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Spherical aberration correction using adaptive optics showed vision improvement
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Correcting ocular spherical aberrations using an adaptive optics system improved subjects’ visual acuity and contrast sensitivity without sacrificing their tolerance for defocus, a study found.
Patricia A. Piers and colleagues in the Netherlands and Spain used an adaptive optics vision simulator to evaluate the potential advantages and disadvantages of IOLs with modified spherical aberration profiles. The subjective visual performance of four participants was assessed via letter acuity and contrast sensitivity at 3, 6 and 15 cycles/degree for two values of induced spherical aberration.
With correction of spherical aberration, there was an improvement in visual acuity of 10% in white light and 38% in green light. Contrast sensitivity was similarly improved. With spherical aberration corrected, even when a defocus as large as ±1 D was introduced, visual performance was as good as or better than for normal spherical aberration, the researchers found.
The study is published in the December issue of Investigative Ophthalmology & Visual Science.