{"product_id":"traditional-snellen-eye-chart","title":"Traditional Snellen Eye Chart","description":"\u003cp\u003eNon-reflecting, matte finish.\u003c\/p\u003e\n\u003cp\u003eThe Snellen eye chart was originally introduced in 1862 by Herman Snellen. The Snellen eye test uses the idea of a subtended 5 minutes of arc with a 20 foot distance. This became the standard vision measurement. Also, Snellen developed the idea of a 5x5 grid for a standard for his optotypes. Each optotype must meet certain percentage requirements in this grid before it is used for testing. This helps to make a uniform and equal vision chart. The Snellen eye chart is the basis for many other vision tests.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921484341409,"sku":"5002","price":23.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/c501a702ef05e90d163a1eeeb1633357_XL-scaled-1.jpg?v=1776157154","url":"https:\/\/precision-vision.com\/products\/traditional-snellen-eye-chart","provider":"Precision Vision","version":"1.0","type":"link"}