| SUPERVISOR |
Eduardo Lage, PhD, Universidad Autonoma de Madrid
Pablo Perez-Merino, OD, PhD, Fundacion Jimenez Diaz |
| ABSTRACT |
Objective: To evaluate the performance of a new low-cost handheld autorefractor design,
the “e-see”, in measuring refractive errors of the eye.
Methods: The e-see is a portable and easy-to-use device for measuring refractive
errors of the eye. It is based on a new wavefront sensor concept in which expensive
components are not used. A study with 57 subjects was performed in order to compare
the eyeglasses prescriptions provided by the new device and standard clinical procedures
(objective refraction using autorefractometer + subjective refraction). Visual Acuity (VA)
was measured for prescriptions provided by each method. This study analyzes the
differences in refraction measurements between the QuickSee, a commercial
autorefractometer and subjective refraction (gold standard), as well as the VA obtained
by each method.
Results: The spherical equivalent measured with the device correlates with subjective
refraction in values of r=0.97; with an absolute mean difference between both methods
of 0.32±0.27D (standard deviation). The agreement in sphere measurements between the
device and the subjective refraction was 70% and 88% for 0.25D and 0.5D differences,
respectively. On the other hand, the cylinder agreement was 72% and 95%. There were
no statically differences between the VA obtained by each method.
Conclusions: The new device provides an accurate approximation for refractive
measurements of subjective refraction.
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