Pramanik T, Sherpa M T, Shrestha R
Department of Physiology, Nepal Medical College, Jorpati, Kathmandu, Nepal.
Nepal Med Coll J. 2010 Jun;12(2):81-3.
Color vision deficiency, most of the time remains an unnoticed problem; although it is not very rare. The faculty of appreciation of color is essential for our smooth daily activities. Unfortunately, even many doctors do not know the severity of their color vision deficiency and tend to assume it as slight, and a few, as in the general population, do not know about their disability. Some common difficulties reported by medical practitioners and medical students were in recognizing- widespread body color changes (pallor, cyanosis, jaundice, rashes, erythema of skin), colorful charts, slides, test-strips for blood and urine, body products: blood or bile in urine, faeces, sputum, vomit, microscopy, mouth and throat conditions, impressions presented in the Ishihara chart, titration end-points, tissue identification (surgery) etc. The present study was undertaken to evaluate the presence of congenital color vision deficiencies among the medical students. The study was carried out among the 1st and 2nd year medical students of Nepal Medical College and Teaching Hospital (n= 120) with the help of Ishihara chart, that was shown to all participants. They were asked to read the impressions in the color chart. The impression perceived by a person with normal color vision was different from the impression perceived by a person with color vision deficiency. It was noted that, among the study population (n=120) 5.83% of the volunteers were color weak. Amongst the color-deficient volunteers, 57.0% were protanopic while 43.0% were deuteranopic. Medical students must be made aware of their congenital color vision deficiency and its effects on their work. Screening will enable the student and later the doctor to become aware of limitations in their powers of observation and devise ways of overcoming them; the patient will be protected from harm and litigation may be avoided when doctors have adapted their practice to their deficiency. Medical students and physicians must be screened for color vision deficiency and advised about it so they can take special care in clinical practice.
色觉缺陷在大多数情况下仍是一个未被察觉的问题，尽管它并不十分罕见。对颜色的感知能力对我们日常的顺利活动至关重要。不幸的是，甚至许多医生都不知道自己色觉缺陷的严重程度，往往认为其程度较轻，而且和普通人群中的一些人一样，有一部分医生根本不知道自己有这种缺陷。医学从业者和医学生报告的一些常见困难包括：识别广泛的身体颜色变化（面色苍白、发绀、黄疸、皮疹、皮肤红斑）、彩色图表、幻灯片、血液和尿液检测试纸、身体产物（尿液、粪便、痰液、呕吐物中的血液或胆汁）、显微镜检查、口腔和咽喉状况、石原氏色盲检查表中的图像、滴定终点、组织识别（手术中）等。本研究旨在评估医学生中先天性色觉缺陷的情况。该研究在尼泊尔医学院和教学医院的一年级和二年级医学生（n = 120）中进行，借助石原氏色盲检查表向所有参与者展示。要求他们读出色盲检查表中的图像。正常色觉者所感知的图像与色觉缺陷者所感知的不同。结果发现，在研究人群（n = 120）中，5.83%的志愿者为色弱。在色觉缺陷的志愿者中，57.0%为红色盲，43.0%为绿色盲。必须让医学生意识到他们的先天性色觉缺陷及其对工作的影响。筛查将使学生以及日后的医生意识到自己观察能力的局限性，并想出克服这些局限性的方法；当医生根据自身缺陷调整临床操作时，患者将免受伤害，也可避免诉讼。必须对医学生和医生进行色觉缺陷筛查，并告知他们相关情况，以便他们在临床实践中特别留意。
