A build-up of immune cells and nerve damage in the eye can indicate COVID Long Haulers, a study may show. This preliminary study still needs verification from people who have other symptoms that could be attributed to COVID Long Hauler.
One technique that researchers use to diagnose COVID Long Haulers is corneal confocal microscopy, which views the nerves in the eyes. The powerful images allow experts to see signs of nerve damage in other areas of the body.