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Knowledge Center

FD Knowledge Center

Everything you ever wanted to know about frames, lenses, contacts, eyewear brands, vision, and eye health. Use the menu below to jump to specific sections.

Prescription Eyeglass Lenses

Lens Types

Lens Materials

Lens Coatings & Add-ons

How to Clean Your Glasses & Lenses

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Sunglass Lenses

Sunglass Lens Colors

Sunglass Lens Color Guide

Sunglass Lens Types

Specialty/Branded Sunglass Lenses

Sport-Specific Sunglasses & Lenses

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Frame Shapes

Frame Materials

Designer Eyewear Brands

Frame Style

Frame Selection Help

Special Features

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Contact Lenses

Types of Contact Lenses

Contact Lens Information

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Prescription Information

Understanding Your Prescription

Other Helpful Prescription Links

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Guides & Videos

Guides & Videos

Helpful Articles

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