The longest vertical height of the frame is called which measurement?

• A. B Measurement
• B. A Measurement
• C. C Measurement
• D. Eyesize

Answer: (A)

The measurement that corresponds to the longest vertical height of a frame is the lens height (often called the frame height). This vertical dimension runs from the top to the bottom of the lens area and determines how tall the frame sits in front of the eye, affecting fit around the brow and lash line. It’s different from horizontal dimensions like the eye size, which measures the width of a lens, and from bridge and temple lengths, which relate to fit around the nose and behind the ear. So the longest vertical height is about how tall the lens opening is, not how wide it is.