A new study draws a link between vision impairment and dementia.  A new study from Johns Hopkins University School of Public Health concludes nearly 1 in 5 demential cases could be associated with some form of vision impairment. The most well-known form of dementia is Alzheimers disease but the CDC notes dementia refers to a wide range of impairments to one’s ability to recall, think, or make decisions. The new study offers hope that better eye health could be one way to lower the diagnosis rate.