IPD - Monocular Centration Distance
SEGHT - Vertical P.R.P. height measured from the lower boxed tangent
HBOX - Horizontal Boxed Lens Size of Frame
DBL - Distance Between Lenses
VBOX - Vertical Boxed Lens Size
PANTO - Pantoscopic Angle
ZTILT - Wrapping angle
BVD - Back Vertex Distance
NWD - Near Working Distance