Home > Industry/Domain > Security & protection
Security & protection
Related to services concerned with the conception, production and implementation of security and protection systems.
0Categories 757Terms
Add a new termContributors in Security & protection
Security & protection >
Lens blank
Eyewear; Optometry
Piece of material, usually preformed, for the making of a lens at any stage before completion of the surfacing processes.
Horizontal centre line
Eyewear; Optometry
Line located at equal distance from the two horizontal tangents of the boxing system.
Infrared radiation
Eyewear; Optometry
Optical radiation with a wavelength longer than that of visible radiation.
Focal length
Eyewear; Optometry
Distance in an optical system from the focal point to the corresponding principal point, measured along the optical axis (axis of symmetry).
Fixed-location stimulus perimeter
Eyewear; Optometry
Perimeter which utilises test stimuli that are at permanent locations on the background.
Fixation target
Eyewear; Optometry
Target used to locate the point where the patient should look during testing.