If you start noticing sudden changes in your vision, it's time to see an optometrist immediately. Some troubling signs to watch out for are blurry vision, double vision, frequent flashes of light, eye pain, floaters and swelling around the eye. In addition, get checked frequently for high-blood pressure and diabetes. People with diabetes are more likely to get diabetes-related eye problems such as vision loss from eye strokes, diabetic retinopathy and macular degeneration.