{"product_id":"tavole-ishihara-38-tavole","title":"Ishihara Plates - 38 Plates","description":"\u003cp\u003e\u003cstrong\u003eSeries of plates designed to provide a quick and accurate test for the determination of congenital color vision deficiency, the most common form of color vision disorder.\u003cbr\u003e\u003c\/strong\u003eIshihara plates are generally used for the detection of color blindness and achromatopsia. This consists of 38 plates contained in a book with black-background pages, filled with circles of different colors but the same brightness. \u003cbr\u003eThey feature numbers, paths to be followed with a pencil for children or illiterate individuals, and confusion plates, where only those with altered color vision can see numbers. \u003cbr\u003eThese plates are useful for diagnosing congenital color vision defects, especially for the red\/green axis.\u003cbr\u003eThey should be read at a reading distance of 30-40 cm, with near correction for some subjects, and under adequate lighting. \u003cbr\u003eThe test can be performed both monocularly and binocularly.\u003cbr\u003e\u003cbr\u003eThe examination of the chromatic sense occurs through the discrimination of colors different from the background and the 10a signs. \u003cbr\u003eIshihara plates are used for the diagnosis of dyschromatopsia, in optic neuropathies, and in congenital or acquired maculopathies.\u003cbr\u003e\u003cbr\u003e10a: the different colors are located on the same confusion line. They detect:\u003cbr\u003e- \u003cspan style=\"text-decoration: underline;\"\u003eProtanopia (red)\u003c\/span\u003e: The visible range of the spectrum in the red is shorter than normal, and the part of the spectrum that appears blue-green to a normal observer appears gray to those affected by protanopia.\u003cbr\u003e- \u003cspan style=\"text-decoration: underline;\"\u003eDeuteranopia (green)\u003c\/span\u003e: The part of the spectrum that appears green to those with normal vision appears gray, and the visible range of the spectrum is divided by this zone into two areas, each of which appears different. The visible range of the spectrum is not contracted, in contrast to protanopia. Red-purple, the complementary color of green, also appears gray.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eTechnical specifications:\u003cbr\u003e\u003c\/strong\u003e\u003cspan style=\"text-decoration: underline;\"\u003ePlate details:\u003c\/span\u003e\u003cbr\u003e- The first plate contains the number 12 and is not pseudoisochromatic. It serves to demonstrate the test and is read even by those with poor color vision.\u003cbr\u003e- From plate 2 to plate 17, the numbers are read poorly or not at all by those with color vision anomalies in the red\/green axis.\u003cbr\u003e- Plates 18-21 do not contain numbers, which are instead read by those with a red\/green deficiency.\u003cbr\u003e- Plates 22-25 are the most interesting, as they allow for distinguishing true color blindness (protanopia or deuteranopia depending on whether it is for red or green) from partial blindness (protanomaly or deuteranomaly).\u003cbr\u003e- From plate 27 to 38, the numbers are replaced by paths for illiterate individuals, with the same significance as reading the numbers.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSupplied with:\u003c\/strong\u003e\u003cbr\u003e21 Numerical plates\u003cbr\u003e17 Plates featuring paths to be followed with a pencil and confusion plates\u003cbr\u003e\u003cbr\u003e⚠️\u003cstrong\u003e\u003cem\u003eThe 2019 and 2024 editions are identical in all material – contents, plates, and charts – and differ exclusively in the year of production shown.\u003c\/em\u003e\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Gima","offers":[{"title":"Default Title","offer_id":49646159823184,"sku":"DG0004681","price":137.2,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0866\/3996\/8592\/files\/DG0004681.png?v=1765528892","url":"https:\/\/www.cfs.it\/en\/products\/tavole-ishihara-38-tavole","provider":"CFS Prodotti Medicali s.r.l.","version":"1.0","type":"link"}