How to choose lenses?

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

Lens Thickness/ Lens Index

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

Lens Colour

Photochromic & Transitions® Lenses Introduction

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

Difference between Spherical Lens and Aspherical Lens

Lens Functions

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

Do you have prism lenses?

Do you offer bifocal or progressive lenses?

Do the lenses include any coating?

How to use progressive glasses?

Spherical VS Aspherical Lens (video)

What type of bifocal lens do you use?

What is the material of your lens?

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

What kind of lenses do you offer and what kind of lenses do you not offer?