title: Variation of online Amsler charts from Google, YouTube and mobile phone Apps.
authors.affiliation: Chelsea and Westminster Hospital NHS Foundation Trust, London, UK.
authors.forename: Sheila
authors.initials: S
authors.lastname: Luk
authors.affiliation: Imperial College London, London, UK.
authors.forename: Kangni
authors.initials: K
authors.lastname: Chen
authors.affiliation: Chelsea and Westminster Hospital NHS Foundation Trust, London, UK.
authors.forename: Nigel
authors.initials: N
authors.lastname: Davies
mesh_terms: D054626:Consumer Health Information / Q000592:standards*; D006801:Humans; D020407:Internet / Q000592:standards*; D063731:Mobile Applications / Q000592:standards*; D009862:Online Systems / Q000592:standards*; D015203:Reproducibility of Results; D014741:Video Recording / Q000592:standards*; D014787:Vision Tests / Q000295:instrumentation*