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Decenter
| Глоссарий терминов и сокращений по оптическим линзам |
- To place out of center.
- To remove centering or shoring.
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Decentration, английский
The act of moving the optical center of a lens away from the geometric center of a shape or frame for the purpose of aligning the optical center over the pupil. the lens may also be displaced away from the wearer’s line of sight for the purpose of creating prismatic effect. degree (?) – the 360th part of the circumference of a circle. the unit used for specifying the position of the axis of a cylinder or the location for the base of a prism.
Datum line, английский
- A line at the midpoint between the top and bottom of a lens, also referred to as the 180? line. unless otherwise specified, optical centers are ground on this line. “dbc” – distance between centers. “dbl” - distance between lenses – the closest distance between lenses. the figure is needed to compute decentration and is measured from the closest nasal point of one lens to the closest nasal point of the other lens. this measurement may be different that the marked bridge number on the frame.
- Базовая линия; база; ось координат
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