Step 1: Stand approximately 6 feet (1.8 meters) away from your computer screen.
Step 2: Covering one eye, note the lowest row that appears clear. If you cannot clearly see the “20/20" row with your glasses/contacts in, your prescription may need to be updated. If you cannot clearly see the “20/30” or "20/40" rows, you may not be able to pass the DMV eye test in your state. To see the minimum vision required by state DMV's, click the "Home" button and scroll down.
Step 3: Repeat steps 1 through 3 while switching eyes.