Ophthalmic lens synthesized from its specifications

Details Ophthalmic lens synthesized from its specifications Ophthalmic lens synthesized from its specifications

G - Physics

02

C

G02C 7/02 (2006.01) A61F 2/16 (2006.01) B29D 11/00 (2006.01) G02B 3/08 (2006.01) G02C 7/04 (2006.01) G02C 7/06 (2006.01)

Patent

CA 2304764

This invention relates to a novel prescription lens (58), mainly suited for ophthalmic applications. The lens designer defines the macroscopic surface of the lens (59, 60) as desired. The design process assumes that the location of the object (50), the lens (51), and the required image (53) are known. By using Ray-tracing technique we calculate the macroscopic normals to the lens that will form the required image. From those macroscopic normals we calculate the macroscopic surface by a process of summation of the slopes with geometric pattern conditions. The final surface is not smooth but contains plenty of dense macroscopic shapes that look like saw-teeth. The rough surface enables the lens to have almost any desired shape and thickness.

L'invention concerne un nouveau verre (58) médical qui convient principalement pour des applications ophtalmiques. Le concepteur de verre définit la surface macroscopique du verre (59, 60) selon les besoins. Le procédé de conception implique que l'emplacement de l'objet (50), le verre (51) et l'image (53) requise sont connus. On calcule au moyen d'une technique de lancer de rayons les perpendiculaires macroscopiques au verre qui formeront l'image requise. A partir de ces perpendiculaires macroscopiques, on calcule la surface macroscopique par un procédé d'addition de pentes et d'états de motifs géométriques. La surface finale n'est pas lisse, mais contient de nombreuses formes macroscopiques denses ressemblant à des dents de scie. Cette surface inégale permet de produire un verre pouvant présenter presque n'importe quelles for me et épaisseur voulues.

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