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A colposcope is a large, electric microscope that is positioned approximately 30 cm from vagina. A bright light on the end of the colposcope makes it possible for physician to visualize cervix. It provides a maximum of information and confidence for gynecological diagnosis. Generally the simplest colposcope is a single convergent lens system, having magnifications fixed at x10-16 and is changed only by changing the eyepiece. Other colposcopes have variable magnifications, ranging from around x6-40. Low-power viewing (x6-10) allows rapid evaluation of the cervix, vagina and vulva, or complete visualization of most large lesions. Higher-power magnification (x10-6) permits visualization of more detail on the surface epithelium and vasculature, and enhances the colposcopist's ability to grade lesions. The highest-power magnification (x20-40) allows detailed analysis of vasculature, as is sometimes necessary for identification of high-grade neoplasia and early invasive lesions.