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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

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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

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Prescription Information

Understanding Your Prescription
Vision & Eye Health
Other Helpful Prescription Links

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Guides & Videos

Guides & Videos
Helpful Articles

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Our Certified Opticians are available to help you find your perfect eyewear, confirm your prescription, and answer any other questions you may have. Please complete our contact us form.
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International Customers Call +1 512 402 8557
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