Transparency overlay. A rapid method to assess retinal pathologic changes.

Many ocular disorders are managed with the aid of serial photography to detect, document, and measure change. The authors developed a method of field mapping that is a clinically useful, rapid, and inexpensive way to assess changes in retinal anatomy using recently released Polaroid 691 transparency film. This transparency film allows the pretreatment fluorescein angiogram and the posttreatment black-and-white or color transparency images to be enlarged and compared without the use of additional photographic enlargers or projectors.