VISIO 22+ Control PanelVISIO 22+ Control Panel Buttons - Quick ReferencePowerShort press of about 1 second will power up the device (lightson).Long press will switch off.Auto FocusToggles Auto Focus on and off.Auto Focus on has always a sharp image.Auto Focus off is for taking handwritten notes.Image optimizerSelects one of five image quality optimizer settings forviewing critical documents with low contrast or bad print.ZoomTurn knob left to decrease magnification, turn knob right toincrease magnification.PictureUse this option to view pictures or documents in true colours.Also good for viewing bad print and for writing.Text – ReverseUse text mode for reading. Contrast is enhanced so reading ismore easy. Press again to toggle foreground and backgroundcolors.False colorsIn Text mode: Press to change between 7 false colours. (UseText button to reverse foreground and background)In Picture mode: toggle white balance between warm reddishwhite, neutral white and cold blueish white..7