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Development and Testing of a Compact Autorefractor Based on Double-Pass Imaging.
Linus Emmerich1, Arne Ohlendorf1,2, Alexander Leube1,2
1Institute for Ophthalmic Research, Eberhard Karls University Tuebingen, Elfriede-Aulhorn-Str. 7, 72076 Tuebingen, Germany.
Sensors (Basel, Switzerland)
|January 8, 2023
Summary
A new compact autorefractor uses double-pass imaging and digital processing for objective eye measurements. This technology offers a feasible, low-cost solution for determining refractive error, aiding in myopia management.
Area of Science:
- Ophthalmology
- Optical Engineering
- Biomedical Imaging
Background:
- Rising myopia prevalence necessitates accessible refractive error assessment.
- Traditional autorefraction requires patient feedback or expert practitioners.
- Objective, low-cost refractive measurement devices are needed.
Purpose of the Study:
- To develop a compact autorefractor for accessible refractive error measurement.
- To utilize double-pass imaging and digital image processing for objective analysis.
- To analyze spherical and astigmatic defocus accurately.
Main Methods:
- A compact autorefractor was designed with minimal optical components.
- The device employs double-pass imaging and point-spread function (PSF) analysis.
- Digital image processing was used to determine refractive error parameters.
Main Results:
- The autorefractor accurately measured spherical defocus (±15 D) and astigmatic defocus (-3 D).
- Reliable results were obtained across the tested measurement range.
- A slight increase in deviation was observed at high refractive error values.
Conclusions:
- A PSF-based approach is feasible for compact, low-cost autorefractors.
- The developed device offers a viable solution for objective refractive error measurement.
- This technology can improve accessibility to eye diagnostics, especially for myopia.
