“In 2015, The BMJ (formerly British Medical Journal) did a thorough audit of online symptom checkers. It found that, on average, the sites listed the correct diagnosis first only about a third of the time. Carl Shen, an ophthalmology resident at McMaster University, has led a team of researchers in a small-scale follow-up looking specifically at eye health and got equally concerning results: the correct diagnoses popped up first only a quarter of the time.
The results, presented at the Annual Meeting of the American Academy of Ophthalmology this week, are early and provisional, but Dr. Shen and his team are planning a larger follow-up study. In the meantime, WebMD has done an update of its algorithm.”