The symptoms of a secondary retinal detachment are actually not much different from the first detachment; it's like a fixed shadow. Therefore, if you have ever experienced retinal detachment, you can cover one eye and use the other eye to check the visible range. Remember what range you can see now and then pay attention to any changes in the future. This way, you can clearly understand the changes in your field of vision. In the early stages, there may be an increased sensation of flashing lights or some floating dark shadows, so if these symptoms appear, it is important to go to the hospital for an examination.