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Refractive error
Refractive error refers to an eye disorder.
There are several clinical manifestations of refractive errors, such as myopia, hyperopia, or astigmatism, all of which fall under the category of refractive errors. The normal adult eye axis is approximately 24mm, and patients with refractive errors have eye axis measurements that are greater or less than this value, which prevents images from being clearly presented on the retina. In patients with myopia, images generally appear in front of the retina, while in patients with hyperopia, images typically appear behind the retina. Various types of refractive errors can be corrected by wearing glasses to improve vision, enabling patients to see clearly. Additionally, patients with myopia and astigmatism can also consider laser surgery treatment after reaching adulthood.
What is refractive error?
Refractive errors in ophthalmology include myopia, hyperopia, and astigmatism. The optical principle behind these is that parallel light rays, after passing through the optical system of the eyeball, do not focus on the retina, and therefore do not form a clear image. This condition is known as a refractive error. In everyday life, some people mistakenly believe that presbyopia is also a refractive error, but presbyopia is not a refractive error; it is a physiological condition. The common refractive errors are the three types I just mentioned: myopia, hyperopia, and astigmatism.