Astigmatism sees what things look like.

Clinical manifestations of astigmatic eyes:

1. The blurred image on the retina needs constant fine-tuning, and the visual objects are distorted, so astigmatism eyes, especially hyperopia astigmatism eyes, are prone to visual fatigue. Symptoms are eye pain, tears, headache, especially on the forehead, diplopia, short-distance work can not last long.

2. In order to see more clearly, people with highly asymmetric astigmatism often take an inclined head position, causing strabismus, which can be recovered after correction. Sometimes, in order to get a larger retinal image, patients tend to pull objects closer like myopia patients.

3. People with high astigmatism tend to squint when looking at distant or nearby targets, thus achieving pinholes and cracks to improve their vision. Seeing through pinholes or cracks can reduce the influence of astigmatism on vision.

Extended data:

The cause of disease

1, unequal curvature

That is, the curvature of the refractive body surface of the eye is inconsistent, which mostly occurs in the cornea and can also occur in the lens. Mild astigmatism is considered to be physiological, and the most common is that the vertical curvature of cornea is greater than the horizontal curvature, generally about 0.2D, which is caused by frequent compression of upper and lower eyelids. With the increase of age, this physiological defect has a slight increase trend.

Astigmatism is mostly congenital, and acquired astigmatism is mostly caused by corneal diseases. Such as keratoconus, corneal peripheral degeneration or corneal inflammation, often cause irregular astigmatism. In addition, irregular astigmatism can also be caused by pressing the eyeball after cataract surgery or eyelid tumor.

2. Optical center deviation

Most of them are subluxation or obvious deviation of lens caused by disease and trauma, which causes very obvious astigmatism.

References:

Baidu encyclopedia-astigmatism eye

References:

Baidu Encyclopedia-Clinical manifestations of astigmatism