There are small black dots in the eyes, mainly due to the following reasons: 1, due to flying mosquitoes, common in middle-aged and elderly people over 40 years old, and more than 600 degrees of high myopia patients, is caused by the degeneration of the vitreous tissue inside the eye, the original transparent vitreous because of degeneration, the formation of flocculent turbidity, will project shadows onto the retina, resulting in small black dots, which are characterized by 2. caused by retinal hemorrhage, which is common in patients with hypertension and diabetes, the hemorrhage is located in front of the retina, blocking the light from reaching the retina, so it appears as a small black dot in front of the eyes, usually in a fixed position, and does not appear to float. 3. caused by macular damage, such as being irradiated by a laser pointer, the small black dot is usually located in the very center of the visual field, and is accompanied by vision loss.