During the day time when it is light outside, net curtains do provide a lot of privacy. If there is a bright florescent light bulb on inside the room, you may be able to see this on the ceiling (if it is switched on ) , this is only if you put your face right up to the glass. However the net curtains do provide a lot of privacy and you will find it very difficult to see anything inside the room. Even if you are very close to the window outside.