Example of common tests using a color change:
(1) urine dipstick
(2) Clinitest for urinary reducing substances
People with problems in color vision:
(1) hereditary color blindness
(2) acquired color blindness
(2a) diabetes mellitus (typically a blue-yellow defect)
(2b) retinitis pigmentosa
(2c) toxic retinopathy
Mitigating the adverse effects:
(1) Screen a person for color blindness as part of the test orientation and periodically thereafter if the person has a progressive disease.
(2) Determine the severity of the color blindness and the colors affected.
(3) Read the test in a bright light (associated with fewer errors than if read in dim light).
(4) Have a non-color blind person read the reaction.
(5) Have a machine read the reaction.
(6) Select a detection system with a color within the person's visual range.
