subjective inspection

Most of the examinations for color blindness and color weakness are subjective inspections, which are generally performed under brighter natural light. Common methods for measuring color blindness are color line test, color mixing tester, and false color map. False homochromatic map: commonly referred to as the original, it is a point or a figure that uses the same shades of color and different colors to form a number or figure, and is read at a distance of 0.5 m under natural light. The color blindness should be corrected, and each picture should not exceed 5 seconds. Color vision disorders are difficult to identify, misread or impossible to read, and can be confirmed according to the color blindness table. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Be in bright natural light. Normal value Can not distinguish the red is called red blind or first color blindness, the red part is shortened in the spectrum, green is yellow, purple is blue; can not distinguish green is called green blind or second color blind, in the spectrum green is seen as Gray or dark black; blue is not known as blue blind or third color blind. Clinical significance Abnormal result The color can not be discerned at all, and the black and white feeling of the object is called full color blindness or monochrome vision. Often accompanied by high photophobia, frequent blinking, significant loss of vision, dark spots in the center, blindness and so on. Patients with color blindness and color weakness need to be examined. Precautions Taboo before inspection: It is a defect that should be dealt with in a timely manner. Requirements for inspection: Be in bright natural light. Inspection process False homochromatic map: commonly referred to as the original, it is a point or a figure that uses the same shades of color and different colors to form a number or figure, and is read at a distance of 0.5 m under natural light. The color blindness should be corrected, and each picture should not exceed 5 seconds. Color vision disorders are difficult to identify, misread or impossible to read, and can be confirmed according to the color blindness table. Not suitable for the crowd Inappropriate people: There is no special explanation, one of the medical examinations.