Progressive blurriness in seeing should be preceded by an optometric examination. The most common disease is myopia, which is manifested as unclear seeing at a distance, and the symptoms will gradually worsen if the eye habits continue to be bad. If the visual acuity can reach 1.0 after wearing glasses, it means that the eyes are basically normal. If you cannot achieve normal vision, you should carefully investigate the cause. Common painless progressive vision loss includes cataracts and open-angle glaucoma. Cataracts have more possible causes and may be caused by age-related changes, metabolic diseases, trauma, etc. If the examination determines that the lens is cloudy and significantly affects vision while the fundus is in good condition, surgery may be considered. Open-angle glaucoma is a dangerous disease with progressive loss of visual acuity and increasingly smaller field of vision, which is not detected in time in most patients and causes irreversible changes. Anti-glaucoma drugs, such as prostaglandin derivatives, can be used early. Gradual blurring of vision in the elderly should further exclude age-related macular degeneration of the fundus, which requires fundus examination combined with OCT adjuvant examination.