Watch video above to see these stories on AZ Illustrated Science on Tuesday, Oct. 21:

COLOR VISION: Michael McNulty is a landscape photographer writing a book on vision and light. He explains the particulars of how people's eyes perceive different colors and wavelengths of light, as the colors shift with the rising sun.

PHOTONICS: Photonics - a kind of specialty light- is used in everything from dental and medical surgery, telecommunications, building automobiles and phones, and even dismantling a nuclear power plant from a safe distance away. U.S. has been a leader in optics and photonics research. However, countries such as China and Germany are becoming bigger competitors.

VISION TESTING IN SPACE: Local researchers have patented a new system for testing astronauts' vision in space.

EMDR: Eye movement desensitization and reprocessing is a psychotherapy treatment designed to distress associated with traumatic memories. Researchers say it facilitates the accessing and processing of traumatic memories to bring these to an adaptive solution.

AZ Illustrated Science is produced by Georgia Davis. Contact her at gdavis@azpm.org.