Astigmatism is a refractive irregularity of the eye that is related to the curvature of the cornea. In some eyes, the cornea is more curved in one angular region and flatter in other angular regions. The reason for astigmatism is that these uneven thicknesses or uneven curvatures of the cornea make the refractive index of each meridian of the cornea inconsistent, so that the light passing through these meridians cannot gather at the same focal point and the light cannot be accurately focused on the retina to form a clear image, a condition called astigmatism. Astigmatism diagnosis, low astigmatism, distance and near vision is generally normal; high astigmatism, both distance and near vision is poor, blurred vision, easy visual fatigue; need to go to the hospital for optometry correction, irregular astigmatism can wear RGP for correction. 1.After astigmatism is diagnosed, will the prescription change over time? Most regular astigmatism is due to congenital anomalous changes in the cornea, and there may also be lens astigmatism. There are also some acquired astigmatism, such as eyelids with pinhole or cornea, long-term poor eye posture (such as squinting, rubbing eyes, lying down to read, etc.), so that the eyelid pressure on the cornea will also change the corneal curvature, resulting in astigmatism and increasing the astigmatism. Irregular astigmatism is mainly due to the unevenness of the refractive surface of the cornea, such as corneal ulcer, scar, cone cornea, pterygium, etc. 2.Can I get astigmatism without glasses? Astigmatism is diagnosed as low astigmatism with normal distance and near vision, while high astigmatism with poor distance and near vision, blurred vision and easy visual fatigue. You need to go to the hospital for optometry and prescription correction. Irregular astigmatism can be corrected by wearing RGP according to medical advice. 3, what is the degree of astigmatism grading astigmatism according to the degree: 200 degrees or less for mild astigmatism, 200-400 degrees for moderate astigmatism, 400 degrees or more for severe astigmatism. 4. Which is more serious, astigmatism or myopia? The difference between astigmatism and myopia is that astigmatism and myopia are both manifestations of refractive error, but the difference is that myopia is the inability to see things in the distance that can be seen in the near, while astigmatism is the inability to see far and near with double vision. Astigmatism and myopia are two kinds of diseases, there is no who is more serious to say. 5.How to treat astigmatism myopia? Myopia is a condition in which distant objects do not converge on the retina under the premise of refractive rest, but form a focal point in front of the retina, thus causing visual distortion and blurring of distant objects. Astigmatism and myopia can be corrected by wearing frames and contact lenses or even myopia surgery, please go to regular hospitals and opticians for examination and prescription. 6.What is the difference between astigmatic and myopic lenses? Myopia refers to the growth of the eye axis, the focus of external light through the eye in front of the retina, so to myopia is added concave lens. Astigmatism refers to the fact that parallel light entering the eye cannot form a focal point but becomes two focal lines, so the lens added to astigmatic eyes is a column lens. 7.What does astigmatism look like? Mild astigmatism is only the edge of the object is not clear, moderate and high astigmatism will see the object will appear heavy shadow, but whether the distance is far or close, astigmatic eyes are difficult to see the object most clearly. 8. Can I wear contact lenses with astigmatism and how do I get contact lenses? Soft contact lenses have the principle of astigmatism conversion, astigmatism below 75 degrees, myopia divided by astigmatism greater than 4 can be converted to wear non-astigmatism contact lenses. Astigmatism under 150 degrees, myopia divided by astigmatism greater than 3, can be converted to toric-free contact lenses. The rest of the cases require toric contact lenses. Rigid contact lenses RGP correct astigmatism by filling the space between the cornea and the lens with tears, ensuring clear vision. Please go to a regular hospital for fitting. 9. Do I need to wear astigmatism glasses all the time? Low astigmatism has normal distance and near vision; high astigmatism has poor distance and near vision, blurred vision and easy visual fatigue; need to go to the hospital for optometry and correction, irregular astigmatism can wear RGP for correction 10, how to correct and treat hyperopic astigmatism? Farsighted astigmatism is a refractive error. It can be corrected through correct wearing of frame glasses, contact lenses, keratomileusis, and even excimer laser surgery. 11.Can hyperopia and astigmatism be corrected with glasses? Farsighted astigmatism is a refractive error. It can be corrected to normal vision through correct wearing of frames, keratomileusis, and even surgical correction.