floaters; myodesopsia
Medical term for seeing spots or thread-like shapes drifting in the field of vision. Often used in ophthalmology contexts.
As a symptom of floaters, you may see small black dots floating in your field of vision.
I was diagnosed with floaters at the eye clinic.
Composed of 飛 (fly), 蚊 (mosquito), and 症 (symptom/condition), referring to the mosquito-like shapes that appear to fly across the vision.