Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included. Ishihara Colour Vision Book 10 plate. This series of 10 plates is to detect colour blindness in persons aged 4 to 6 or for persons who are unable to read. To stop the colours from fading, keep book closed when not in use and avoid strong light. Instructions included.