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Terms and Conditions

Lens Thickness/ Lens Index

What is the difference between single-vision and bifocal/progressive lenses?

How to choose lenses?

Photochromic & Transitions® Lenses Introduction

What coatings and add-ons do you offer for your lenses?

Lens Color

Can I buy lenses only to fit into my old glasses frame?

Do you offer bifocal or progressive lenses?

What're the difference between Tint lens, Photochromic lens and polarized lens?

Difference between Spherical Lens and Aspherical Lens

How to use progressive glasses?

Do the lenses include any coating?

Which kind of lenses are free?

Spherical VS Aspherical Lens (video)

Do you have prism lenses?

Lens Functions

What's the difference between basic coated lenses, standard coated lenses and blue-light blocking lenses?

How to change the lens of safety/sport glasses?

What is the material of your lens?

What type of bifocal lens do you use?