A 9-year-old boy visited an ophthalmology clinic in Larissa, Greece, complaining of vision problems in his left eye, the case study published in the New England Journal of Medicine says. Despite having 20/20 vision in his right eye, doctors found that his left eyesight was around 20/100 — a discrepancy explained by a hole on his left macula, a part of the retina that “provides sharp, central vision,” according to the National Eye Institute.
Macular holes can cause blurry and distorted vision, and typically happen through eye trauma or as part of the natural aging process.