| onset = rapid<ref>{{cite book|last1=FNP-C|first1=Maria T. Codina Leik, MSN, APRN, BC|title=Family Nurse Practitioner Certification Intensive Review: Fast Facts and Practice Questions, Second Edition|date=2013|publisher=Springer Publishing Company|isbn=9780826134257|page=112|edition=2|url=https://books.google.ca/books?id=sAwmPqZ4YjIC&pg=PA112|language=en}}</ref>
| duration = less than 3 days<ref name=Fah2015/>
| causes = minor trauma, contact len use<ref name=Fah2015/>
