Null screens to evaluate the shape of freeform surfaces: progressive addition lenses.
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DOI: 10.1364/oe.434289
Abstract: We propose a method for measuring the shape of freeform surfaces such as Progressive Addition Lenses (PAL). It is based on optical deflectometry by considering a non-uniform pattern of spots computed by using the null-screen… read more here.
Keywords: freeform; progressive addition; freeform surfaces; shape freeform ... See more keywords