MANNHEIM, Germany, August 2012 — Can you get brain fog from not wearing your glasses? A study of elderly Chinese suggests that not seeing clearly can lead to lower cognitive function levels.

Cognitive function is the ability to perceive, understand and remember ideas. A low cognitive function score can mean a reduced ability to make good decisions and live independently.

Cognitive function was calculated in 3,127 participants of the Beijing Eye Study, all of whom had received eye and medical examinations.

After adjusting for factors such as age, education level, gender and occupation, the researchers found that participants whose vision problems were not fully corrected or who failed to wear their glasses had a significantly lower cognitive function score than others.

A study report was published online this month in Acta Ophthalmologica.