document.write('
');
document.write('Plus Cyl Tutorial
');
document.write('Ch 1: The Refracting Instrument');
document.write('Ch 2: Introduction to Refracting ');
document.write('Ch 3: Sphere Establishment');
document.write('Ch 4: Cylinder Axis Refinement ');
document.write('Ch 5: Cylinder Power Refinement ');
document.write('Ch 6: Sphere Power Refinement');
document.write('Ch 7: Cylinder Power Search ');
document.write('Ch 8: Conclusion ');
document.write('
Minus Cyl Tutorial
');
document.write('Ch 1: The Refracting Instrument');
document.write('Ch 2: Introduction to Refracting ');
document.write('Ch 3: Sphere Establishment');
document.write('Ch 4: Cylinder Axis Refinement ');
document.write('Ch 5: Cylinder Power Refinement ');
document.write('Ch 6: Sphere Power Refinement');
document.write('Ch 7: Cylinder Power Search ');
document.write('Ch 8: Conclusion ');