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    AAO 2019 Video Program
    Cataract/Anterior Segment

    Negative dysphotopsia (ND) is an unwarranted phenomenon that about 15% of patients complain of after perfect cataract surgery, and in 3% it persists for months. The video discusses two widely accepted theories about its etiology and describes an innovative new device made of hydrophilic acrylic, called the ND Ring, which addresses both the theories of causation of ND. A prototype of the ND Ring was implanted in 10 eyes of eight patients. Eight eyes were implanted therapeutically for ND persisting for more than 3 months, and out of these eight patients, two opted for prophylactic implantation in the second eye. ND resolved in all eyes after therapeutic implantation and did not occur in any eye after prophylactic implantation. The video demonstrates the surgical technique and also the resolution of ND as described by them.