How to choose the appropriate lenses 

That is, you need eyeglasses what for ?

Possible answers, to correct:

Distance vision only requires single vision lenses (clair or tint or photochromic with just one focal correction for distance vision  

Near vision only requires single vision lenses (clair, or photochromic, or tint) with 1 focal correction for near vision like reading, computer work, or driving  

Progressive lenses are required for sistance, intermediate, and near vision corrections altogether. They are- also known as varifocals or multifocals . May come clair, photochromic or tint. Progressive lenses are currently replacing biifocal lenses given that they have no visible horizontal line in the middle and deliver a smoother transition between farsightedness and shortsightedness. 

Free Form progressive hi-tech lenses (clair or photochromic or tint) also for distance, intermediate and near vision are programmed individually on their rear surface near the eye, at the user's specifications and the frame size. Free Form lenses offer an extremely high vision accuracy.         

            Further details available on “About Lenses and Frames” on the menu control bar.