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New research · Ophthalmology
Medical & biological engineering & computing · 5d
StudyMedical & biological engineering & computing · 2026

A robot-assisted eye positioning method with high precision and repeatability for ocular particle therapy: mechanical and geometric assessment.

Dequan Shi, Kundong Wang, Yinxiangzi Sheng … Yuze Yang
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OphthalmologyStudy

Robot-assisted eye-positioning system for eye radiotherapy showed very small rotation errors.

A robot-assisted eye positioning method with high precision and repeatability for ocular particle therapy: mechanical and geometric assessment.

Dequan Shi … Yuze Yang
Medical & biological engineering & computing · 2026
Background

Noninvasive ocular particle therapy requires precise eye positioning.

0.25°
Results
0.25°
eye rotation stayed nearly still, matching the intended gaze angle closely
More results

To overcome these limitations, an eye positioning and monitoring system (eye positioning and monitoring system) was developed.

A gaze range analysis algorithm and an occlusion zone analytical algorithm for the beam path and cameras were proposed.

More results

The eye positioning and monitoring system mechanical guidance range reached 360° azimuth and 60.1° maximum polar, while identifying specific exclusion zones.

Stability tests demonstrated cumulative workflow errors were always ≤ 0.22 mm and 0.01° for the guidance module, and ≤ 0.20 mm and 0.1° for the monitoring module.

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Conclusion

The eye positioning and monitoring system demonstrates robust reproducibility, validating its adaptability to conventional radiotherapy environments without requiring dedicated ophthalmology treatment rooms.

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