{"product_id":"logmar-4m-etdrs-chart-2-revised","title":"Logmar 4m ETDRS Chart 2 Revised","description":"\u003cdiv class=\"ewa-rteLine\"\u003eLogmar 4m ETDRS Chart 2 Revised\n\n4 metre viewing.\n Acuity range 40m to 2M.\n\nWill fit illuminated cabinets \u003ca href=\"%%+logmar-chart-slim-cabinet-sussex-p-5539.html%%-\"\u003eSDT-392-LSV\u003c\/a\u003e and \u003ca href=\"%%+precision-vision-logmar-cabinet-p-5544.html%%-\"\u003eSDT-396-LPV\u003c\/a\u003e\n\nThese revised charts incorporate a slight change in the difficulty score for each of the ten Sloan letters derived from the best visual acuity examinations of 7420 eyes during the ETDRS study. The original charts difficulty scores were derived from the examination of 234 eyes. In addition to the revised arrangement of letters which resulted in the ultimate homogeneity of difficulty per line, the three charts are balanced so that in each\u003cbr\u003e\nchart the ten letters are represented\u003cspan lang=\"en-gb\"\u003e \u003c\/span\u003eat least once in every position.\u003cbr\u003e\n\u003cbr\u003e\n\n\n\u003c\/div\u003e","brand":"SV","offers":[{"title":"Default Title","offer_id":53796762845527,"sku":"SV-SDT-212-2","price":195.58,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1015\/4360\/8663\/files\/SDT-212-2.jpg?v=1781603755","url":"https:\/\/www.sussex-vision.co.uk\/products\/logmar-4m-etdrs-chart-2-revised","provider":"ESP\/SV","version":"1.0","type":"link"}