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For a successful newsletter campaign all materials, information and data that you use must be orderly, consistent and clear.

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Dr Shinobu Ishihara introduced in 1917 the most well known color blindness test. Each of his tests consists of a set of colored dotted plates, showing either a number or a path. Since then this is the most widely used color vision deficiency test and still used by most optometrists and ophthalmologists.