Study	Reason for exclusion
Ahluwalia 2001	Wrong intervention
Arici 2006	Wrong intervention
Costa 2012	Wrong intervention
Downie 2018b	Wrong participant population
Gadaria‐Rathod 2013	No relevant outcomes
Hom 2016	Not a RCT
Jackson 2011	Wrong intervention
Kawabata 2011	Wrong participant population
Kaya 2016	Not a RCT
Kwon 2017	Not a RCT
Macrì 2001	Wrong participant population
Macrì 2002	Wrong participant population
Macrì 2003	Wrong participant population
McMonnies 2019	Wrong study design (commentary)
NCT00803452	Wrong intervention
NCT01059019	Wrong patient population
NCT01213342	Study terminated (researchers left institution)
NCT01364311	Study was withdrawn
NCT01630551	Withdrawn with no participants enrolled
No author listed	Wrong study design (letter to editor)
No authors listed	Wrong study design (letter to editor)
Ong 2013	Wrong participant population
Pinna 2007	Wrong participant population (not explicitly defined as 'dry eye')
Querques 2007	Wrong participant population
Scuderi 2012	Wrong intervention
Sharma 2006	Wrong intervention
Tellez‐Vazquez 2016	Not a RCT
Wang 2016	Wrong participant population
Yoon 2012	Wrong intervention