How to match contact lens astigmatism?
Astigmatism contact lenses can provide stable and clear vision for patients with astigmatism, and are also very convenient to use and carry. So, how should astigmatism be formulated for contact lenses?
Astigmatism can also be corrected with contact lenses, which generally require custom-made contact lenses. The formation of astigmatism is due to the difference in curvature, which makes it difficult for the light to be refracted to the same focus, so astigmatism patients will have problems such as ghosting when they see things. In order to solve such problems, astigmatic contact lenses add a prism to thicken the bottom of the lens, and rely on the action of gravity to maintain the dynamic stability of the axial position, so as to achieve the purpose of correcting myopia and astigmatism at the same time.
However, not all astigmatism needs to be formulated with astigmatic contact lenses, and the standard of judgment mainly depends on whether it affects normal vision. Generally speaking, when the degree of astigmatism is lower than 75 degrees, there is no need for special astigmatism contact lenses, and ordinary contact lenses can be used according to the degree of myopia.
Before wearing astigmatism contact lenses, it is also necessary to do a comprehensive eye examination to see if there is any disease or inflammation in the eye that is not suitable for wearing contact lenses. At the same time, mydriatic optometry should be carried out to determine the degree of myopia and the degree and axis of astigmatism, and then customize appropriate astigmatic contact lenses with the help of a professional optometrist. It should be noted that the degree of astigmatism cannot be simply converted into the degree of myopia, so as not to bring extra burden to the eyes.
Astigmatism contact lenses are basically the same as ordinary lenses in terms of wearing and care, and even more gentle in cleaning, because the thickness of astigmatic lenses is not uniform, so they are more fragile and vulnerable. In the process of use, you should also go to the hospital to review the fundus condition regularly to ensure eye health.