Computerized optometry, as the first step in the whole optometry process, is mainly a reference for subjective optometry, and in most cases is not very accurate. As a method of objective optometry, computerized optometry is mainly based on optical principles to make measurements, which are mostly used as reference data for subsequent subjective optometry. Since optometry emphasizes on comfort, clarity and durability of the eyes after wearing the lenses, the data from computerized optometry may not be suitable, and it is necessary to carry out procedures such as trying on the lenses after subjective optometry, which may adjust the data from computerized optometry or the axiality of astigmatism before the final results of the optometry can be determined. In some specific cases, such as corneal damage, the computerized optometry may not be able to obtain the optometric data, and the computerized optometry may not be able to obtain the corrected visual acuity to make a judgment on amblyopia and other conditions.