Footnotes

• Contributors HSD, AMO, DGS and LAF, all contributed to the study design, acquisition of data, literature search and drafting the manuscript. HSD also contributed in the conception and clinical interpretation of ocular surface findings, critically revising the article and approving the final version to be published.

• Funding This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests None.

• Provenance and peer review Not commissioned; externally peer reviewed.

• Data sharing statement Further queries regarding data sharing and any additional data to be directed to the corresponding author HSD.