DESCRIPTION The test consists of a number of coloured plates, called ishihara test plates, each of which contains a circle of dots appearing randomized in colour and size. Within the pattern are dots which form a number or shape clearly visible to those with normal colouur vision, and invisible, or difficult to see, to those with a red-green colour vision defect, or the other way around. The full test consists of 38 plates, but the existence of a deficiency is usually clear after a few plates. There is also the smaller test consisting only 14, 24 plates. Individuals with colour vision defect should see a different figure from individuals with normal colour visionMakes use of the peculiarity that in red-green blindness, blue and yellow appear remarkably bright compared with red and greenDiagnostic plates: intended to determine the type of colour vision defectIshihara test chart books for colour deficiency 38 plates with usar manual SHIPPINGInternational orders will be shipped by India Post International order will take 11-25 business days to deliver goods worldwideFor express shipping please write to us.If your product is undelivered with in specific time period, we would like to request you please write us once before opening, item not received case. So we can update you about the delivery. RETURN POLICYReturn will be accepted within 15 Days from the Date of Delivery to Buyer. Please write to us before opening any return case. So we can mutually resolve the case.If Any Tax Is Applicable At Buyers Country, Buyer Has To Pay All Such Taxes As Per Law. PAYMENT We Accept Payment Through eCRATER payments Methods. FEEDBACK Please spare a few minutes to submit your valuable feedback. Thanks