Dr. Brandon Riemer

Dr. David Portney is a comprehensive ophthalmologist at Grosinger, Spigelman & Grey who specializes in cataract and refractive surgery along with the medical management of diabetic eye disease and glaucoma. Trained from undergraduate through medical school, internship, and residency at the University of Michigan—including ophthalmology residency at the Kellogg Eye Center—he brings a consistent standard of excellence and a thoughtful, patient-first approach. In the clinic and surgery center, Dr. Portney focuses on clear communication and shared decision-making. He offers modern cataract surgery with advanced lens options, evaluates candidacy for laser vision correction, and guides patients with chronic conditions such as diabetes and glaucoma using current, evidence-based care. Patients appreciate his attentive manner, practical explanations, and commitment to seamless experiences before, during, and after treatment. His goal is to ensure every visit ends with clarity and confidence about the next steps.

Dr. Matthew Pieters is a board-certified ophthalmologist at Fraser Eye Care Center who specializes in anterior segment and cataract surgery. He provides patient-centered, evidence-based care, helping people understand their options and choose personalized treatment plans that fit their visual goals and lifestyle. In addition to surgical care, he offers comprehensive ophthalmology services and partners closely with the care team to ensure a smooth experience before and after surgery. Dr. Pieters graduated summa cum laude from Washington University in St. Louis and earned his medical degree at Emory University School of Medicine. He completed an ophthalmology residency at the renowned Wills Eye Hospital and an internship at St. Francis Hospital. Originally from the Chicago suburbs, he is proud to serve patients across metro Detroit with clear communication, attention to detail, and a calm, supportive bedside manner.

Dr. Sean Hansen is a board-certified ophthalmologist who provides comprehensive eye care, including medical and surgical treatment for common eye diseases. He performs cataract surgery and offers advanced lens options, including premium intraocular lens implants and laser-assisted cataract surgery, to help patients meet their vision goals. After earning his medical degree from the Medical College of Wisconsin, Dr. Hansen completed internship training at St. Joseph Mercy Hospital in Ann Arbor and ophthalmology residency at the University of Michigan’s Kellogg Eye Center. He cares for patients with cataracts, glaucoma, macular degeneration, and diabetic eye disease, and he performs minimally invasive glaucoma surgery with the iStent when appropriate. Dr. Hansen focuses on listening closely, explaining choices clearly, and helping patients feel confident about their care.