Dr. Mark Mcgannon

Derek Barker is an Ophthalmologist practicing medicine in Columbia, South Carolina. Dr. Barker is highly rated in 37 conditions, according to our data. His clinical expertise encompasses Diabetic Retinopathy, Age-Related Macular Degeneration (ARMD), Late-Onset Retinal Degeneration, and Geographic Atrophy. Dr. Barker is board certified in American Board Of Ophthalmology. Dr. Barker is currently accepting new patients.

Dennis Marcus is an Ophthalmologist practicing medicine in Aiken, South Carolina. Dr. Marcus is highly rated in 10 conditions, according to our data. His clinical expertise encompasses Diabetic Macular Edema (DME), Age-Related Macular Degeneration (ARMD), Diabetic Retinopathy, Late-Onset Retinal Degeneration, and Vitrectomy.

Born in China, Dr. Tang immigrated with his family to Los Angeles, CA, at a young age and grew up in suburban Philadelphia, PA. He attended the University of Pennsylvania, where he majored in Neuroscience. Dr. Tang's passion for Ophthalmology was sparked during college when he worked in a vision research laboratory. Afterward, he attended MUSC in Charleston and obtained M.D. and Ph.D. degrees. Dr. Tang received numerous grants from the National Institutes of Health and the Research to Prevent Blindness Foundation for his dissertation research, which evaluated the role of vitamin A metabolism in genetic diseases of the retina.While in medical school, he was honored as a Presidential Scholar, received the Dean's Scholarship, and graduated with a Ph.D. with Distinction. Dr. Tang completed his internship at the Hennepin County Medical Center and Ophthalmology residency at the University of Minnesota in Minneapolis, MN. He received the Resident Research Award, a research fellowship from the VitreoRetinal Surgery Foundation, and consecutive Resident Teaching Awards for each year of his residency. He then returned to California for a Vitreoretinal Diseases and Surgery fellowship at the Byers Eye Institute at Stanford University School of Medicine in Palo Alto.Dr. Tang began his career in private practice at Retina Consultants of Minnesota in 2019 in Minneapolis/St. Paul, where he practiced surgical retina and Ocular Oncology. In late 2023, he transitioned back to academia by joining Storm Eye Institute at MUSC as a faculty practicing surgical retina and ocular oncology. Dr. Tang is fully board-certified by the American Board of Ophthalmology. He is an active member of the American Academy of Ophthalmology and the American Society of Retina Specialists. He is also an editor and reviewer for numerous medical journals and a writer and teacher for the Osler Institute and OphthoQuestions, both of which help Ophthalmologists prepare for board examinations. Dr. Tang is highly rated in 38 conditions, according to our data. His clinical expertise encompasses Retinal Detachment, Endophthalmitis, Late-Onset Retinal Degeneration, Vitrectomy, and Cataract Removal. Dr. Tang is currently accepting new patients.