How does eyeball have a black dot to return a responsibility

There are many factors that need to be considered when there are black spots in the eyeball. The first one may be caused by vitreous opacity. The second one may be related to factors such as fundus hemorrhage, trauma, burns, etc. The third one does not rule out floaters, or cataracts. It is recommended that patients go to ophthalmology to see, so as to make a clear diagnosis.