Age-related changes in vision and cognitive performance: Are there cognitive benefits from cataract surgery?

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It is possible that some of the confusion and memory loss experienced by older people is due to perceptual errors resulting from poor vision. If this is the case, then treating visual impairment may improve everyday cognitive functioning in some older people. This study aims to find out if the improvement in vision experienced after cataract surgery leads to improvement in memory and cognitive processing among older persons. The study will follow a group of adults aged 70 and older who are about to undergo cataract surgery and test them on measures of cognitive performance before surgery, and 3 and 12 months after surgery. Another group of older adults with cataracts who have not yet had surgery and a non-cataract group will also be studied over the 12 month period. The hypothesis of the study is that the group who have had cataract surgery will show greater improvement on the measures of memory and cognitive processing over the follow-up period than the other two groups. The design of the study will allow us to determine whether improvement is due to either; a) simply being able to see the tests better, b) improvement in mood and social participation as a result of cataract surgery; c) changes in the brain that occur from increased sensory stimulation; or d) a combination of these factors.