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儿童因为种种原因,从小视力就很差,但眼球外表与内部检查均正常,无任何器质性病变,远视力低于0.8(对数视力表为4.9)而且用眼镜不能矫正者,临床上称为弱视。弱视的原因主要是由屈光不正和斜视引起。大多数学者目前认为,弱视的危险期是1～3岁。因此,对学龄前儿童进行广泛的视力普查是非常必要的,因为治疗弱视的关键是早期发现与及时矫正。
Children due to various reasons, childhood vision was poor, but the eye appearance and internal examination were normal, no organic disease, far vision less than 0.8 (logarithmic visual acuity chart 4.9) and can not be corrected with glasses, said clinically For amblyopia. The cause of amblyopia is mainly caused by refractive errors and strabismus. Most scholars now believe that the risk of amblyopia is 1 to 3 years old. Therefore, a wide range of visual census of preschool children is very necessary, because the key to treatment of amblyopia is early detection and timely correction.