Single Vision Lens:

An ophthalmic lens designed to provide correction for only one viewing distance. Single vision lenses are available in plastic CR-39 & mineral lenses. Their Index start from 1.49, 1.55, 1.6 and Hi Index 1.71 . Higher Index (1.71) is thinner and lighter weight lenses, which make it better & elegant, look.

Bifocal:    

An ophthalmic lens designed to provide correction for two viewing ranges; for example, distance and near.

Progressive Addition Lens :

An ophthalmic lens designed to provide correction continuously rather than discretely as in a bifocal or trifocal.

The HOYAlux Wide premium progressive addition lens features a generous, undistorted reading and distance viewing area plus a wide, clear and smooth intermediate zone of transition between the distant and reading areas of the lens.

Polarized Lenses:

Contain a powerful polarizing filter that eliminates 99% of horizontal glare and provides 100% UV protection. They allow just the right amount of light to enter the eye to enhance peak visual acuity.

Polarized lenses virtually eliminate the problems of reflected glare. Color perception is more accurate and natural than with other sun lenses

The result:
the eye functions in perfect balance, reducing fatigue and eyestrain

Photo chromic (Changeable Color):

The photo chromic agents in these lenses will darken when the lenses are exposed to UV radiation and lighten when the lenses are removed from the UV.

Typically, the only time that sufficient UV is present to activate the lenses is outdoors where UVA and UVB combine to provide the lighting elements necessary to fully activate Transitions Lenses. 

Fewer Reflections, Better Vision :

An anti-reflective coating consists of several ultra-thin layers applied to the lens in high-vacuum conditions. The physical properties of the anti-reflective coating have been computed so that the reflected components of the light suppress or cancel each other out. The higher the quality of the coating, the more effective this will be.

A lens with a multi layer, anti-reflective, for example, reflects only approximately 0.5% of incoming light instead of 5%. And the less reflection there is, the more light is transmitted to the wearer's eyes - and the better vision becomes.

   
Roll mouse over photo too see the difference

Without an anti-reflective coating, many reflections

With an anti-reflective coating, practically no reflections and clearer vision