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Questions have arisen about when to use translucent occlusion of a spectacle lens. 1. If you can't control diplopia with prisms and it continues to be annoying, and if it is truly double vision and not just blurred vision in each eye alone, covering either eye will resolve the problem. This is instead of a prism or when a prism stops working. 2. I find patients are more comfortable with putting translucent tape over one eye than wearing a patch. Micropore surgical tape 2 inches wide is ideal, or wide scotch tape carefully applied so there is no annoying seam. Cover the entirety of the lens where the problem is, i.e., if you only have double vision at near [reading], just tape the reading glasses or the small bifocal segment used to read [that is, if you insist upon bifocals.] 3. In most patients, even left handed patients, the right eye is preferred to fixation. Therefore, in giving general advise to a large group, I say to cover the inside of the left spectacle lens -- I really mean the lens of the non-dominant eye. Jacquie Winterkorn, MD