MIT

If given an eye test with the standard Snellen Eye chart (y’know, the one with all the letters on it) you will be asked to stand 20 ft away, cover one eye and read off the letters from the chart as they get increasingly smaller. If you can read up to the lines marked “20” at 20 feet away, you have normal 20/20 vision and your eyes can separate contours that are 1.75 mm apart. Knowing visual acuity is important because it helps diagnose vision problems. But the challenge? Usually people have to go into eye doctors and get an eye test to determine their acuity. However, since more than 40% of…