Light brush therapy device is a new type of optical instrument in amblyopia treatment. At present, there are small light brushes for home use, as well as light brushes attached to simultaneous machines and comprehensive amblyopia treatment devices and those for use in hospitals. The light brush therapy device is based on the instantaneous Hedinger’s brush effect. The brush effect is seen continuously when the patient looks at the bright light through a rotating blue polarized glass plate. The brush effect is only seen in the central macula, which is the most visually sensitive area. Light brush therapy can be used to treat both paracentral gaze amblyopes and abnormal retinal counterparts, with clinical efficiency of 50% – 70%. The first step is to make the child look at the concentric circles and see the brush effect: the brush is slightly darker than the surrounding background, violet-blue in color, and slowly rotating. Since the background of the entire visual field is blue, the child can see the “light brush” and then gradually narrow the variable light bar straight through, forcing the amblyopic eye to gradually shift from paracentral gaze to relative central gaze, until the central gaze. When the child can see the “light brush phenomenon” in the concentric circles and circles, it means that its gaze point has moved to within 3ºof the macula. The child may see the propeller of the airplane rotating, and the point of gaze has moved to the central concave. As the child’s interest in gazing at the turning of the aircraft propellers increases, the efficacy of the treatment can be improved and consolidated. Light brush therapy is performed for 5-10 minutes per monocular fixation, 1-2 times per day. Most children can achieve satisfactory results after three months of training.