The eye always sees watery shadows, usually due to conjunctivitis or vitreous clouding. When a patient has conjunctivitis, it can lead to the formation of secretions in the conjunctival sac, which may cover the surface of the cornea with the flushing of tears and movement of the eyelids, thus causing the patient to look at things as if there were watery shadows present. The aging factor leads to vitreous clouding, because the patient’s originally transparent vitreous tissue inside the formation of flocculent translucent turbidity, light refraction will be blocked by turbidity, casting a shadow on the retina, resulting in the patient’s field of vision has a watery black shadow floating. It is recommended that patients with dark shadows in front of their eyes should consult a hospital in time to assess their condition and follow the doctor’s instructions for treatment.