The eardrum is visible to the naked eye. The eardrum is deep in the external auditory canal and needs to be illuminated by a light source to be able to see it. The eardrum is the outermost part of the middle ear and divides the outer ear from the middle ear. In adults, the external auditory canal is generally about 2.5-3.5cm long, there are two narrowing of the external auditory canal, and the external auditory canal is in the shape of S. Therefore, when checking the condition of the eardrum, it is necessary to pull the auricle backward and upward gently, and straighten the external auditory canal, and then the eardrum is able to be seen. Some special cases such as the external auditory canal is particularly narrow, the eardrum can not be seen well, you need to use the otoscope to enlarge the external auditory canal, or there is cerumen in the external auditory canal blocking the vision, you can not see the eardrum, you need to clean the external auditory canal. The best way to examine the eardrum now is with an otoscope, where the eardrum is magnified under a monitor and the structure of the eardrum can be seen very clearly.