Sight distance refers to the distance between the eyes and the writing plane, which can be adjusted according to the individual's height, sitting posture and writing habits. The sight distance should be kept at a relatively fixed position to ensure that the eyes can clearly see the contents of the writing, and at the same time, they will not be too tired.
When writing with a pen, you should focus on the writing point, keep the line of sight perpendicular to the writing plane, and pay attention to adjusting the sitting posture and sight distance to avoid eye fatigue and discomfort. In addition, keep your hands stable and comfortable when writing to avoid hand fatigue and discomfort.