How to wear glasses for myopia and astigmatism

In fact, most people don’t understand the difference between myopia and astigmatism. They just think that if they have myopia problems, they will see things blurry. In fact, many of them are caused by the symptoms of astigmatism, but we don’t understand them. Myopia means blurred vision, while astigmatism actually causes patients to feel visual fatigue. Patients often have the habit of half-closing their eyelids and squinting them into slits in an attempt to see objects more clearly. So how do you add astigmatism to myopia lenses when fitting glasses?

The configuration of first astigmatism plus myopia.

Subtract half of the astigmatism and add it to the myopia. For example, if you have 100 degrees of astigmatism and 500 degrees of myopia, then reduce the astigmatism by half and add it to the myopia, and the final degree of glasses will be 550 degrees. In fact, the problem of astigmatism has not been solved, it has only deepened the degree of myopia. The degree of astigmatism is like the degree of myopia. It is a calculation method that indicates the degree of astigmatism. However, the degree of astigmatism is not the same as the degree of myopia. Astigmatism of 75 degrees or above requires correction with astigmatism lenses.

Symptoms of secondary astigmatism.

Visual fatigue: Astigmatism causes the parallel light rays to be refracted into two focal lines instead of focusing due to the different refractive powers on each meridian, so the brain tends to selectively interpret the image. Decreased vision: In an astigmatic eye, the color of sight marks in the direction of the focal line away from the retina becomes lighter, the edges become blurred, and it is difficult to identify, resulting in decreased vision and, in severe cases, double vision. For those with more serious symptoms, both distant and near objects appear blurred. Patients often have the habit of half-closing their eyelids and squinting them into slits in an attempt to see objects more clearly. Squinting often. In order to see distant targets clearly, patients with high astigmatism often like to squint, frown, or pull their eyelids themselves to achieve the effect of pinhole lenses and slit lenses to improve their vision.

Third, the harm of astigmatism .

Ordinary lenses can only correct regular astigmatism, but cannot correct irregular astigmatism. The best way is to use hard corneal contact lenses to correct it, which has better effects. The effect of correcting regular astigmatism with ordinary lenses is also different. The greater the degree of astigmatism, the worse the effect. Astigmatism below moderate can generally be corrected to normal values, while high astigmatism is more difficult to correct to good results. Especially for high hyperopic astigmatism, the person cannot rely on adjustment to see objects clearly both far and near. If it is not corrected early in early childhood, the development of visual function will be inhibited to a certain extent. When the child grows up and wears corrective glasses, the corrected vision will be worse, often resulting in moderate amblyopia. High myopia and astigmatism are better. Although distant vision is not clear, near vision is still better. The visual function can also be exercised to a certain extent and is not completely suppressed. Corrected vision is generally better than high hyperopia and astigmatism. But you also need to get glasses for correction as soon as possible. Regardless of the degree of astigmatism, the sooner it is corrected, the better the results. Because correction is done early, it not only promotes the development of visual function, but also reduces the error response to object deformation and spatial positioning, which the patient can tolerate to a greater extent.