How to choose lenses?
Lens Thickness/ Lens Index
Photochromic & Transitions® Lenses Introduction
What is the difference between single-vision and bifocal/progressive lenses?
Lens Color
What're the difference between Tint lens, Photochromic lens and polarized lens?
What's the difference between basic coated lenses, standard coated lenses and blue-light blocking lenses?
Lens Functions
What is the material of your lens?
Difference between Spherical Lens and Aspherical Lens
Which kind of lenses are free?
How to use progressive glasses?
Do you offer bifocal or progressive lenses?
Do you have prism lenses?
What coatings and add-ons do you offer for your lenses?
Can I buy lenses only to fit into my old glasses frame?
How to change the lens of safety/sport glasses?
Do the lenses include any coating?
What type of bifocal lens do you use?
Spherical VS Aspherical Lens (video)