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  • Contrast sensitivity testing

    Courtesy of Zoë R. Williams, MD. Photography by Brittany Figenscher, CRA.
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    Neuro-Ophthalmology/Orbit
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    A, Pelli-Robson contrast sensitivity chart. B, Early Treatment Diabetic Retinopathy Study (ETDRS) high-contrast chart. C, ETDRS low (2.5%)–contrast chart.