  Due to the highly inhomogeneous distributions of refractive indexes, light
propagation in complex media such as biological tissue experiences multiple
light scattering events. The suppression and control of multiple light
scattering events are investigated because they offer the possibility of
optical focusing and imaging through biological tissues, and they may open new
avenues for diagnosis and treatment of several human diseases. In order to
provide insight into how new optical techniques can address the issues of
multiple light scattering in biomedical applications, the recent progress in
optical wavefront-shaping techniques is summarized.
