# Pantoscopic tilt: measurement and convention

Pantoscopic tilt describes the vertical tilt of the frame front in its wearing position, relative to the instrument or procedure reference.

## 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 An earlier photograph may no longer represent the current position.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](https://www.zeiss.com/vision-care/us/eye-health-and-care/understanding-vision/whats-the-difference-between-individualized-eyeglass-lenses-and-off-the-shelf-lenses.html)

## Related topics

- [Vertex distance: record the wearing position](https://lensas.com.br/en/knowledge/vertex-distance/)
- [Optical centration: from measurement to fitting](https://lensas.com.br/en/knowledge/optical-centration/)

Educational content · Fictional examples · Automated technical review, no claimed clinical validation.

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Version: 2026-09-15.1