Ultra lite style lenses are also known as "High Index". These lenses are thinner and lighter than normal lenses.
What are the advantages of Ultra Lite Style Lenses?
Your glasses weigh less, which provides you with more comfort. You can choose from a larger selection of frames. Your lenses will bulge less from the frame. If you are farsighted your eyes will appear less magnified.
Are Ultra Lite Style Lenses available in glass and plastic?
Ultra Lite Style Lenses are available in hard resin plastic, polycarbonate plastic (extra impact-resistant), and glass.
Your glasses weigh less, which provides you with more comfort. 
