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Under the Industrial Accident Compensation Insurance Act, ‘disability’ refers to a state of physical or mental damage that remains permanently as a result of a worker’s work-related injury or disease not being completely cured even after the injury or disease has been cured. ‘Aggravated disability’ refers to a person who already had a physical disability (existing disability) having a new disability added due to a work-related accident, resulting in the existing disability in the physical disability rating table becoming more severe than the existing disability. At this time, existing disabilities are a concept that includes all disabilities that existed before a new work-related accident occurred, regardless of whether it was congenital, acquired, or work-related. However, if the existing disability does not reach level 14 in the disability rating table, it is not treated as an existing disability, and even if the disability becomes slightly more severe, it is not aggravated unless the disability level increases. The reason for having this aggravated disability system is, first of all, to compensate only within the limit when the degree of disability becomes severe due to a work-related accident. For example, if an injured person falls under Class 10, Category 11 due to a clear impairment in the function of the wrist joint of one arm, and falls under Class 5, Category 2 due to an accident in which he or she loses the wrist joint of the same arm again, compensation equivalent to the difference between the existing disability grade and the existing disability grade is provided. Another reason is that if the disability is aggravated in relation to the existing disability, the existing disability becomes more severe and the degree of the worker's labor loss becomes much greater. In such cases, the purpose is to provide more appropriate compensation. For example, if a worker who previously lost sight in one eye and falls under Class 8, No. 1 on the disability scale loses sight in the other eye due to another accident, if an aggravated accident is not applied, Class 8, No. 1 must be recognized. However, if this is judged to be an aggravated accident and is determined in the physical disability rating table and Jindunun's blindness disability level is recognized as level 1, number 1, compensation will be received minus the existing disability level level 8, number 1, and the compensation will be much higher than if there was no existing disability.