Understanding Your Eye Prescription: SPH, CYL, and Optical Jargon Explained
How to Understand Your Eye Prescription: SPH & CYL Explained Stepping out of a high street opticians with a fresh piece of paper can feel confusing. Rows of boxes, positive signs, and negative signs look intimidating. Acronyms like SPH, CYL, and ADD make the grid hard to read. However, learning how to understand your eye…