Patients with punctate intraocular chorioretinopathy mainly complain of dark shadows in front of one eye, flashing sensation, dark spots, blurred vision and loss of vision. Easily confused with the symptoms of monocular black shadow in front of the eyes? 1, abnormal flash in front of the eyes, increased dark spots Pathological mosquitoes are generally caused by serious diseases, is due to the vitreous body near the retina, optic nerve, ciliary body and other structures of the lesion and lead to vitreous changes. 2, see things with small black dots See in the flying mosquitoes (Floaters). Patients will appear in front of the eye black dots, and will fly around with the rotation of the eye, as if flying mosquitoes, its shape has a round, oval, dotted, linear, etc.. Commonly, when the patient is looking at the blue sky, white walls and other brighter backgrounds, it is easier to find its presence. 3. Sudden onset of transient black blindness in one eye Some elderly people sometimes inexplicably experience sudden blindness in one eye, which gets better again after a minute or a few minutes, and some of them also have several recurrences. Some of them also experience hemianesthesia, sudden limb immobility, or even hemiparesis a few days or months after the above occurs. The above symptoms are also known as monocular transient blackout in medical terms, which refers to the sudden, transient loss of vision in one eye. 4.Black clouding is a clinical symptom that the eye cannot see or see clearly when it sees objects, and it is manifested by blackness in front of the eyes. It mostly appears clinically in the form of transient blackout, often due to transient cerebral ischemia, anemia, hypotension, etc., and should be noted.