Timed for the biggest gathering of screens — desktop, laptop, tablet, TV, phone — on the planet, a new survey finds 70 percent of users of those screens report some level of eye discomfort dubbed “digital eye strain.” Symptoms included dry eyes, blurry vision, fatigue and neck and shoulder cramping. The survey released Thursday by the Vision Council, a trade group for makers of eye care products, warned of serious long-term eye risk, including macular degeneration and cataracts. Here, readers might pause to blink...