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
pantoscopic angle
Angle in the vertical plane between the optical axis of a spectacle lens and the visual axis of the eye in the primary position, usually taken to be the horizontal. Angle between the spectacle plane and the perpendicular. In the individualized progressive lenses, the pantoscopic angle is taken into account in the computation and production of the lenses in each and every case. The angle is measured with the patient’s head and body in a natural posture. Carl Zeiss offers a practical device for easy measurement of this angle. It is automatically measured with the computer-assisted fitting system.