In addition, your computer should have a smartphone and a number card. Even a little card or piece of paper, which can be covered one eye. The test will be with both eyes alternately. Then open the website and click on the blue button Try now. A chart on the next page will open the letters will be available in various sizes. There will be a QR code that the top of your phone to scan test could be on the phone.
Now come on screen four meters are being read and written the first letter. If you see the same computer screen on the phone lines and characters will be present but will become stars in their place over the phone. If you can read this letter from the options displayed on the phone's location by clicking on the star to type the correct letter.
It shall forward such test and providing end result will be that you made is correct or not.