This part of the study is based on the hypothesis that cataracts affect sensory input, which can degrade the brain. The study included 3,038 participants over 65, initially without dementia, diagnosed with cataracts or glaucoma. Of these participants, 853 developed dementia, with 709 of them developing Alzheimer’s disease. Those who underwent cataract surgery had a 30% lower risk of developing dementia for at least the next 10 years after surgery, and the reduction in risk was characteristic of Alzheimer’s disease.
At the same time, the operation to remove glaucoma did not affect the development of dementia in any way, did not reduce the risk.