Visit the VisionSource.com homepage, and place the cursor over Patients. Click on Free Eye Chart Download. Click on the eye chart image to open it as a PDF, or the Click Here link to open it as a JPEG.
Print the chart on 8 1/2-inch by 11-inch paper; make sure the size is correct to avoid inaccurate measurements. Set the chart up at your eye level in a room with ample lighting, on a wall without windows. Stand 10 feet from the chart, cover one eye and read the lowest line possible. The lowest line where you could identify a majority of the letters correctly is your visual acuity for that eye. Repeat the process to check the vision for your other eye.
Each line on the chart corresponds to a visual acuity. Visual acuity is measured according to what a person with standard vision can see from 20 feet away. For example, 20/40 vision means that the person sees things 20 feet away as well as someone with standard vision sees things 40 feet away. If a person's corrected vision is less than 20/200, he is considered to be legally blind in the United States. Although 20/20 is standard vision, it isn't perfect; it's possible for people to have a better visual acuity.Learn more about Vision