It is well known that the earlier any disease is detected, the easier it is to treat and the less damage it will cause. Macular diseases, including macular degeneration, macular scarring, macular hemorrhage, macular fissure and macular edema, are the culprits that directly damage vision, cause blindness and affect our normal life, early detection is crucial. Do we have to go to the hospital to detect macular degeneration? No, at home, we can check it ourselves. An Amsler chart, or a piece of field grid paper used by elementary school students, is an effective tool for self-examination. We block a glance, stare at the black spot in the center with one eye (usually 30 cm from the paper), and observe whether the surrounding squares are the same size, whether there are any distorted lines, and whether there are any black shadows to obscure them. Those who usually wear glasses need to wear glasses to check, and those who have presbyopia, wear presbyopic glasses to check. After checking one eye, check the other eye. If there are black shadows, squares of different sizes, or distorted lines, it means that there is a problem with the macula, and you must go to the ophthalmology department immediately. In addition, during our treatment follow-up, applying this table, we can also check ourselves for any changes in the condition. We first shade a glance, stare at the center point with one glance, and draw the distorted or shaded part. After treatment, we can always repeat to draw this distorted area or shaded area again, and judge whether there is any change of the condition according to the change of the size of the range drawn twice. A small piece of paper and a pen help us to detect macular degeneration at an early stage.