A new study form China reveals that up to 20% of children infected with the novel coronavirus may suffer from eye problems, the most common being conjunctivitis or pink eye. Children who had other symptoms, such as a cough, were more likely to have ocular complications, according to researchers.

According to Today, similar symptoms appeared in adults, but experts said that the new research can help doctors diagnose COVID-19 in kids.

“The study tells us as ophthalmologists that, if you’re seeing children and they have pink eye or other signs of conjunctivitis that could be a sign of COVID-19,” said Dr. Neil Bressler, editor of JAMA Ophthalmology.

Children and COVID-19 have come into the limelight lately as cases among the young have increased across the country. While symptoms are generally mild, some symptoms in children can have serious health consequences.

Pediatricians have reported that a rare but life-threatening syndrome linked to COVID-19 that’s affecting youngsters. It’s called multisystem inflammatory syndrome in children, or MIS-C, and several children have already died in the U.S.

According to NBC News, Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, warned that we don’t know a lot about how COVID-19 affects children.

“We really have to be very careful,” he said. “because the more and more we learn, we’re seeing what this virus can do.”