06/09/2026
Cataracts remain the leading cause of preventable blindness worldwide, yet the surgical gap continues to widen as population growth and aging outpace available care. In recognition of Cataract Awareness Month, Ophthalmology Times spoke with John Berdahl, MD, a board-certified ophthalmologist at Vance Thompson Vision in Sioux Falls, South Dakota, and a professor at the University of South Dakota, who is internationally recognized as a leader in cataract, cornea, glaucoma, and refractive surgery.
A longtime advocate for global eye care access, Berdahl has participated in surgical mission trips worldwide and serves in a leadership capacity with EyeCare America, which connects underserved patients with no-cost ophthalmologic care. In the following Q&A—the first of a 2-part conversation— Berdahl discusses the scale of the global cataract surgical gap, the structural interventions most likely to close it, and what emerging data linking cataract surgery to reduced dementia risk may mean for how surgeons counsel their patients.
In part 1 of a 2-part Q&A, John Berdahl, MD, discusses the widening global cataract surgical gap and examines emerging evidence linking cataract extraction to a reduced risk of dementia.