Astigmatism is usually due to uneven curvature or thickness of the cornea of the eye, causing the light entering the eye to be inaccurately focused on the retina at the back, resulting in symptoms of blurred, distorted, and double vision of objects.
Under normal circumstances, our eyes are spherical, much like a basketball. The surface curvature of different sections is perfectly uniform, allowing the image to be projected onto the retina preparedly. In contrast, the eyes of astigmatism patients change from the original spherical shape to a rugby ball shape; their corneal refraction interface curvature is not even, resulting in the different refractive ability of the eye in different directions. Parallel light rays are refracted through the eye, forming multiple focal points, hence blurred seeing and double vision.
Nearsightedness or Presbyopia
1. Scientific studies have shown that astigmatism is present in most people, even those with normal vision. Because we blink up and down, the horizontal axis of the eye is longer than the vertical axis, and there is usually about 50 degrees of physiological astigmatism, which is normal, does not affect life, and does not require treatment.
2. Nearsightedness and astigmatism are two eye diseases mainly caused by refractive errors in the eyes. Irregular eye habits can cause nearsightedness along with astigmatism. Ordinary people have about 50 degrees of physiological astigmatism, so the process of nearsightedness formation will cause astigmatism to deepen, affecting vision. Therefore, for most nearsighted patients, astigmatism often occurs along with nearsightedness.
Astigmatism glasses contain prescription lenses made to correct astigmatism in the eyes. First, astigmatism, like nearsightedness and presbyopia, is a common eye disease. Most importantly, these diseases are irreversible, which means that there is no cure once we suffer from nearsightedness, astigmatism, or presbyopia.
So, the answer is obvious: astigmatism cannot be cured or fixed. When you discover astigmatism, the main task is to measure your astigmatism prescription as soon as possible and accurately and then wear the right astigmatism correction glasses.
Before buying astigmatism glasses, we need to know about the prescription, and the essential part of the prescription is the prescription data. Typically there is a table on our prescription sheet, and the second column under the heading "CYL" or "Cylinder" is the measured astigmatism data, distinguishing between left and right eyes. To know the other data in the prescription form, you can refer to How to Read Prescription (RX).
As eyewear technology continues to evolve, more and more formerly complex production processes have become commonplace, including prescription eyeglass lenses. Therefore, we highly recommend that patients with astigmatism less than 400 degrees go online to make their purchases. On the one hand, these astigmatism lenses have become very common and do not require additional attention. On the other hand, you can no longer be fooled by store salespeople when buying these simple astigmatism glasses; they are more cost-effective.
People who can buy astigmatism glasses online need to be able to: