Disclosed is a method for obtaining feedback to drive a servo system for aligning and maintaining alignment in optical systems that bring light to an in vivo skin sample, for adjusting the focus of the optical system, and for adjusting the net depth of focus of the optical system within the in vivo system...http://www.google.ca/patents/US20020091322?utm_source=gb-gplus-sharePatent US20020091322 - Method and apparatus for noninvasive assessment of skin condition and diagnosis of skin abnormalities
