P
- pantoscopic angle
- perimeter
- perimeter decibel scale
- peripheral field
- permanent engraving
- photochromatic material
- photochromic fatigue
- photochromic lens
- photochromic material
- photoretinits
- plano lens
- plastic frame
- plus-power lens
- polarizing lens
- positiv lens
- power
- power, equivalent
- predecentration
- primary position
- Principal curvature direction
- principal meridian
- principal meridians of a surface
- principal power
- principal section of a prism
- printing
- prism base
- prism dioptre
- prism reference point
- prism thinning
- prismatic deviation
- prismatic effect
- prismatic power
- prismatic power lens
- prismatic power prism
- Prismatic test lenses
- progression zone
- progressive power lens
- progressive power semifinished lens blank
- progressive side
- progressive surface
- progressive-addition lens
- progressive-addition semi-finished lens blank
- projection perimeter
- protective lens
prism thinning
Property of a lens prism with a vertical base setting which allows reduction of the thickness of a progressive-power lens or E-line mulitfocal. NOTE1: Both lenses of a pair should exhibit equal prism thinning. NOTE2: The prism-thinning value should be specified when ordering one lens of a pair, to avoid introducing relative vertical prism.