If you have double vision, your treatment will depend on whether you have double vision in one eye (monocular) or both eyes (binocular), and the underlying cause. Underlying conditions may be treated separately. Read more about the causes of double vision.
curtain. n. 1. a piece of material that can be drawn across an opening or window, to shut out light or to provide privacy. 2. a barrier to vision, access, or communication: a curtain of secrecy. 3. (Theatre) a hanging cloth or similar barrier for concealing all or part of a theatre stage from the audience.
Best Answer: Curtains are designated by their insulating capability and by how well you can see through them. Semi sheer would be like a slip that you can not see through but is not at all thick. It would offer little insulation. Think of a drape that would block sunlight. One that is thick enough to block light will block heat loss.