Floaters generally appear as black, fixed, variously shaped materials floating in front of the eyes, and are more visible in bright light than in dim light. This condition is called physiological vitreous opacity. If the color turns red or brown, it should be considered as vitreous hemorrhage or retinal pathology, and a further eye examination at an ophthalmology department is recommended. This usually indicates pathological vitreous opacity, which can severely affect vision. For physiological vitreous opacities, it is important to rest, reduce close-up activities, and appropriately use some Ametin iodide eye drops. Treatment can generally lead to improvement.