Dr. Crystal Sin Yi Cheung

Ophthalmology – Pediatric Eye Specialist

Boston, MA

Dr. Crystal Cheung is a pediatric ophthalmologist who cares for infants, children, and teens with both common and complex eye conditions. She completed ophthalmology residency at the University of Toronto and a fellowship in Pediatric Ophthalmology at Boston Children's Hospital and Mass Eye & Ear, where she also pursued additional training in pediatric uveitis. Dr. Cheung's clinical interests span strabismus, pediatric cataract and glaucoma, retinopathy of prematurity, corneal and anterior segment disorders in children, and vision issues related to neuro-ophthalmic and genetic conditions. She is a Lecturer in the Department of Ophthalmology & Vision Sciences at the University of Toronto and remains active in research and education. Her work includes peer-reviewed publications on pediatric uveitis management, imaging for sickle cell retinopathy screening, and surgical approaches in complex pediatric eyes. Families appreciate her gentle communication style, collaborative care with multidisciplinary teams, and focus on long-term visual development.

Dr. Ana Luiza Fontes De Azevedo Costa

Ophthalmology – Pediatric Eye Specialist

Peabody, MA

Dr. Costa is an ophthalmologist who specializes in pediatric eye care and strabismus. She welcomes children with common and complex vision concerns, including misaligned eyes and lazy eye, and also treats adults with strabismus. Families appreciate her clear explanations, gentle exam style, and collaborative approach that prioritizes each child’s comfort and long-term visual development. Her training spans Brazil and the United States. She earned her medical degree at University Gama Filho and completed ophthalmology training at Hospital Federal dos Servidores do Estado do Rio de Janeiro. She pursued focused fellowships in ocular motility and strabismus at the University of São Paulo and in pediatric ophthalmology and adult strabismus at UT Southwestern. Fluent in English, Portuguese, and Spanish, Dr. Costa enjoys partnering with multilingual families and coordinating care across programs when surgery or specialized therapies are needed. Whether prescribing glasses and patching or planning precise eye-muscle surgery, her goal is to help patients see clearly and confidently.