Results: For 36 myopic eyes, clinically equivalent (and not statistically different) HC VA was provided with both the objective and subjective refractions (undilated mean ± S.D. was -0.06 ± 0.04 with both refractions; dilated was -0.05 ± 0.04 with the objective, and -0.05 ± 0.05 with the subjective refraction). LC logMAR VA provided by the objective refraction was also clinically equivalent and not statistically different to that provided by the subjective refraction through both natural and dilated pupils for myopic eyes. In free viewing the objective prescription was preferred over the subjective by 72% of myopic eyes when not dilated. For four habitually undercorrected high hyperopic eyes, the VSX-objective refraction was more positive in spherical power and VA poorer than with the subjective refraction.

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Purpose: To prospectively examine whether using the visual image quality metric, visual Strehl (VSX), to optimise objective refraction from wavefront error measurements can provide equivalent or better visual performance than subjective refraction and which refraction is preferred in free viewing.

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Conclusions: A method of simultaneously optimising sphere, cylinder, and axis from wavefront error measurements, using the visual image quality metric VSX, is described. In myopic subjects, visual performance, as measured by HC and LC VA, with this VSX-objective refraction was found equivalent to that provided by subjective refraction, and was typically preferred over subjective refraction. Subjective refraction was preferred by habitually undercorrected hyperopic eyes.

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Keywords: image quality metrics; objective refraction; visual Strehl; visual acuity; wavefront error.

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Methods: Subjective refractions and wavefront aberrations were measured on 40 visually-normal eyes of 20 subjects, through natural and dilated pupils. For each eye a sphere, cylinder, and axis prescription was also objectively determined that optimised visual image quality (VSX) for the measured wavefront error. High contrast (HC) and low contrast (LC) logMAR visual acuity (VA) and short-term monocular distance vision preference were recorded and compared between the VSX-objective and subjective prescriptions both undilated and dilated.

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Frequency histograms of short-term monocular preference comparison between the VSX-optimised-objective prescription and the…

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VISI-ONE USA is a premier designer, manufacturer, and wholesale distributor of bedding, bath, and related home textile products. VISI-ONE owns and operates a fulfillment and manufacturing facility in Orangeburg, South Carolina, USA. VISI-ONE holds bedding licenses for Realtree, Browning, Mossy Oak, Bone Collector, True Grit, and Ducks Unlimited. In-house brands include Karen Maki Home, Blue Ridge Trading, and Pawtex. VISI-ONE bedding products include comforter sets, sheets, window treatments, accent pillows and crib bedding. Bath products include shower curtains, bath mats, and bath resins. The bedding and bath products coordinate with our throws and door mats. VISI-ONE also offers excellent quality dog beds. Consumers may purchase VISI-ONE bedding products at national department stores, specialty stores, catalog companies, and online bedding retailers.

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