What are the symptoms of refractive error in children's eyes?

Refractive error is divided into myopia, hyperopia and astigmatism. Myopic children can show far vision loss, but myopia is normal, squinting when looking at distant targets. Can show visual fatigue, easy to cause exophoria or exotropia, high myopia, can occur in varying degrees of retinal degeneration changes, such as myopia arc spots, leopard shaped fundus, etc. Hyperopia may manifest itself as visual impairment, typically high hyperopia with blurred vision at far and even less clear vision at near. For low to moderate hyperopia, visual impairment is related to age and hyperopia due to accommodation, prone to visual fatigue, and may produce esotropia or esotropia and amblyopia. Astigmatism may manifest itself as visual impairment, visual fatigue, strabismus and amblyopia.