Some properties of the Jackson cross-cylinder in Figure 1. (a) The

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William HARRIS, Professor (Full), BSc(Eng) MS PhD BOptom HonsBSc, University of Johannesburg, Johannesburg, uj, Department of Optometry

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Some properties of the Jackson cross-cylinder in Figure 1. (a) The

William HARRIS, Professor (Full), BSc(Eng) MS PhD BOptom HonsBSc, University of Johannesburg, Johannesburg, uj, Department of Optometry