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    New tool to evaluate dark adaptation

    Orlando—Almost 70% of patients with age-related macular degeneration (AMD) are unaware of their disease until vision loss has occurred, said Gregory R. Jackson, PhD.

    “Obviously, we are not adequately detecting early AMD with current methods,” said Dr. Jackson, Penn State College of Medicine, Hershey, PA.

    Dark adaptation impairment is a prominent visual function deficit in AMD, even among those with normal visual acuity, and is a potentially potent method for early AMD detection, he said.

    Dark adaptation evaluates the transition from day to night vision, but traditional tests that measure it are time consuming regardless of disease severity, Dr. Jackson said.

    In some cases, it can take the patient up to 90 minutes for complete recovery after dark adaptation evaluations, he added. One device (AdaptDx, MacuLogix) provides an objective estimate and interpretation of dark adaptation, with low patient burden, Dr. Jackson said.

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