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Frank Spors, Jason Shen, Dorcas Tsang, Lance McNaughton, Donald Egan; In-Vivo Evaluation of Peripheral Refraction Changes with Single Vision and Multifocal Soft Contact Lenses. Invest. Ophthalmol. Vis. Sci. 2018;59(9):5807.
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© ARVO (1962-2015); The Authors (2016-present)
This study investigated changes of peripheral refraction with various corrective power values when wearing commercially available single vision and multifocal soft contact lenses with different designs.
Using a commercial Shack-Hartmann aberrometer (COAS), wavefront aberrations were measured with and without soft contact lenses in an adult subject’s right eye. Measurements were conducted at the fovea and at 10o, 20o and 30o nasal retinal eccentricity. Three different types of contact lenses were fitted: Acuvue Oasys Single Vision (ASV), Proclear Multifocal D +2.50 D add (PMD), and ArtMost SoftOK (SOK). Each lens type was fitted in corrective power values of -2.00 D, -4.00D and -6.00 D. Relative refractive errors were computed in power vector notation M, J180, and J45 from measured second order Zernike terms.
ASV lenses consistently produced a slight relative myopic defocus up to 20o retinal eccentricity (-0.29 D ± 0.03), without significant differences between the various lens power values. PMD lenses did not create clinically significant myopic defocus (at least -0.25 D), except for the -6.00 D lens which produced -0.46 D at 20o retinal eccentricity. All SOK lenses produced significant relative myopic shifts at 20o (-0.86 D ± 0.08) and 30o (-1.36 D ± 0.15) retinal eccentricity, without significant difference between the various lens power values. For all lens types and power values, off-axis Astigmatism J0 increased peripherally and reached clinical significance beyond 20o retinal eccentricity. Within a particular lens type, the increased amount of J0 did not differ significantly for the various dioptric lens power values. SOK lenses produced significantly higher amounts of J0 at 30o retinal eccentricity compared with ASV and PMD lenses (SOK vs. ASV vs. PMD: -1.67 D ± 0.09, -0.81 D ± 0.07, -0.72 D ± 0.15).
In general, relative peripheral refractions of ASV, PMD, and SOK soft contact lenses were independent of central corrective power values. An exception was the -6.00D PMD lens, which produced a higher myopic defocus at 20 degrees eccentricity. The SOK lenses used in this study demonstrated a stronger capability in producing relative peripheral myopic defocus at the far nasal retinal periphery. More studies are needed to identify optimal soft contact lens designs for producing adequate levels of peripheral myopic defocus for myopia progression control.
This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.
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