Mild COVID-19 can cause severe and long-lasting eye problems, according to a study from Linköping University, Sweden. The study also explains why it has been difficult for sufferers to get help: the abnormal eye behaviour cannot be detected by standard methods. The researchers have developed a diagnostic model to detect COVID-related eye problems.

“I think it’s very important that the problem is recognised and that we show that it can be measured by objective testing. Patients don’t have access to that today. We’ve studied people in Sweden, but believe that many people around the world are experiencing these problems,” says Neil Lagali, professor of experimental ophthalmology at Linköping University, who led the study published in Nature Communications.

The study originated with people seeking care for eye problems following a mild COVID-19 infection. They were experiencing a lot of discomfort, sensitivity to light and in many cases severe eye pain, difficulty reading and focusing their gaze.