White light is comprised of different wavelengths of visible light, ranging from red (700 nm) to violet (400 nm). As white light passes through an optical system, each of its component wavelengths bends independently.
Daniel H. Chang, MD, received his BS degree in chemistry with honors from the California Institute of Technology, where his investigational career began with a summer undergraduate research fellowship. He obtained his MD degree from Duke University, where he served as a research analyst. Dr. Chang is currently chief resident in ophthalmology at Emory University and will pursue a fellowship in cornea and external disease next year. Dr. Chang's research activities have included investigations of the free electron laser and corneal transplantation.