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L. N. Thibos, X. Wei; Designing Contact Lenses for a Wide Field of View via Ocular Wavefront Tomography. Invest. Ophthalmol. Vis. Sci. 2009;50(13):5641.
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Correcting the peripheral field is potentially important for vision, for influencing refractive development, and for diagnostic imaging of the retina. We used a new technique called ocular wavefront tomography (OWT) (Wei and Thibos, Opt. Express 2008) to optimize the design of aspheric contact lenses to correct the eye’s optical refractive errors over a wide field of view.
OWT is a technique for customizing a multi-surface model eye to mimic the expected off-axis wavefront aberrations for an individual eye. This technique was adapted for contact lens design by establishing clear design goals for the eye + contact lens system. To demonstrate the method we optimized the shape of an aspheric contact lens to correct a wide angle model eye (Escudero-Sanz et al, JOSA-A (1999)) with three possible levels of foveal myopia (-2D, -4D, and -6D). Two strategies for correction reflected alternative design goals: (1) to fully correct central vision while also improving optical quality peripherally to enhance vision and retinal imaging, or (2) fully correct central vision while introducing a degree of peripheral myopia relative to central vision in order to slow myopia progression.
The OWT technique successfully produced different contact lens designs to achieve different refractive states for the eye over a wide field of view. In addition to correcting foveal vision, the optimized contact lens designs either (1) improved the retinal image quality across the whole visual field significantly to obtain a visual performance benefit or (2) produced the desired level of myopia in the peripheral field to obtain a refractive development benefit.
OWT is capable of optimizing the design of contact lenses to achieve a desired level of peripheral refractive error and optical quality over a wide field of view.
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