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Blog | Optical Industry Insights, Guides & Tools for Opticians

Actionable insights for opticians and eyewear retailers. Learn how to measure PD remotely, optimize optical workflows, choose the right tools, and grow your business with modern digital solutions.

Online Eyewear Measurement: PD, SH, and Frame Sizing Explained

Online Eyewear Measurement: PD, SH, and Frame Sizing Explained

Short answer: Accurate online eyewear fitting depends on three measurements: pupillary distance (PD), segment height (SH), and frame dimensions. PD errors as small as 1mm can cause prismatic distortion in higher prescriptions; SH errors of 2-3mm in progressive lenses routinely cause non-adaptation. This guide explains each measurement, the tolerances that matter clinically, and where digitalContinue reading “Online Eyewear Measurement: PD, SH, and Frame Sizing Explained”