HIGH INDEX 1.60, 1.70, 1.80
Hi Index allows for the thinnest and lightest lenses with the most precise optics as well.  The lenses are flatter and thinner at the edges, and eliminates peripheral distortion and improves your vision.  Another cosmetic advantage is they make your eyes look more natural.  High "Plus" prescriptions tend to make your eyes look bigger, and High "Minus" lenses make your eyes look smaller. 
Hi Index lenses reduce these properties caused by your high prescriptions.

High Index 1.60 is recommended for prescriptions higher than a combined +/- 3 diopters combined sph & cyl.
High Index 1.70 or 1.80 is recommended for very high prescriptions, usually for over +/- 6 diopters combined sph & cyl.

Fixed tints are denoted by a darkness shade of #1 or #3.
#1 is a light tint, about 15% darkness, for a slight cosmetic appearance.  #1 tint is not too dark for night activities, including driving at night.

#3 is a dark sunglass tint, to be worn as a sunglass only.

PHOTOCHROMATIC GLASS
As the name implies, these lenses are photochromatic (darken or lighten in color automatically based on the sun's brightness).   Many people are familiar with photochromatics in plastic lenses with most popular brands being Transitions™ & Sun Sensor™.

The brand names for glass are Photogrey Extra (PGX) or
Photobrown Extra (PBX).  PGX & PBX are available in mid index or thinner, flatter 1.60 hi index glass lenses.

PHOTOGREY THIN & DARK GLASS™ (Mid Index)
Corning Thin and Dark glass lenses are photochromic (darken automatically based on the sun's brightness when outdoors).  They get darker in warm temperatures than Transitions (plastic). Being glass lenses, they are much more scratch resistant than Transitions.  Thin & Dark lenses are made from a patented process from the Corning Company that allows them to be ground to a very thin target 1.5 mm center thickness, yielding a lens that is up to 30% lighter and thinner than standard glass.

POLARIZED SUNGLASSES
Available in mid index or 1.60 hi index glass

Polarized glass lenses offer tremendous advantages to the user, and they are the premium sunglass lens.  In addition to blocking 99% of the suns damaging UV400 rays, they also block glare for better vision and less eye strain & fatigue.

Driving fatigue is reduced--Much of the light reflected from large pavement is polarized, so people who do a lot of daytime driving will benefit from polarizing lenses.

Fishing and other outdoor water activities enhanced--Light reflected from the surface of the water prevent the viewer from seeing below the surface. Polarized lenses not only eliminate this glare, but enables the wearer to see below the surface as well. Also, sand at the beach is a source of this same glare.

Snow is very reflective--People who are out working or driving in the snow will see the benefit from using polarized lenses.

A polarized lens is a true optical filter which only allows the useful light traveling from the object viewed to reach the eye, while blocking all the glare caused by the scattered light traveling in many different random directions. When objects are viewed through a polarized lens, they appear sharper. Colors are seen more vividly and in true natural proportion, due to the removal of the scattered white light. When the glare is eliminated, the eyes don't have to work as hard or squint to see. This reduces eye strain. The result is a sunglass which actually is soothing to the eyes.

Simply put, Polarized lenses offer visual acuity & comfort unavailable in any other sunglass.

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