Visual field defect is a manifestation of many diseases in ophthalmology can cause, timely detection of visual field defect, for early diagnosis of glaucoma and other diseases have an important role. There are two main methods of self-testing visual field defects: 1, a single person for self-testing, facing a white wall, cover the left eye with the palm of the left hand, open the right eye, look straight ahead, observe the entire wall, feel whether there is a clear sense of obscuration in front of the eyes, if there is a visual field defect, and then the same method and then test the left eye. 2, two people with self-testing, two people 1m away from each other, standing face to face, the detector with The right palm to cover the right eye, the test person with the left palm to cover the left eye, the test person with the right eye to stare at the test person’s left eye, then the test person with the left hand index finger from the upper, lower, left and right four directions from the field of vision outside to move slowly inward, when the test person sees the index finger reported to the test person, observe whether the two can see the finger in the field of vision at the same time, if the test person and the test person found the finger position difference is relatively large. It is likely that there is a visual field defect.