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The Refracting Tutorial by Todd Zarwell, OD, FAAO Refracting / Retinoscopy Simulator

Plus Cyl Tutorial Chapter 1: The Refracting Insrument Chapter 2: Introduction to Refracting Chapter 3: Sphere Establishment Chapter 4: Cylinder Axis Refinement Chapter 5: Cylinder Power Refinement Chapter 6: Sphere Power Refinement Chapter 7: Cylinder Power Search Chapter 8: Conclusion Minus Cyl Tutorial Chapter 1: The Refracting Insrument Chapter 2: Introduction to Refracting Chapter 3: Sphere Establishment Chapter 4: Cylinder Axis Refinement Chapter 5: Cylinder Power Refinement Chapter 6: Sphere Power Refinement Chapter 7: Cylinder Power Search Chapter 8: Conclusion