About Us

Retina Specialists


Retina Specialists are physicians, administrators, and staff dedicated to the highest grade of eye care provided in a friendly, empathic, and professional atmosphere. We take pride in helping our patients to restore their sight, guard their vision, and minimize any loss of vision.

Dedicated to providing the highest quality care in diseases of the macula, retina, and vitreous, our doctors employ the latest knowledge, research, and equipment to treat, monitor, and prevent a variety of disorders. We often provide second and third opinions for many patients seeking the best outcome for their condition. We also provide international consultations for patients around the world.

Our collaboration with colleagues in the tri-state area enhances the quality and management of retinal disorders. For more information about our office and the services we offer, please call us at 212.604.9800 or visit our contact page.

“Founded to enhance the quality of life of our patients by guarding, protecting, and restoring their vision through cutting edge, technologically advanced ophthalmic care delivered in a way that is empathetic and compassionate.”

John Khadem, MD, MPH

John Khadem, MD, MPH is a board certified ophthalmologist, who specializes in diseases and surgery of the retina and vitreous. After completing his bachelor’s degree at Duke University, he received his medical degree from Columbia University, College of Physicians and Surgeons, in New York City. After an internship in surgery, and subsequent residency in ophthalmology at The University of Chicago Hospitals, he received surgical and clinical training in fellowships at Harvard Medical School and the Massachusetts Eye and Ear Infirmary.

Upon completion of his training, he was invited to teach and held both teaching and research appointments at Harvard Medical School. He began his own practice in 2002, where he is continuing to treat patients suffering from a variety of retinal conditions.

Currently an Assistant Clinical Professor of Ophthalmology at New York University, Dr. Khadem is a member of the American Academy of Ophthalmology, Association for Research in Vision and Ophthalmology, and the American Society of Retina Specialists. He has authored numerous peer-reviewed research articles and has been involved in a wide array of research, the most recent of which discusses stem cell implantation for the treatment of macular degeneration. Dr. Khadem holds patents with the University of Chicago and Harvard University on biological tissue adhesives.

Dr. Khadem firmly believes in the healing power of an empathic, caring relationship with his patients. Every member of Retina Specialists is asked to follow this idealogy that their interaction with the patient can help to accelerate healing.

Dr. Khadem is affiliated with New York University, New York Eye and Ear, North Shore University, Long Island Jewish, and Bellevue Hospitals in New York.

Cristiana Pieroni, MD

Pieroni, MD is a board-certified ophthalmologist specializing in disease and surgery of the retina and vitreous. After graduating cum laude from Tufts University, she received her medical degree from the UMDNJ/Robert Wood Johnson Medical. She completed her ophthalmology residency at Tufts University/New England Eye Center. She received her subspecialty training in vitreoretinal surgery from Cornell University/New York Presbyterian Hospital.

A member of theAmerican Academy of Ophthalmologyand theAmerican Society of Retina Specialists, Dr. Pieroni has co-authored several research articles. In addition to treating patients at Retina Specialist PC, Dr. Pieroni is an active researcher in the field of ophthalmology and diseases of the retina.

Her surgical interests include retinal detachment repair, epiretinal membrane peeling, macular hole repair, and retained lens fragment removal. She also specializes in the surgical and medical treatment ofdiabetic retinopathyandmacular degeneration.

Susan Gelman, MD, MPH

Gelman, MD, MPH specializes in the latest diagnostic and therapeutic techniques in treating medical diseases of the retina, including age-related macular degeneration, diabetic retinopathy,retinal vein occlusions, and hereditary retinal dystrophies.

Dr. Gelman received her B.S. degree from Monmouth University, NJ, her medical degree from Columbia University College of Physicians and Surgeons as well as a Master’s Degree in Public Health from Columbia University’s Mailman School of Public Health. During her time at Columbia she published several peer-reviewed manuscripts on retinopathy of prematurity.

After an internship in internal medicine, Dr. Gelman completed her ophthalmology residency training at New York University/Manhattan Eye Ear and Throat Hospital, and then completed her fellowship in medical retina and ophthalmic genetics at the Jules Stein Eye Institute of the University of California, Los Angeles.   She participated in retina-related research, in particular, the characteristics of age-related macular degeneration.

Dr. Gelman is affiliated withNew York Universityand Bellevue Hospitals in New York, and is a member of theAmerican Academy of Ophthalmology.

Practice Acknowledgements

Our Office