It is not comprehensive enough to say that visual field examination is not included in the routine examination and physical examination content. Central vision is a function within 3 degrees of the center of the visual field, and the visual field is a near-elliptical surface in the range of 60 – 100 degrees around the point of gaze, containing the overall information of the eye and visual conduction pathways. The onset of chronic simple glaucoma begins with peripheral vision loss, which is not easily detectable in the early stages and cannot be restored in the middle to late stages of blindness. The patient’s left or right eye develops sequentially in time, and because the visual fields of both eyes overlap, the better eye masks the reduced visual function of the other eye, which is irreversible by the time it is detected. If the state of the visual field is noted and often remains unchanged, then early attention can preserve residual visual function. All types of glaucoma are changes at the end of cerebral blood vessels and at the edges of brain tissue. After aging, open-angle glaucoma can be transformed into closed-angle glaucoma and blindness, both with high intraocular pressure and with normal or low intraocular pressure. In primary glaucoma, open-angle glaucoma begins with an enlarged optic papilla trap, closed-angle glaucoma begins with a shallowing of the anterior chamber, and malignant glaucoma begins with measurement of IOP. Closed-angle glaucoma is ischemia of the anterior segment of the eye with embolus formation or thrombus dislodgement, chronic glaucoma or acute closed-angle glaucoma in the chronic phase has an enlarged optic papilla trap, which is a volume reduction of the optic nerve, a glaucoma-type optic nerve atrophy, a cerebral ischemia of the retinal ganglion cell fibers going from the retinal fiber layer to the lateral geniculate body of the brainstem, and apoptosis of the nerve cells; malignant glaucoma is based on the change of IOP treatment and there is an intraocular pressure stress response. The principle of glaucoma filtration surgery is intraocular dehydration, so that the eye becomes an open system of microcirculatory pressure, successful surgery has the energy loss of intraocular microcirculatory pressure, before and after surgery is a process that does not improve vision, trabecular histopathological examination reports are normal cells, surgery can prevent the possible rupture of the eye after the absolute stage of glaucoma, after surgery still need to pay attention to cerebral thrombosis and emboli dislodgement. The small volume of the farsighted eye is associated with closed-angle glaucoma, and the increased volume of the axial myopic eye with thinning of the eye wall is associated with open-angle glaucoma or/and retinal detachment. The cause of visual impairment can be due to vascular obstruction, but also can be due to systemic vasodilators, especially venodilators, blood theft, when the fundus examination feels that the arterial blood vessels become thin is actually the subjective perception of the examiner, because of the lack of reference around the difference of small points, it is not possible to say whether the artery is thin or thick veins, if there is no tissue damage does not mean that the artery is thin, if the vein is thick then the treatment with venodilators is not If there is ischemic tissue damage, then it only means that the blood vessels at the ischemic site are fine, not that the blood vessels around the ischemic tissue are fine. Color vision should also be discussed in the visual field, and the visual field also distinguishes between the light field and the color field. The color field narrows centripetally than the light field, and the localization of its shape has the same meaning as that of the light field. When color blind people cannot understand why they cannot distinguish between colors of different brightnesses in the hospital, they are often afraid of social discrimination and have conflicts with the hospital doctors. This requires an effective explanation from the doctor, as there are both congenital and acquired color blindness. The objective examination of the visual field is time-consuming, because the patient’s eye lacks fixation, and in the early stages of visual field defects, the patient often encounters a small dark spot during the examination, and the eye follows the action of the eye, so that the functional area of the patient’s visual field covers the non-functional dark area, so it is difficult to detect in the early stages, and I believe that this is why simple glaucoma can appear, because it is difficult to detect, so it cannot adjust itself at any time For nutrition in case of reduced visual function, self-testing of the visual field can be done on a continuous basis in time.