1.Pre-operative strabismus Strabismus preoperative adaptation test of pressed and taped trigeminal lenses can help doctors better determine the amount of surgery and improve the success rate of surgery. For younger children or those who are temporarily unable to receive surgical treatment due to physical reasons, they can first have their strabismus corrected by pressing the trigon to establish some binocular vision as early as possible, which is conducive to the maintenance of future eye position and the development of binocular vision. 2. Correction of smaller strabismus. In children with regulated internal strabismus, there are still small degrees of internal strabismus, or other small degrees of vertical strabismus, which are not enough for surgery, or small degrees of strabismus remain after strabismus surgery, which are not enough for secondary surgery, and the examination of the same vision machine finds that both eyes have poor vision. Pressed trigeminal can assist in eye position orthostasis, promote binocular vision development, and avoid face deviation and scoliosis caused by crooked head due to vertical strabismus. 3. Control hidden strabismus in people with visual fatigue. If intermittent exotropia appears as fatigue in the near vision, small-degree compression lenses can be given. 4.Other non-common strabismus. Specific gaze position strabismus, can be in a specific gaze position pressure patch; Ⅲ, Ⅳ, VI cranial nerve palsy, extraocular muscle function recovery process, in order to maintain binocular vision, eliminate diplopia; temporarily can not solve the monocular performance symptoms of obvious DVD patients, can be in front of the performance of an obscure eye pressure patch mirror, so that their vision slightly blurred so as to convert the gaze eye, improve the symptoms. 5. Idiopathic nystagmus. Assist in determining the intermediate band and improving the head position.