Pantoscopic tilt: measurement and convention

Consistency

Record degrees with the frame adjusted. Identify the sign convention and reference before comparing measurements from different systems.

Operational example

If the frame was readjusted after capture, recheck the parameters required by the design. An earlier photograph may no longer represent the current position.

Limit

Do not derive a universal fitting height from this angle. Follow the manufacturer and lens design instructions.

References

• ZEISS — Individualized eyeglass lenses

Related topics

• Vertex distance: record the wearing position
• Optical centration: from measurement to fitting