Eyecare Information The relationship between orthokeratology (ortho-k) lens wear and microbial keratitis Paco Chan - August 25, 2017 - 3 min read In 2014, some news reports stating that children wearing ortho-k lenses had 5 times more risk of getting microbial keratitis. In this blog entry, I would like to discuss whether it is totally true or not.