The SE value refers to the equivalent spherical lens, which is a spherical lens that converts astigmatism into a spherical lens with a similar optical effect, and is not a visual acuity result. SE is called equivalent spherical lenses, which stands for spherical equivalent, and is not a result of visual acuity, but a result of optometry. The so-called equivalent spherical lens is a spherical lens that converts astigmatism into a similar optical effect, which is equivalent to the number of diopters of a spherical lens plus half the number of diopters of astigmatism. Based on the results of the optometry examination, the refractive status of the patient can be determined and the patient can be diagnosed as suffering from myopia, hyperopia or astigmatism. A high number of refractive errors can lead to vision loss, and patients with astigmatism can also experience discomfort such as double vision. It is recommended that patients with abnormal refractive errors should seek medical attention in a timely manner to assess their condition and follow the doctor’s instructions for treatment.