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Meredith E. Jansen, Pete S. Kollbaum, Brandon H. Koh; Optical And Visual Impact Of Rotationally Stabilized Soft Contact Lens Positioning Errors In Real-time. Invest. Ophthalmol. Vis. Sci. 2012;53(14):4727.
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Quality of vision through a contact lens is affected by on-eye nominal decentrations and dynamic positional changes of the lens. The purpose of the current study was to quantify the positional and corresponding real-time optical changes of rotationally stabilized soft contact lenses during normal wear periods.
Simultaneous high-speed (16hz) videography and whole-eye aberrometry (5mm) were collected over a 10 second wear period including blinking, on 20 dilated eyes wearing 3 different thin-zoned (TZ) and 3 different prism-ballasted (PB) commercially available rotationally stabilized contact lens designs. All lenses were worn in -3, -6, and +4 D powers and contained -0.75Dx180 of cylinder. Each eye wore a total of 18 lenses. A lens-only aberrometer was used to measure the off-eye lens optics. Data from left eyes was converted to right eye equivalent. To describe changes in image quality during typical wear image quality metrics were used.
TZ designs had an ave±std nominal decentration from pupil center of 0.48±0.19 temporally and 0.35±0.52mm inferiorly, while PB lenses decentered 0.67±0.18 temporally but 0.26±0.33mm superiorly. Maximal change in decentration during the wear period for both lens types was quite similar. TZ lenses were nominally rotated 0.61±6.06 degrees temporally, and varied 3.48±3.53 degrees from this position, while PB lenses were nominally rotated 18.24±18.21 degrees temporally and varied 6.82±3.52 degrees from this position. Visible changes in higher-order wavefront reconstructions and image quality simulations are induced by these static and dynamic mispositions.
TZ and PB lenses dynamically position differently when on the eye, causing differences in attainable image quality for their wearers.
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