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US 6,382,790 B1Granted
Method for producing a multifocal correction lens, and system for implementing same
OwnerDenis Girodinventor
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OwnerDenis Girodinventor
Estimating the term…
The invention concerns a method for producing multifocal correction lenses from semi-finished lenses (1) having at least a first positioning marker M, associated with a correction A called distant vision correction, and a second positioning marker M′ associated with a correction B called near vision correction. The method comprises a step which consists in a surface grinding of the semi-finished lens (1) on an internal surface of said lens. The latter is inclined at a specific angle (β), for example using a wedge, so as to induce a prism of prismatic deviation such that the distant vision and the near vision optical centres are brought together and merge. The invention also concerns a system controlled by a data processing device, for example a micro-computer (8), for automatically carrying out the surface grinding step using a recorded programme and parameters input (80) by an operator.
A method for producing vision correction lenses from semi-finished lenses having a power addition for near-vision correction with respect to distant-vision correction, wherein a mechanical machining that adds a prismatic deviation is performed on an internal face of each lens, through reducing the thickness thereof, and this prismatic deviation is calculated, based on an individual distance between a distant-vision application center and a near-vision application center, in order to bring back the optical correction center in near-vision as close as possible to the near-vision application center.
Dependencies are inferred from the claim text.