2020–2021 BCSC Basic and Clinical Science Course™
3 Clinical Optics
Introduction: Quick-Start Guide to Optics and How to Refract
Part 2: How to Refract
Step 5: Refine Sphere Power
Once you have achieved the optimal cylinder axis and power, recheck the sphere power, as in step 3b.
Excerpted from BCSC 2020-2021 series : Section 3 - Clinical Optics. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.