Eye Prescription Symbols: How to Understand Test Codes?
Understand eye prescription symbols like SPH CYL Axis PD ADD and 6/6 so you can read test codes and choose the right lenses with more confidence
Eye Prescription Symbols
What Is SPH in an Eye Prescription and How to Read It
Learn what SPH eye prescription means, how to read positive and negative SPH values, and how they affect lens thickness, comfort, and clarity
Eye Test Symbols: What Do They Mean in a Prescription?
Learn what eye test symbols like SPH, CYL, Axis, PD, ADD and Prism mean in your prescription and how they affect your glasses lenses before choosing new lenses