Correction to: BMC Ophthalmology 2019 19:47

https://doi.org/10.1186/s12886-019-1055-8

Following publication of the original article [1], the authors notified us that Fig. 3 was published as a table, when it should actually be a diagram of study countries. In this correction article, Fig. 3 was updated. The original article was corrected.

Fig. 3
figure 1

Distribution of included studies by countries where they were conducted