At least once in your life, you must have squinted at the eye chart at the doctor’s office or DMV, trying to make out the blurry bottom line. The test seems simple enough, right? Read a random string of consonants and vowels on one line, then repeat the process with the line below until you can’t make out the letters anymore.
One of Snellen’s big accomplishments was standardizing the eye chart so that others could use the same principles to develop their own tests. So we decided to give it a try. In the video above, we trace the eye chart back to its origins and take a close look at the biology of visual acuity and the math that goes into testing its limits. Then, we go to ridiculous lengths to test my own eyesight. Spoiler alert: it’s awesome.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.