Ishihara Clour Blindness 24 Plate Book
The Isihara plates represent the most widely used colour vision deficiency test, still utilised by most optometrists and ophthalmologists around the world.
This robust, high-quality 24-plate book includes the following plate types, quality printed for correct contrast and colour balance:
• Vanishing design: Only people with good colour vision can see the sign; colour blind individuals will not be able to see it.
• Transformation design: Colour blind people will see a different sign.
• Hidden digit design: Only colour blind people will be able to spot the sign.
• Classification design: This is used to differentiate between red- and green-blindness. The vanishing design is used on either side of the plate -- one side for deutan defects and the other for protans.