LENS DESIGN

EDGE THICKNESS MINUS LENTICULAR DESIGN

With high minus lenses the edges 
become too thick and uncomfortable.  
In this case a second curve is cut in 
the periphery on the front surface of 
the lens to thin the edge.  This is 
called a minus lenticular lens.

For hydrogel lenses, due to their large diameter, this is necessary for low minus lenses.  For RGP lenses over about -5.00 D to -6.00 D a lenticular cut is needed.