How to choose lenses?

Lens Thickness/ Lens Index

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

Do you have prism lenses?

Difference between Spherical Lens and Aspherical Lens

How to use progressive glasses?

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

Do the lenses include any coating?

Do you offer bifocal or progressive lenses?

Lens Functions

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

Lens Color

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

Photochromic & Transitions® Lenses Introduction

Which kind of lenses are free?

What type of bifocal lens do you use?

Spherical VS Aspherical Lens (video)

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

What is the material of your lens?