Footnotes

• Contributors VKG conceived and designed the study. SPR, SB, DKB and RS helped with data acquisition, entry and drafting the article. CSG, HLR, SS, VPR and AKM helped with data acquisition, interpretation and revised the article by providing important intellectual inputs. All the authors approved the final version of the manuscript.

• Funding This research was supported in part by Hyderabad Eye Research Foundation.

• Competing interests None.

• Patient consent Obtained.

• Ethics approval Ethics approval was provided by the L V Prasad Eye Institute Ethics committee, L V Prasad Eye Institute, Hyderabad, India.

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

• Proprietary interest statement The authors have no personal financial interest in the development, production, or sale of any device discussed herein.