Ishihara 38 Plate Chart Book for Color Blindness Ultrasound Units Accessories Color: black Undercast Padding Color: black Comes with Reusable Cover * Non powered adjustable and reactive support surface for individuals who require skin soft tissue protection or have other therapeutic needs * Provides individualized pressure shear and friction management through force redistribution to an individual s shape * Cost effective option for different care settings costing less than high qualitypowered mattress systems * Easily cleaned and disinfected for reuse * Flexible interconnected air cells can be adjusted to match the body s contour providing personalized therapy and critical skin soft tissue protection * The SOFFLEX 2 is made of three sections that snap together simply add or releaseair in each mattress overlay section to accommodate the individual s needs * No need for concern of power failure or energy consumption costs * The SOFFLEX 2 is lightweight easy to transport easy to adjust and set up on different bed types * Mattress overlay system size: 36 x 81 Accepted by leading authorities as a simple and accurate method for discovering congenital color blindness and red green blindness each in two forms complete and incomplete * Includes four special plates for tests to determine the kind and degree of defect in color vision * Makes use of the peculiarity that in red green blindness blue and yellow appear remarkably bright compared with red and green * Color plates encased in specially designed album type books for ease of handling * Detailed instructions included