I recently read the manuscript ‘Undermining a common language: Smartphone applications for eye emergencies’, I prepared a Letter to the Editor for clarifying some issues about our Apps for testing vision. Unfortunately, the editor answered that no letters were admitted after one month of publication...

This article describes the process of iPad calibration with Pico Device and PicoDisplay App: 1.- Prepare your iPad The following settings prevent the iPad to automatically switch off during calibration or that change the brightness in an undesirable way: 1.1.- Switch...