title: Reply.
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
authors.forename: Anna V
authors.initials: AV
authors.lastname: Zarubina
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
authors.forename: David C
authors.initials: DC
authors.lastname: Neely
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
authors.forename: Mark E
authors.initials: ME
authors.lastname: Clark
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama; Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama.
authors.forename: Carrie E
authors.initials: CE
authors.lastname: Huisingh
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
authors.forename: Brian C
authors.initials: BC
authors.lastname: Samuels
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama; Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama.
authors.forename: Gerald
authors.initials: G
authors.lastname: McGwin
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
authors.forename: Cynthia
authors.initials: C
authors.lastname: Owsley
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama. Electronic address: curcio@uab.edu.
authors.forename: Christine A
authors.initials: CA
authors.lastname: Curcio