Ocular neurosis

 Ocular neurosis is the usual cause of eye strain headache that begins abruptly with use of the eyes in which there is a normal ophthalmologic exam.[1]

ICD classification: F45.8 Neurosis ocular [2]

This article uses material from the Wikipedia article
 Metasyntactic variable, which is released under the 
Creative Commons
Attribution-ShareAlike 3.0 Unported License
.