Dr. Ashley Brissette

Dr. Sumayya Ahmad is a cornea, external disease, and refractive surgery specialist at Mount Sinai. She joined the system in 2016 and cares for adults with conditions such as keratoconus, dry eye, and cataracts, offering medical therapy and advanced surgical options when needed. Patients value her clear communication and the time she takes to explain choices so they can decide on care that fits their vision needs and daily life. Dr. Ahmad earned her MD from the Yale School of Medicine, completed an internal medicine internship at Mount Sinai West/Morningside, and trained in ophthalmology at the Wilmer Eye Institute at Johns Hopkins. She then pursued fellowship training in Cornea and External Diseases at the Bascom Palmer Eye Institute. She is board-certified by the American Board of Ophthalmology, serves as an Associate Professor at the Icahn School of Medicine at Mount Sinai, and speaks English, Punjabi, Urdu, and Spanish. Her clinical research explores trends in myopia, astigmatism, and ocular surface disease.

Dr. Sahas Narain, MD is a cornea, laser cataract, and refractive surgeon who cares for adults seeking clear, comfortable vision. He completed medical school with honors at the University of Louisville and went on to ophthalmology residency at the University of South Florida Morsani Health, where he served as chief resident. Dr. Narain brings a thoughtful, research-informed approach to every visit and enjoys explaining options in plain language so you can make confident decisions. His clinical interests span modern cataract surgery with advanced lens technology, laser vision correction, and the diagnosis and management of corneal and ocular surface disease. He also evaluates astigmatism and dry eye comprehensively, tailoring treatment plans to fit your goals and lifestyle. Patients appreciate his calm manner, clear communication, and genuine interest in improving quality of life through better vision. Outside the clinic, Dr. Narain stays active in research and professional education and enjoys sports, cooking, hiking, and travel.

Dr. Jerry Hsu is a cornea and cataract specialist at ColumbiaDoctors and the Edward S. Harkness Eye Institute. He combines meticulous diagnostics with advanced surgical options to help patients see more comfortably and clearly. From first visits to post-op care, he explains imaging, risks, and recovery in straightforward terms so people can make informed choices about treatment. Dr. Hsu completed ophthalmology residency at the New York Eye and Ear Infirmary of Mount Sinai and fellowship training at the Bascom Palmer Eye Institute, University of Miami. His clinical interests include cataract surgery, corneal transplantation, corneal cross-linking, and laser vision correction. He also treats pterygium and a broad range of corneal disorders in collaboration with optometry and other specialists. He welcomes patients seeking second opinions or a careful plan for complex corneal disease.