Parkinsonâs Disease (PD) is a chronic, progressive disorder that affects nerve cells deep in the brain responsible for planning and controlling body movement. Dopamine is a chemical used in body movement.
Chart.js is a JavaScript library that allows you to draw different types of charts by using the HTML5 canvas element. Since it uses canvas, you have to include a polyfill to support older browsers. The one suggested by the author is ExplorerCanvas, so you may want to stick with it.
J2 is considered the equivalent of 20/20 distance visual acuity at the reading distance indicated on the card (usually 12 to 14 inches from your eyes). The chart can be used in two different ways, depending on what your eye doctor is trying to measure: 1  The chart is held at a specified reading distance (such as 12 inches) and you are asked to read the passage with the smallest type you can see.