THE MERCK MANUAL: The Merck Manual of Diagnosis and Therapymultimedia

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  • Primary Open-Angle Glaucoma
  • Glaucoma (Normal Eye)

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    Glaucoma (Normal Eye)

    The optic nerve is normally a slightly vertically elongated circle (disk) with a centrally located depression (cup). Optic nerve cells comprise the neuroretinal rim, the tissue between the cup, and disk margins.

    Image courtesy of the University of California at San Diego via the Online Journal of Ophthalmology (