What is the difference between cylinder and myopia?
There are essential differences between astigmatism and myopia, as follows:
1. Myopia: refers to that when the eye sees something, after the object is imaged and focused, it is focused in front of Macula through the front cornea, lens and vitreous body;
2. Astigmatism: mainly refers to the uneven refraction of light on the surface of the eyeball, where the refractive index of light on such a line is different from that on another line, resulting in two intersections not being at the same point after imaging. Astigmatism includes mild astigmatism and severe astigmatism. If it is mild astigmatism, for example, most normal people will have mild astigmatism. 25 degree astigmatism and 50 degree astigmatism have little impact on vision. If the patient has a high degree of astigmatism, such as 200 degree or even 300 degree astigmatism, it can have a significant impact on vision and cause blurry vision. When wearing glasses, astigmatic glasses should be worn.
Some patients have both myopia and astigmatism, and when doing myopia laser, most patients do myopia laser. If the patient is accompanied by astigmatism, it is also necessary to treat both myopia and astigmatism.
