[Pro-Tip: Try the subscription plan instead. You'll get up to two replacement pairs per year if damaged. And you get one lost-replacement each year; and that means you can stop your subscription after a year, keep your "lost" pair, and have paid less overall than buying a pair. A subscription is a win-win.]

Hemo-Iso lenses isolate and enhance visibility of blood concentration variations under the skin. As a result, both blood-pooling and poor circulation become perceptually enhanced. Used by wound care and urgent care specialists for  augmented perception and early identification of cellulitis erythema, poor peripheral circulation, diabetes detection, rashes and hives, bed sores identification, and bruising from trauma and abuse. Bright light -- no glare -- is recommended with use.

Try the subscription plan instead and you'll get replacement pairs if damaged or lost. It's a win-win. 

About the product:

• UV protection
• Anti-static, anti-fog, and anti-scratch coatings.
• Lightweight and fully adjustable
• Exceeds ANSI Z87.1 impact standards
• Patented by two U.S. scientists
• Made in the U.S.A.

O2Amp technology is passive, not providing its own light; good lighting is, therefore, crucial to its function. A headlamp is recommended (at least 60 lumens). Do NOT wear Hemo-Iso lenses on or near roadways as they may make traffic signs and signals invisible to the eye.