| 摘要 |
An apparatus comprises a series of light-emitting diodes (S1 to S80), transmitting light rays transformed by lenses (C1 to C80 and L1), into a beam of parallel rays (R1 to R80). Said rays (R1 to R80) are picked up by a lens (L2) and converge at the focal point (F'2) thereof in the plane of a position sensor (3). When a corrective lens (7) is placed at the rear of lens (L2), the impact of rays (R1 to R80) on said corrective lens is distributed over an array of small squares defining measurement areas. An electronic displacement detector (5) digitalizes the analog signals transmitted by the sensor (3) and a computer (6) performs a topometrical analysis of the corrective lens (7). The invention is useful for automatically performing a topometrical analysis of multifocal or progressive corrective lenses without displacement of said lenses.
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