Blurry eyes of 70-year-olds may be caused by cataracts, presbyopia and glaucoma. 1. Cataract: Usually due to ageing, it leads to degenerative lesions of the lens, which causes blurred eyes in 70-year-olds. 2. Presbyopia: As we age, the lens of the eye hardens, leading to a decrease in accommodation. This can produce blurred eyes when looking near and far. 3. Glaucoma: If an elderly person suffers from glaucoma, it will compress the optic nerve at the bottom of the eye, resulting in optic nerve damage, visual field defects and other manifestations, which may result in the symptoms of blurred eyes. The 70-year-old should go to the hospital for examination and standardized treatment according to the cause of the blurred eyes. Don’t watch TV or read books for a long time and pay attention to eye rest.