About Our Waltham Practice

Welcome to the Massachusetts Eye Research and Surgery Institution (MERSI).

Everything that we have planned for and that we do at MERSI revolves around one theme: Patient-Centered Care, where you will receive the very best medical care, delivered in an especially warm manner by our physicians, technicians and support staff. We will welcome you to a comfortable reception room where you will find refreshments, wireless Internet, reading material, and a patient courtesy phone. At MERSI, we are always striving for success in making your appointment with us as pleasant and efficient as possible.

As a further convenience, MERSI offers a complete eye care center for all your diagnostic and therapeutic needs.  A full menu of diagnostic testing services is available at MERSI.  All testing results are interpreted in a timely manner on the same day as your appointment.  In addition, all diagnostic and clinical data are compiled into your electronic medical record and your referring doctor will receive a comprehensive report of your consultation by fax or mail, if preferred.

Our Physicians

All of our physicians have completed Fellowships in their specialty.

C. Stephen Foster, MD, FACS, FACR


Stephen D. Anesi, MD, FACS

Partner and Co-President

Peter Y. Chang, MD, FACS 

Partner and Co-President

Peter L. Lou, MD


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