Blurred vision refers to blurred vision, or dizziness due to the complexity of the content. Many disease processes can manifest with blurred vision. In young people, blurred vision may be caused by staying up all night and visual fatigue, which manifests as blurred vision and temporary myopia deepening; blurred vision with dizziness may be caused by cervical spondylosis, systemic diseases, such as anemia, hypotension, severe malnutrition, diabetes, hypoglycemic reaction, etc. It generally refers to the phenomenon of sitting for a long time, squatting and getting up with dizziness, blackness in front of the eyes and unsteadiness; blurred vision in the elderly mainly occurs due to natural aging of the body with age. It is a physiological change caused by the natural aging of the body, clinically known as presbyopia. The main reason is that the lens in the eye gradually hardens or partially hardens after aging, and the elasticity is weakened, and the contraction ability of the ciliary muscle is reduced, resulting in insufficient regulation of the sense of light, resulting in the focus of light not accurately gathered on the retina, but falls behind the retina, so that near-sighted objects or close reading words and pictures are blurred. Generally speaking, blurred eyes in young people after prolonged close work is a symptom of visual fatigue caused by spasm of the ciliary muscle regulation; dizziness with blurred eyes due to systemic diseases is often caused by sitting up or unexplained dizziness; blurred eyes in the elderly is a natural physiological change due to degeneration of the body.