An eye condition could leave you blind if left untreated. And a doctor is warning that it develops slowly - so you may not notice until serious damage has happened. Now people are being urged to look out for strange visual clues around lights. In addition, while the condition can be serious, there are things you can do protect your eyes. Today marks World Glaucoma Day (March 12) and experts are encouraging individuals to prioritise their health, especially their eyes. Known as the "silent thief