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 point position
Vertical and horizontal fitting distances and directions of the fitting point from the boxed centre of the lens shape.