There is no obvious organic lesion in the eye, but the corrected visual acuity of one or both eyes still cannot reach 0.8 is called amblyopia. Currently, the standard for amblyopia in China is corrected visual acuity ≤ 0.8 or the difference in visual acuity between the two eyes ≥ 2 lines. Amblyopia is an eye disease that seriously endangers the visual function of children, and if left untreated can cause aggravation of amblyopia and even blindness. What are the common causes of amblyopia? 1, refractive error: both eyes have obvious refractive error, in childhood or before school age without correction can occur binocular amblyopia. It is mostly seen in astigmatism, hyperopia, and high myopia. 2, refractive error: one eye or two eyes refractive error, the difference between the two eyes, spherical lens > 3.0D above, columnar lens > 2.0 above, resulting in inconsistent retinal imaging clarity of the two eyes, so the visual center actively inhibit the blurred image, only to respond to the clear image, and over time, the eye with the deeper degree becomes amblyopic, which is refractive parallax amblyopia. 3.Strabismus
This patient has strabismus or had strabismus, and often has refractive error or refractive aberration at the same time. In order to eliminate or overcome diplopia and visual disturbance caused by strabismus, the cerebral cortex inhibits the visual impulses transmitted by strabismus, and the macular function of the strabismic eye is inhibited for a long time to form amblyopia. 4, perceptual disorders: This refers to the early birth for some reasons, affecting the light stimulation into the eye, so that the eye visual function development is inhibited, and gradually formed strabismus and amblyopia. Congenital diseases such as: birth cataract, corneal leukoplakia, ptosis, etc., early after birth eye surgery or trauma for a longer period of time after covering one eye. Amblyopia caused by perceptual disorders compared to the previous ones, the degree of seriousness, treatment difficulties and poor efficacy. 5, other: the cause is unknown, for this kind of amblyopia some people think it is related to the hemorrhage of the fundus and the visual pathway in the neonatal period, nystagmus, congenital total color blindness is also a common cause of amblyopia.