# Optical centration: from measurement to fitting

Centration positions lens references relative to the eyes and adjusted frame, following the lens design and manufacturer instructions.

## What to record

Organize monocular measurements, fitting heights and right/left identification. Optical centre, fitting cross and reference point are not interchangeable for every design.

## Verification workflow

Adjust the frame, record measurements, verify orientation and send the context to the laboratory. After mounting, check physical references and wearer comfort.

## Limit

A generic fitting height does not replace the progressive design guide. The public tool organizes concepts; mounting approval requires professional verification.

## 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

- [Pupillary distance: which measurements should you record?](https://lensas.com.br/en/knowledge/pupillary-distance/)
- [Frame geometry: A, B and bridge](https://lensas.com.br/en/knowledge/frame-geometry/)
- [Pantoscopic tilt: measurement and convention](https://lensas.com.br/en/knowledge/pantoscopic-tilt/)

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

Canonical: https://lensas.com.br/en/knowledge/optical-centration/
Version: 2026-09-15.1