What are the symptoms of astigmatism in the eyes
What is astigmatism? Astigmatism refers to the fact that after the parallel rays are refracted by the refractive system of the eyeball, they do not converge into a single point, but many light images that are scattered, so it is called astigmatism. Astigmatism is more common in children, and generally the sooner it is corrected, the better, and the easier it is to treat. The symptoms of astigmatism can help parents to detect and treat their children's vision early.
1. Vision loss:
The color of the optographic target in the direction of the focal line of the astigmatism away from the retina becomes lighter, the edges are blurred, and it is not easy to recognize, and the vision decreases, and in severe cases, diplopia occurs. In addition to physiological astigmatism, all kinds of astigmatism can easily cause vision loss. Hyperopic astigmatism has better visual acuity than myopic astigmatism due to accommodation.
For example, the same 1.00 degree astigmatism, farsighted astigmatism is generally about 0.8; The visual acuity of myopic astigmatism is generally about 0.5; When oblique astigmatism is used to look at the optoscope, the optoscope is prone to deformation. The phenomenon of "long hair" is often due to deformation and weakened vision. Therefore, the correction of the axis position of oblique astigmatism is particularly important.
2. Visual fatigue:
Due to the different refractive power of each meridian, the astigmatism cannot form a focal point for the refraction of parallel rays, but two focal lines, so the brain is prone to selective reading of objects. The reason is that astigmatism tends to produce scenes in the direction of the focal line of the myopia; In addition, in order to see the scenery relatively clearly, the astigmatism should be adjusted as much as possible to reduce the size of the diffusion circle to improve the quality of the image; High astigmatism can easily cause headaches if not corrected properly or without glasses. Symptoms such as eye fatigue, so astigmatism can easily produce eye fatigue.
3. Blurred vision, often with closed eyes:
In slightly heavier cases, both distant and near-sighted, the sensation is blurred, and patients often have the habit of half-closing the eyelids into slits in an attempt to make the object more clearly.