Download an eye chart such as a Snellen or Sloan eye chart from VisionSource.com, or use Dok LLC's mobile app Eye Chart Pro, as of 2015. Vision Source's eye chart comes in a PDF format and is printable once downloaded.
Vision Source's free eye chart is available for anyone to download without the need for a membership. Eye chart users need to stand 10 feet from the chart, which is taped or tacked to the wall. Also, when using the eye chart, the user must cover the other eye.
The Eye Chart Pro app includes numerous charts, such as the HOTV, downloadable to iPhones and iPods. The app also provides customization such as resizing functions and isolating lines.