title: Author's reply to Elliott, Parkins, Shah and colleagues, and Dhua.
authors.affiliation: Newcastle Eye Centre, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne NE1 4LP and Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, UK.
authors.forename: Michael
authors.initials: M
authors.lastname: Clarke
mesh_terms: D006801:Humans; D013222:State Medicine / Q000458:organization & administration*; D014787:Vision Tests / Q000379:methods*