“There have been numerous studies reporting the association between visual impairment and dementia,” explained the authors.
“Given the consistent evidence on associations between visual impairment and neurodegenerative diseases, we could reasonably speculate a neurodegenerative process occurs in the eye as it does in the brain which could explain the association.”
The authors noted that macular thickness and volume was prevalent in patients with Parkinson’s disease.
“The ‘top-down theory’ might explain visual impairment observed in Parkinson’s Disease,” they explained.