Small black spots in the patient’s eyes may be caused by corneal foreign bodies, vitreous clouding, diabetic retinopathy and other factors. 1. Corneal foreign body: If a foreign body, such as a small flying insect or metal debris, accidentally enters the eye and adheres to the surface of the patient’s cornea or is embedded in the cornea, it may lead to the appearance of small black spots in the field of vision when the eye is looking at something. 2. Vitreous clouding: With age, vitreous liquefaction may lead to poor stability of the vitreous body and formation of cloudy clusters, blocking the light entering the eye, which may lead to floating black dots in front of the eyes of the patient. 3. Diabetic retinopathy: If a diabetic patient’s blood sugar is not well controlled and diabetic retinopathy occurs, the patient may have black shadows in the visual field. It is recommended that patients with small black dots and other discomforts should consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.