Standardization allows reducing the possible bias due to external sources of variation between centers. Using the same test in the same conditions around the world ensures less variation in the global reported clinical results. Background luminance can be a source of bias. We review why using an iPad...

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 Auto-Lock...