In clinical practice, the main treatments for unmodulated strabismus are surgical correction and trigeminal correction. Parents have a bellyful of questions about how to choose these two treatments. For non-modulated strabismus in children with a clear diagnosis of horizontal strabismus ≥15△ and vertical strabismus ≥10△, surgical correction is in principle possible. Especially for children whose binocular stereo vision function is affected, early surgical correction can help re-establish binocular vision function. According to the law of object displacement and the size of strabismus, trigonometric prisms are placed in front of the strabismic eye and the degree of trigonometric prisms is changed until the external object is imaged in the macula of the strabismic eye and the binoculars have a common visual direction, and the diplopia can be eliminated. This is the basic principle of trigeminal correction strabismus, mainly as an auxiliary treatment to achieve the purpose of correcting strabismus, eliminating diplopia and relieving visual fatigue. Specific indications are as follows: 1, strabismus surgery after overcorrection or undercorrection, with trigeminal correction residual strabismus degree: residual strabismus degree after surgery is often unstable, you can wear trigeminal correction, observation, and then consider the second surgery and other further treatment after the eye position is stable. 2.Smaller degrees of strabismus in children: children with smaller degrees, not reaching the indications for surgery, can use trigeminal lenses for correction, to help children in the critical period of visual development, the establishment of good stereo vision function. 3, younger children who cannot cooperate with the various strabismus degrees before surgery: because the surgery cannot be accurately designed, the child’s binocular visual function development is protected by wearing trigeminal lenses. As a transitional treatment before surgery. 4.Children with unstable strabismus: When the preoperative examination reveals that the child’s strabismus is unstable and cannot be operated accurately, the child can be given trial trigeminal lenses of different degrees to conduct tolerance experiments and help determine the surgical plan. 5.Idiopathic nystagmus: Children with nystagmus accompanied by strabismus and compensated head position can improve compensated head position by wearing trigeminal lenses. 6, not suitable for strabismus surgery, special types of strabismus: symptomatic occluded strabismus, convergence insufficiency or convergence paralysis, retrobulbar syndrome, trauma-induced paralytic strabismus, etc. Trigonometry itself has certain limitations, such as thick lenses, the ability to fit only up to 7Δ in one eye, and distorted vision. These problems also limit the use of trigonometry in clinical practice. In recent years, we have introduced a kind of film-like pressed trigonometry, which is a special plastic film, only 0.5 mm thick, and can be pressed on the ordinary lens. With the use of this kind of prism, the strabismus can be corrected up to 30△ in one eye. Because of the reflective effect of the prism, wearing a large number of film-pressed prisms can cause a loss of central vision and cannot be a complete clinical substitute for traditional trigonometry. After all, this technology makes up for the lack of material of glass or resin prisms and allows for a wider range of applications for trigonometry in the correction of strabismus.