Visual acuity examination: including bare eye vision and best corrected visual acuity with glasses. Refractive examination: including dilated optometry and comprehensive optometry. The correctness of optometry directly affects the effect of surgery. Anterior segment and fundus examination: focus on corneal transparency, whether the cornea is scarred, whether the crystal is cloudy, whether there is vitreous turbidity, fundus lesions, etc. Intraocular pressure examination: to rule out the possibility of high intraocular pressure and glaucoma. Monitor the change of IOP before and after surgery to prevent postoperative hormonal high IOP causing eye damage. Corneal thickness measurement: Corneal thickness has a decisive role in the selection of surgery and the design of the size of the cut, etc. The measurement of corneal thickness will enable the surgery to obtain more accurate predicted results. Corneal topography examination: The main purpose is to have an understanding of the regularity and symmetry of the entire corneal surface and to exclude various abnormalities. Wavefront aberration examination: To check whether the eye has higher order aberrations that seriously affect the quality of vision in addition to lower order aberrations such as myopia, hyperopia and astigmatism, and to collect higher order aberration data as a basis for diagnosis and surgery, and to determine individual cutting plans according to different individuals.