Hi Helen,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Double vision and dryness can be caused by the high blood sugar level or diabetes.
High blood pressure can cause double vision as well.
Stroke in the brain is another possibility for double vision.
Isolated eye muscle palsy can be another factor.
You should see your doctor soon for further evaluation.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/