Optical coherence tomography (OCT) is a life-time method for biological tissues structure imaging. The method is referred to as “optical biopsy” owing to high image resolution (20-25 micron) and being an alternative to traditional excisional biopsy when the latter is not possible or undesirable in cases when no cell identification is required. It is best used for investing tissues study. The technique is ideal for studies of investing tissues. The method is registered to be used in Russia (For life-time examination of skin morphology in health and disease by the optical coherence tomography method: Novel medical technology, 2008).