Amblyopic children are often accompanied by ametropia to varying degrees. Ametropic amblyopia and anisometropic amblyopia account for about 50% ~ 70% of all amblyopia, and ametropia is often an important factor in forming amblyopia, especially high hyperopia, astigmatism and anisometropia. Correcting ametropia of amblyopia is to make the retina obtain clear images and normal visual stimulation through optical means, which is the premise of treating amblyopia. In some cases, even low-grade ametropia (such as astigmatism and Anisometropia of 0.75D) has correction significance.

For the refractive status of amblyopic children and the nature and degree of refractive error, refraction should be performed under complete paralysis of ciliary muscles, commonly known as "mydriatic refraction". See the amblyopia diagnosis chapter for the refractive examination method.

Objective optometry and subjective optometry can be carried out after ciliary muscle paralysis to obtain the accurate diopter of the tested eye. At the same time, after the efficacy of ciliary muscle paralysis agent disappears, refractive examination under the small pupil can be carried out to evaluate the adjustment state of the tested eye. Try it on according to the actual situation of the subject and give a prescription for glasses.

The principle of hyperopia correction for amblyopic patients: the adjustment function of amblyopic eyes is often abnormal. The deeper the amblyopia is, the worse the adjustment function is. Hyperopia of patients with severe amblyopia should be corrected completely; Moderate amblyopia patients can be under corrected appropriately; Patients with mild amblyopia can be given appropriate undercorrection for hyperopia according to the treatment principle of children with normal vision.

Astigmatism correction principle for amblyopia patients: as for children with normal vision, if the patient's vision is not reduced, and there are no visual fatigue and visual interference symptoms, mild astigmatism can not be corrected. If one of the above two symptoms appears, whether astigmatism is mild, moderate or high, it should be corrected. After the correction of high astigmatism, the patient may feel that the visual object is deformed. At this time, the astigmatism degree can be appropriately reduced, and under correction can be given. After the patient adapts, complete correction can be given.

There are many ways to correct ametropia, the most common one is to wear frame glasses, which is safe and convenient, and is an effective treatment. In addition, it is also possible to consider the correction of corneal contact lens, which has certain applications in the correction of amblyopia patients due to its optical advantages such as small aberration, large field of view and no prism effect. Ametropia correction of amblyopia some clinical reports can be performed with corneal refractive surgery, etc., which can only be used in special cases.