Pantroscopic tilt is the tilt of the frame front relative to what reference plane?

• A. The plane of the face
• B. The frame face
• C. The corneal plane
• D. The vertical plane

Answer: (A)

Pantoscopic tilt describes how much the front of the frame is tilted forward or backward in relation to the plane of the face. In practice, when you place glasses on the nose, the frame front sits at an angle to the wearer’s facial plane in the sagittal direction, which affects how the lenses align with the eyes as you look up or down. This tilt is referenced to the plane of the face because that plane represents the eye's natural orientation in space; it’s not about the corneal plane or a vertical reference. So the tilt is described relative to the plane of the face.