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30. The exact solution for the centre thickness of spectacle and contact lenses. de Faria e Sousa SJ, Ventura L. Ophthalmic Physiol Opt; 1996 Mar; 16(2):184-6. PubMed ID: 8762782 [Abstract] [Full Text] [Related]
31. Generalization of the Tscherning theory: optimization of aspheric ophthalmic lenses. Le Texier F, Lenne W, Mercier JL. Ophthalmic Physiol Opt; 1987 Mar; 7(1):63-72. PubMed ID: 3658427 [Abstract] [Full Text] [Related]