I. Determine the threshold visual acuity: 1, with the: 0,10 or less low vision threshold visual acuity table to find out the threshold visual acuity, visual markers can be children like, recognize animals, animated characters, fruits or furniture, 2, do not cooperate: not to check the visual acuity, according to 0,05 or less very low vision custom threshold visual markers amblyopia instrument training II, the choice of low vision non-cooperative children special hooded binocular monovision instrument, with the following characteristics 1, amblyopia instrument structure 1, binocular: can slow down the aggravation of eye tremor caused by monocular gaze. Can produce parallax stereogram or no parallax plane, 2, hood type: can cause absolute dark environment for both eyes, so that training around the eyes are black, only the icon is light, so as to actively or passively attract children to look at and follow the icon, dark environment can significantly slow down the eye tremor: 3, prism so that the pupil distance can change to 40 a 50mm: 4, thickened sponge pad, so comfortable to wear 5, warm and odorless: 6, can be equipped with On the children’s songs or music that young children like. 2.Operation prompting voice design: parents can be prompted to programmed operation, or manual personalized operation, to ensure the quality of vision enhancement. Third, the use of Dr. Eye “eye-mask” 4-5 generation high-precision amblyopia treatment instrument amblyopia instrument in the vision enhancement training icons and color scale design: 1, can be personalized, that is, according to the low vision found or not found when the compromise value of 0, 05 customized personalized threshold vision enhancement training icons: 2, the threshold icon can be recognized by young children or The perspective of the graphic visual marker is designed with reference to the international standard visual acuity table e word visual marker perspective calculation formula: 3, there can be moving rgb color marker or raster background or flying dot color marker and other vision enhancement functions.