Lens Types

Single Vision
   Provides one range of focus (near, intermediate, or far) according to your prescription or lifestyle needs.  Most people use these lenses for daily living and depend upon them for general vision correction.  Depending on your lifestyle you may need glasses just for reading, driving, computer use, playing the piano, or other occupational functions.  These lenses fulfill these specific purposes as well as correct basic vision deficiencies.

Bi-Focal
   Provides two ranges of vision: far and near.  Part of the lens contains a flat- topped bulge located toward the bottom half in order to accommodate the near-vision field. This enables the wearer to see distance when looking straight ahead or close up when looking down to read.

Tri-Focal
   Provides three ranges of vision: distance, intermediate, and near.  Part of the lens contains a flat-topped bulge split into two parts.  This lens style enables the wearer to see distance when looking straight ahead.  By slightly tilting the head back, you can access the intermediate area for such things as computer use or reading sheet music.  The reading area can be accessed by simply looking down.

Progressive Add Lens (PAL)
   Also called “No-Lines” or “Progressives”.  These lenses provide a continuous field of vision that enable the wearer to see all ranges clearly without sudden power changes that occur with Bi-Focal or Tri-Focal lenses.  There are no visible marks or bulges.  The specially designed lenses enable the wearer to look through a gradual, seamless, power-changing corridor to access an infinite range of focus from distance to close-up.