Scientists discover Pfizer COVID jab linked to major eye damage | 18 July 2025 | Scientists have discovered that Pfizer's COVID-19 vaccine may increase the risk of eye damage, leading to vision loss. The new study specifically examined how the vaccine affected patients' corneas, the clear front part of the eye that allows light to enter. In 64 people, scientists in Turkey measured changes in the cornea's inner layer, called the endothelium, before taking the first Pfizer dose and two months after receiving the second. Results revealed that taking both doses of the vaccine led to thicker corneas, fewer endothelial cells in the eye and more variation in size of these specialized cells that form the endothelium.