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Eye Disease, Cognitive Decline Linked in Study
Date:5/12/2009

Research indicates that dementia and age-related macular degeneration may have a common cause

TUESDAY, May 12 (HealthDay News) -- Seniors who perform poorly on tests of language, memory and concentration are more likely to be suffering from the early stages of age-related macular degeneration, a major cause of vision loss, a new study suggests.

The finding stems from a look at the association between cognitive function decline and the onset of age-related macular degeneration (AMD) among approximately 2,000 Australian seniors between the ages of 69 and 97.

"We found that those who have memory impairment were more likely to have early stages of macular degeneration independent of the effects of age, education and vascular risk factors," said study co-author Dr. Tien Yin Wong, a professor in the department of ophthalmology within the Centre for Eye Research Australia at the University of Melbourne.

Wong and his colleagues published the findings in the May issue of the Archives of Ophthalmology.

Age-related macular degeneration is the leading cause of vision loss among the elderly. The researchers note that prior research has suggested that Alzheimer's disease and AMD share similar developmental pathways in terms of protein build-up and brain and eye changes.

The authors' current observations are drawn from an analysis of retinal photographs taken of study participants (more than 80 percent white and all enrolled in a larger cardiovascular health study), from which a diagnosis of early-stage AMD was made.

Those diagnoses were lined up against results of cognitive function and neuropsychological tests designed to assess each subject's abilities in terms of concentration, language, memory and orientation skills. Most were also tested for dementia and cardiovascular risk factors.

The researchers determined that nearly 16 percent of the participants had early AMD, while 135 a
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