At work, Fred has been put on reduced duties due to a problem with his eyes, whereby the light does not form a point*.
Without googling/looking in a dictionary, which is these is correct?
YABU - Fred has astigmatism.
YANBU - Fred has a stigmatism.
FWIW I know what it is due to having it myself, but there was debate at work as to which is correct. I am curious as to what the wider public’s knowledge is like.
*approximately, IANAO