Elderly people’s eyes may be dull and straight due to Alzheimer’s disease, cerebrovascular disease and epilepsy. 1. Alzheimer’s disease: the elderly often dazed and straight generally seen in Alzheimer’s disease patients, due to the cognitive function of Alzheimer’s disease patients, there will be personality changes, such as indifference, eyes dazed and straight, do not like to talk, but also memory loss, and in severe cases, will not recognize family members. 2. Cerebrovascular disease: Due to cerebrovascular disease, such as hypertension, diabetes, vascular sclerosis, narrowing of blood vessels and other triggers, strokes and insufficient blood supply to the brain will cause the elderly to have dull and straight eyes, slow reaction, and in severe cases, cognitive decline will also occur. 3. Epilepsy: sudden abnormal discharge of neurons in the brain can lead to transient brain dysfunction in the elderly, resulting in sudden interruption of language activities, dazed and straight eyes, and convulsions in the elderly at the onset. Elderly people should seek medical attention if their eyes are glazed over and there are other accompanying symptoms or if they are not relieved for a long period of time.