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Robert H Graham, MD Consultant, Department of Ophthalmology, Mayo Clinic, Scottsdale, Arizona

Robert H Graham, MD is a member of the following medical societies: American Academy of Ophthalmology, American Medical Association, Arizona Ophthalmological Society

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

R Christopher Walton, MD Adjunct Professor, Department of Ophthalmology, University of Texas Health Science Center at San Antonio

R Christopher Walton, MD is a member of the following medical societies: American Academy of Ophthalmology, American Uveitis Society

Disclosure: Nothing to disclose.

Hampton Roy, Sr, MD † Associate Clinical Professor, Department of Ophthalmology, University of Arkansas for Medical Sciences

Hampton Roy, Sr, MD is a member of the following medical societies: American Academy of Ophthalmology, American College of Surgeons, Pan-American Association of Ophthalmology

Disclosure: Nothing to disclose.

Andrew W Lawton, MD Neuro-Ophthalmology, Ochsner Health Services

Andrew W Lawton, MD is a member of the following medical societies: American Academy of Ophthalmology, Arkansas Medical Society, Southern Medical Association

Disclosure: Nothing to disclose.

The authors and editors of Medscape Reference gratefully acknowledge the contributions of previous coauthors, David T Wong, MD, FRCS(C), and Hesham Lakosha, MBChB, MS, FRCS, to the development and writing of this article.

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