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them. It means increased business oppor-tunities with results that are convenient and easy. FIGURE 3 FIGURE 4 Horizontal Prism Imbalance (-3.00D) INTRODUCING OAKLEY TRUE DIGITAL Oakley True Digital considers the patient’s prescription, lens material, lens base curve required, frame shape, tilt and wrap angle to optimize the lens’ prescription to expand the clear view in all directions. Using free-form techniques, prescriptions are uniquely digitized and cut for high wrap frames. For the athlete and sports enthusiast who demands the best vision, it provides continuously clear vision from lens center through mid and far periphery, both nasally and temporally. Corrected Rx at lens center for excellent binocularity and the sharp vision. Eye rotation, measured in degrees THE PRESCRIPTION AT LENS CENTER In wrap frames, flatter, ordinary lenses cre-ate double vision and blur, typically distort the frame and can make the eyewear unwearable. Instead, Oakley True Digital starts with the correct base curve for frame curvature. Since the actual prescription, when tilted and wrapped at extreme angles adds prism and changes lens power, the lens power is reconstructed to deliver the correct prescription in the way that the lens will be worn. This is in fact, the only way to actually deliver the prescription as the doctor pre-scribed it—anything else changes the effec-tive power and binocularity of the eyewear. Wrapping lenses creates prism (typically Base Out) in both plano lenses and in pre-scriptions. The loss of comfortable binocu-larity is the primary reason that patients might have rejected the wrap prescriptions that you’ve tried. Adding the correct com-pensating and opposite prism to the Rx neutralizes any induced prism from a high wrap angle, thus eliminating double vision. The wrap angle also changes the lens’ effective power so the prescription deliv-ered is altered to become the e Rx as pre-scribed in the “as-worn” position. This s delivers the vision exactly as a was pre-scribed by the doctor. In the example (Figure 3), an Rx of -0.25-2.25 x 90 would be measured o on a lensme-ter as -0.16-2.17 x 89, 0.24 BI. I But when it’s at a 25 degree wrap angle, ( (the angle of the lens in the frame used), it w would deliver the Rx that was actually prescribed, with-c out prism. For the wearer, no change to the actual prescription is taking place and dis-pensers can rest assured that there is no “change to the prescription.” For example, a skier must have excellent binocularity and depth perception to judge distance and predict the terrain through a series of moguls. Without a prism corrected Rx, that would not be possible. The results are great looks and excellent acuity, binoc-ularity and comfort. The increased angles of view and the shape of wrap lenses require a peripheral lens design that is also different from stan-dard lenses. There are peripheral base curve, eye angle of view and centration effects, so a digitized redesign of the periph-ery makes sense, especially for the athlete with high performance requirements. NEW, OAKLEY DUAL-PERIPHERAL TECHNOLOGY Oakley Dual Peripheral Technology is designed to ensure improved peripheral image and motion detection. Using free-form techniques, the Oakley laboratory balances the mid-peripheral prismatic effects for binocularity and reduces the blur in the far periphery to best detect movement. MID-PERIPHERY Peripheral powers and prism change as the eye rotates behind the lens. Optimizing the binocular effects i.e., off axis prism imbalance for the frame chosen ensures a balanced view. Figure 4 illustrates the binocular, unwanted horizontal prism in a -3.00D prescription OU. This shows that unwant-April 2012 20/20 • 109
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