Table 1: Electronic databases used and search strategy.

Database	Search Strategy Keywords/MeSH
Pubmed http://www.ncbi.nlm.nih.gov/pubmed/	Dental occlusion OR Temporomandibular joint(s) OR Tmj OR Lower Jaw OR Mandible AND Ophthalmology OR Vision OR
Google Scholar scholar.google.it	Pupil(s) OR Strabism OR
Scopus www.scopus.com/home.url	Myopia OR Astigmatism OR Hypermetropia