color blindness defect and medical laboratory technologists: unnoticed problems and the care for screening

color -blindness is the inability to perceive differences between some color that other people can distinguish. using a literature search , the results indicate the prevalence of color vision deficiency in the medical profession and its on medical skills. medical laboratory technicians and technologists employees should also screen for color blindness. this research aimed to study color blindness prevalence among hospitals' clinical laboratories' employees and students in tehran university of medical sciences (tums). a cross- sectional descriptive and analytical study was conducted among 633 tums clinical laboratory sciences' students and hospitals' clinical laboratories' employees to detect color - blindness problems by ishihara test. the tests were first screened with certain pictures, then compared to the ishihara criteria to be possible color defective were tested further with other plates to determine color - blindness defects. the data was saved using with spss software and analyzed by statistical methods. this is the first study to determine the prevalence of color - blindness in clinical laboratory sciences' students and employees. 2.4% of tums medical laboratory sciences students and hospitals' clinical laboratories' employees are color- blind. there is significant correlation between color - blindness and sex and age. but the results showed that there is not significant correlation between color -blindness defect and exposure to chemical agents, type of job , trauma and surgery history, history of familial defect and race. it would be a wide range of difficulties by color blinded students and employees in their practice of laboratory diagnosis and techniques with a potentially of errors. we suggest color blindness as a medical conditions should restrict employment choices for medical laboratory technicians and technologists job in iran.