Progressives lenses are invisible (no-line) multifocals. The prescription power changes gradually from distance prescription on upper portion to reading prescription on bottom portion. It essentially performs similar to a trifocal, but with a smooth transition from distance to near.
About Plastic Lenses:
Plastic lenses are made with a material called CR39 Optical Plastic.
Least expensive lens
Only recommended for prescriptions of + / - 2.00 and below.
50% lighter and less breakable than glass lenses.
Scratch resistant coating is available as uncoated plastic lenses scratch very easily.
Note: Plastic Lens cannot be used for Drilled Rimless Frames. Choose Polycarbonate or Hi Index Lens for Drilled Rimless Frames.
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