Validation of an Affordable Handheld Wavefront Autorefractor
| Autor: | Enrique Seco, Nicholas J. Durr, Shivang R. Dave, Ignacio Casares, Daryl Lim, Marcos Rubio, Eduardo Lage, Pablo Pérez-Merino, Carlos S. Hernández |
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| Rok vydání: | 2019 |
| Předmět: |
Adult
Male Visual acuity genetic structures Visual Acuity Spherical equivalent Eye care Refraction Ocular 03 medical and health sciences Young Adult 0302 clinical medicine Outcome Assessment Health Care medicine Humans Mathematics Aged Wavefront Aberrometry Reproducibility of Results Cycloplegia Presbyopia Middle Aged Refractive Errors Subjective refraction Refraction Ophthalmology Autorefractor 030221 ophthalmology & optometry Optometry Female medicine.symptom 030217 neurology & neurosurgery |
| Zdroj: | Optometry and vision science : official publication of the American Academy of Optometry. 96(10) |
| ISSN: | 1538-9235 |
| Popis: | Significance There is a critical need for tools that increase the accessibility of eye care to address the most common cause of vision impairment: uncorrected refractive errors. This work assesses the performance of an affordable autorefractor, which could help reduce the burden of this health care problem in low-resource communities. Purpose The purpose of this study was to validate the commercial version of a portable wavefront autorefractor for measuring refractive errors. Methods Refraction was performed without cycloplegia using (1) a standard clinical procedure consisting of an objective measurement with a desktop autorefractor followed by subjective refraction (SR) and (2) with the handheld autorefractor. Agreement between both methods was evaluated using Bland-Altman analysis and by comparing the visual acuity (VA) with trial frames set to the resulting measurements. Results The study was conducted on 54 patients (33.9 ± 14.1 years of age) with a spherical equivalent (M) refraction determined by SR ranging from -7.25 to 4.25 D (mean ± SD, -0.93 ± 1.95 D). Mean differences between the portable autorefractor and SR were 0.09 ± 0.39, -0.06 ± 0.13, and 0.02 ± 0.12 D for M, J0, and J45, respectively. The device agreed within 0.5 D of SR in 87% of the eyes for spherical equivalent power. The average VAs achieved from trial lenses set to the wavefront autorefractor and SR results were 0.02 ± 0.015 and 0.015 ± 0.042 logMAR units, respectively. Visual acuity resulting from correction based on the device was the same as or better than that achieved by SR in 87% of the eyes. Conclusions This study found excellent agreement between the measurements obtained with the portable autorefractor and the prescriptions based on SR and only small differences between the VA achieved by either method. |
| Databáze: | OpenAIRE |
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