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
Prismatic test lenses
Lenses used for the calibration of the prismatic deviation measurements by focimeters, in which the prismatic power of each lens is expressed in centimetres deviation per metre distance (cm/m). NOTE: The special name for the unit for expressing prismatic power is the 'prism dioptre' for which the symbol 'd' is used.