Sore eyes are the most significant vision-based indicator of COVID-19, according to new research published in the journal BMJ Open Ophthalmology.
Researchers at Anglia Ruskin University (ARU) asked people who had a confirmed COVID-19 diagnosis to complete a questionnaire about their symptoms, and how those compared to before they tested positive.
The study found that sore eyes was significantly more common when the participants had COVID-19, with 16% reporting the issue as one of their symptoms. Just 5% reported having had the condition beforehand.
While 18% of people reported suffering from photophobia (light sensitivity) as one of their symptoms, this was only a 5% increase from their pre-COVID-19 state.
Of the 83 respondents, 81% reported ocular issues within two weeks of other COVID-19 symptoms. Of those, 80% reported their eye problems lasted less than two weeks.
The most common reported symptoms overall were fatigue (suffered by 90% of respondents), a fever (76%) and a dry cough (66%).
Lead author Professor Shahina Pardhan, Director of the Vision and Eye Research Institute at ARU, said: “This is the first study to investigate the various eye symptoms indicative of conjunctivitis in relation to COVID-19, their time frame in relation to other well-known COVID-19 symptoms and their duration.
“While it is important that ocular symptoms are included in the list of possible COVID-19 symptoms, we argue that sore eyes should replace ‘conjunctivitis’ as it is important to differentiate from symptoms of other types of infections, such as bacterial infections, which manifest as mucous discharge or gritty eyes.
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