I am seeing a overlapping letters or double images of a same stuff in a slightly faded manner. This predominantly occurs when the background is dark and letters are white and that could be in phone or a book with dark background . I have -.5 cylindrical power in left eye and my right eye is 6/6 . I consulted my doc and she said retina is fine . What to do this happened suddenly and is existent is since last 10 days . I also tried to stop using phone and laptop to reduce strain but nothings working .