F
- Field of Illumination
- field of view
- field of view, photographic angular field of view
- finished lens
- first principal meridian
- fitting
- fitting height
- fitting point
- fitting point height
- fitting point position
- fixation
- fixation target
- fixed-location stimulus perimeter
- flat plano prism
- flat-top segment
- focal length
- focal point
- focal power
- Focimeter
- focusing telescopic device
- frame dimensions
- free working distance
- front surface
- front vertex focal length
- front vertex power
- full aperture trial frame
- full-aperture trial case lens
- Fusion
fitting
Distance fitting is recommended for the individualized progressive lenses,and for all Carl Zeiss progressive lenses. Normally, the centration crosses should lie on the pupil centers in the zero gaze direction (distance PD), with a natural head and body posture.