked!
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At EyeBuyDirect, quality eyewear is a guarantee. If you’re not fully satisfied with your glasses, simply contact us for a refund or replacement.
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All single vision EyeBuyDirect lenses come standard with an anti-reflective coating. High-index lenses naturally reflect more light, so this is an important addition if you’re interested in thinner lenses.
An anti-reflective (also known as anti-glare) coating prevents reflections from appearing on both the inside and outside of your eyeglass or sunglass lenses. No reflections on your lenses means more light is reaching your eyes, which inevitably improves your vision.
Blue light filtering lenses filter blue-violet light (blue-violet light is between 400-455nm, as stated by ISO TR 20772:2018 and can accelerate aging of the retina) emitted mainly by the sun outdoors and indoors through windows, plus some artificial light sources like digital screens and fluorescent lights.
Our 365-day product guarantee allows a one-time replacement pair of eyewear within 12 months, if any defects in the material or workmanship are found that prevent you from enjoying your frames to the fullest.
Anti-reflective coating glasses lenses are practically invisible, so your eyes will look better and your stylish frames can take center stage.
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Our 14-Day Fit & Style Guarantee allows an equal exchange or return within 14 days of purchase — no questions asked. And to make it even better, enjoy free shipping on orders over $119 (including designer brand)!
Glasses with Transitions® lenses automatically darken in sunny conditions and become clear when it’s darker. This allows them to work as both eyeglasses and sunglasses.
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Glasses with single vision correction lenses. They help with seeing either at a distance or near, depending on the wearer’s needs.
Progressive lenses are a type of bifocal lens that features a gradual change between near and distance vision correction. The premium version offers a wider field of vision.