A new low-cost, compact, auto-phoropter for refractive assessment in developing countries

Scientific Reports
Babak AmirsolaimaniN Peyghambarian

Abstract

Using a phoropter to measure the refractive error is one of the most commonly used methods by ophthalmologists and optometrists. Here, we demonstrate design and fabrication of a portable automatic phoropter with no need for patient's feedback. The system is based on three tunable-focus fluidic lenses and thin-film holographic optical elements to perform automatic refractive error measurement and provide a diagnostic prescription without supervision. Three separate lenses are deployed to correct the defocus and astigmatism. The refractive error is measured using a Shack-Hartmann wavefront sensor that calculates the Zernike values of an infrared wavefront emerging from the eye. Holographic optical elements steer the emerging wavefront into the wavefront sensor, while simultaneously providing an unobstructed view for the subject. The power of each lens is controlled by pumping a liquid in and out of the lens chamber using servo motor actuated diaphragm pumps. Spherical and cylindrical correction range of -10 to +10 diopters with 0.1 diopter increments is achieved in less than 15 seconds using wavefront sensor feedback to the pumps. This system can be used in rapid screening of large patient populations especially in the developing...Continue Reading

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Citations

Oct 9, 2019·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Marcos RubioEduardo Lage
Mar 5, 2021·Biomedical Optics Express·Güneş AydındoğanHakan Ürey
Sep 9, 2020·Progress in Retinal and Eye Research·Ji-Peng Olivia LiDaniel S W Ting
Jun 19, 2021·Applied Optics·Erol OzgurN Peyghambarian
Oct 12, 2021·Ophthalmology and Therapy·Yee Ling WongTariq M Aslam

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