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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
frame dimensions
Horizontal and vertical lens sizes and bridge width as defined by the boxing system. Specification of the frame dimensions in orders for individualized progressive lenses exactly defines the fit of the finished spectacles in front of the wearer's eyes.