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Can you get brain fog from not wearing your glasses or from delaying cataract surgery? 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 older age, lower education level, gender and occupation, the researchers found that those with undercorrection of their eyesight and non-wearing of their glasses had a significantly lower cognitive function score than others.

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