Refractive Errors Clinical Trial
Official title:
Direct Comparison of SVOne Obtained Refraction to Subjective Manifest Refraction
The purpose of the study is to compare the final glasses prescription based on refraction obtained with SVOne device to the final prescription obtained via subjective manifest refraction.
Uncorrected refractive error is the leading cause of vision impairment and the second leading
cause of blindness worldwide, affecting 1 in 90 individuals (1). In the US population
approximately 14 million individuals aged 12 years or older have visual impairment (defined
as distance visual acuity of 20/50 or worse), of which more than 11 million individuals (2)
could have their vision improved to 20/40 or better with refractive correction.
Uncorrected refractive error impacts all aspects of life, including, but not limited to, loss
of employment opportunities, inability to care for family, and inability to receive an
education. SVOne is smartphone-based autorefractor, powered by wavefront aberrometry, due to
its portability and accuracy it presents as an effective and accessible method of detecting
refractive error and dispensing spectacles for better vision (3).
In this study, for each patient, a single clinician will determine final prescription through
manifest refraction, while a different clinician will determine final prescription using
SVOne exam protocol. Sphere, cylinder and axis will be converted to power vectors and
compared by linear regression analysis.
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