title: Reply.
authors.affiliation: Brien Holden Vision Institute, Sydney, NSW, Australia; School of Optometry and Vision Science, University of New South Wales; African Vision Research Institute, University of KwaZulu-Natal. Electronic address: k.naidoo@brienholdenvision.org.
authors.forename: Kovin S
authors.initials: KS
authors.lastname: Naidoo
authors.affiliation: Brien Holden Vision Institute, Sydney, NSW, Australia.
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Fricke
authors.affiliation: Brien Holden Vision Institute, Sydney, NSW, Australia; School of Optometry and Vision Science, University of New South Wales; African Vision Research Institute, University of KwaZulu-Natal.
authors.forename: David A
authors.initials: DA
authors.lastname: Wilson
authors.affiliation: Brien Holden Vision Institute, Sydney, NSW, Australia.
authors.forename: Monica
authors.initials: M
authors.lastname: Jong
authors.affiliation: Brien Holden Vision Institute, Sydney, NSW, Australia; School of Optometry and Vision Science, University of New South Wales.
authors.forename: Padmaja
authors.initials: P
authors.lastname: Sankaridurg
authors.affiliation: Singapore Eye Research Institute, Singapore National Eye Center, Duke-NUS Medical School, Singapore.
authors.forename: Tien Y
authors.initials: TY
authors.lastname: Wong
authors.affiliation: Brien Holden Vision Institute, Sydney, NSW, Australia.
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Naduvilath
authors.affiliation: Brien Holden Vision Institute, Sydney, NSW, Australia; School of Optometry and Vision Science, University of New South Wales.
authors.forename: Serge
authors.initials: S
authors.lastname: Resnikoff