The non-surgical clinical treatment methods of binocular fusion abnormalities in optometry are mainly divided into two types: first, optical correction; Second, visual rehabilitation training guidance.

Optical Correction

Optical correction includes refractive correction, additional spherical mirror and additional prism.

Ametropia correction

1. The influence of refractive state on binocular vision

Uncorrected refractive state: uncorrected myopia does not use or uses less adjustment when looking close, but in order to maintain binocular fusion image, binocular fusion image collection is started, resulting in collective fatigue. In order to reduce the degree of fatigue, feedback exophoria occurs; Uncorrected hyperopia must pay more adjustment when the collective demand remains unchanged, resulting in adjustment fatigue. In order to reduce the degree of fatigue, feedback implicit deviation occurs.

Improper refractive correction: if the spherical lens luminosity, cylindrical lens luminosity and cylindrical lens axis of the corrected glasses do not adapt to the refractive state of the wearing eye, new binocular visual abnormalities may occur. For example, if the myopia is overcorrected, the adjustment tension increases when looking far and near the target. Too much adjustment collection can induce implicit deviation, which brings abnormal fusion collection demand and leads to more serious visual fatigue.

Proper refractive correction: if the parameters of corrective glasses are consistent with the patient's refractive state, there is still a transient binocular visual abnormality. For example, when the correction of myopia is appropriate, due to the increased adjustment tension when looking close, the new adjustment set can induce a transient implicit deviation, which can cause mild visual fatigue symptoms. However, the adjustment and collective response of close work have feedback coordination space within a certain range. If the photometric intensity of corrective glasses is appropriate, the eye position of most patients will return to the normal range after continuous wearing for 4 ~ 6 weeks.

2. Principles of refractive correction

Platform function of refractive correction: refractive correction can directly correct a certain amount of adjustment and aggregation abnormalities. At the same time, it can be used as a platform for binocular visual abnormality processing, and provide basic conditions for other additional spherical mirrors, prism relief and visual rehabilitation training.

Relationship between refractive correction and binocular vision: it is generally believed that hyperopia, myopia, astigmatism and anisometropia > 0.75D have clinical correction value and should be properly corrected. However, the size of ametropia is not the main cause of binocular visual abnormalities. The main diagnostic indicators of binocular visual abnormalities include adjustment amplitude, adjustment response, positive and negative relative adjustment, adjustment flexibility, far eye position, near eye position, long-distance and short-distance cohesion and dispersion, aggregation amplitude, AC / A, etc.