edge lift


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edge lift

Deviation of the posterior surface of a contact lens from a sphere at a given diameter. This is produced by either the peripheral curve(s) or the edging process. Edge lift provides peripheral clearance of a rigid contact lens, which is assessed by fluorescein pattern. If the edge lift is specified axially (as an extension of the back central optic zone, measured parallel to the axis of symmetry) it is referred to as axial edge lift. If specified radially as an extension along the back optic zone radius it is referred to as radial edge lift. See optic zone diameter; back optic zone radius.
References in periodicals archive ?
The Burke Lift consolidates face and edge lifts in a complete 10-ton system.
The peripheral fit is assessed next; the trial lenses have a standard edge lift, but an increased or decreased edge lift on the same base curve can be ordered.
The flared bottom edge lifts the grip-frame high enough your fingers can more easily slip between the gun and the supporting surface beneath it, for a quick and secure grasp.
Since its launch, it has continued to evolve and now offers enhanced, advanced design features, including toric surfaces and quadrant specific edge lifts.