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Cornea and External Diseases

The Cornea Section is comprised of ophthalmologists who specialize in the evaluation and management of various conditions including:

  • Refractive errors (nearsightedness, farsightedness, and astigmatism)
  • Dry eyes and tear disorders
  • Cataracts
  • Blepharitis
  • Conjunctivitis (infectious and allergic)
  • Ectasias (i.e. keratoconus)
  • Dystrophies (i.e. Fuchs’)
  • Ulcers
  • Benign and malignant tumors
  • Traumatic scars
  • Chemical burns

We have state-of-the-art diagnostic modalities such as:

  • Orbscan
  • Corneal Topography
  • Optical Coherence Tomography (OCT)
  • Specular Microscopy
  • Ultrasonic Biometric Analysis

We offer the latest and advanced surgical procedures for patients with common and complex conditions such as:

  • No stitch cataract surgery
  • Presbyopia-correcting intraocular lens implants (ReSTOR, ReZoom, Crystalens)
  • Astigmatism-correcting limbal relaxing incisions
  • Astigmatism-correcting toric intraocular lens implants
  • Corneal transplantation
  • Combined cataract surgery and corneal transplantation
  • Partial corneal transplantation (lamellar)
  • Endothelial transplantation (DSEK)
  • Limbal stem cell transplantation
  • Phototherapeutic keratectomy
  • Superficial keratectomy
  • Conjunctival autografting
  • Amniotic membrane grafting
  • Artificial cornea (keratoprosthesis)
  • Punctal occlusion/cauterization


  • Assistant Professor of Ophthalmology and Visual Science; Residency Director; Vice Chair of Education, Ophthalmology & Visual Science

    Dr. Chow earned her BS at Stanford, and MD at Duke School of Medicine, where she earned an Anlyan Senior Scholarship, received a Howard Hughes research fellowship, and was elected to AOA. Following internship at Kaiser in California, Dr. Chow completed her Ophthalmology Residency at Duke, and was recognized with the Edward K. Isbey, Jr., Resident Award for excellence in clinical care, ethics, and research. She then served a postgraduate year as Chief Resident. She completed her cornea fellowship at the Bascom Palmer Eye Institute in Miami before joining the faculty at Yale. She is the Director of the Cornea and External Disease service at Yale. Dr. Chow’s clinical interests include corneal transplantation (full-thickness penetrating keratoplasty, deep anterior lamellar keratoplasty (DALK), and endothelial keratoplasty (DSAEK and DMEK). She treats a variety of corneal conditions including dry eye, ocular surface disease, graft vs host disease, infectious keratitis, and keratoconus. She also performs cataract surgery with the latest technology including femtosecond laser-assisted cataract surgery and intraoperative aberrometry. Her research interests include medical education. Dr. Chow won the departmental full-time faculty teaching award in 2014 and has served as Residency Program Director since 2014.  She is a member of the American Academy of Ophthalmology (AAO), the Association of University Professors in Ophthalmology (AUPO), and the American Society of Cataract and Refractive Surgery (ASCRS).
  • Assistant Professor of Ophthalmology and Visual Science

    Yvonne Wang, MD is an ophthalmologist specializing in cataract and corneal surgery. She received her medical degree from Weill Cornell Medical College, and then completed her residency in Ophthalmology at the Massachusetts Eye and Ear Infirmary. She then went on to complete a fellowship in Cornea, Anterior Segment and Refractive Surgery at the Cullen Eye Institute at Baylor College of Medicine. Dr. Wang has published several papers and book chapters on ocular surface diseases, infectious keratitis and corneal transplantation. Her research has been presented at multiple national ophthalmology conferences such as Cornea Society and ARVO. She is a member of the American Academy of Ophthalmology and the American Society of Cataract and Refractive Surgery.