Agarwala R, Leube A, Wahl S. Utilizing minicomputer technology for low-cost photorefraction: a feasibility study.
BIOMEDICAL OPTICS EXPRESS 2020;
11:6108-6121. [PMID:
33282478 PMCID:
PMC7687974 DOI:
10.1364/boe.400720]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/03/2020] [Accepted: 09/13/2020] [Indexed: 06/12/2023]
Abstract
Eccentric photorefraction is an objective technique to determine the refractive errors of the eye. To address the rise in prevalence of visual impairment, especially in rural areas, a minicomputer-based low-cost infrared photorefractor was developed using off-the-shelf hardware components. Clinical validation revealed that the developed infrared photorefractor demonstrated a linear working range between +4.0 D and -6.0 D at 50 cm. Further, measurement of astigmatism from human eye showed absolute error for cylinder of 0.3 D and high correlation for axis assessment. To conclude, feasibility was shown for a low-cost, portable and low-power driven stand-alone device to objectively determine refractive errors, showing potential for screening applications. The developed photorefractor creates a new avenue for telemedicine for ophthalmic measurements.
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