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Sat, Mar 28, 2009

ANN's Daily Aero-Term (03.28.09): Dark Adaptation

Aero-Terms!

Aero-Terms are designed to be a daily reminder of the terms, names, acronyms and explanations of the unique language that populates the aviation world. Aerospace, sport aviation, fixed wing, helo, you name it... it's all fair game.

Aero-Terms should serve as a quick but intriguing reminder of the terms you may use every day, or an introduction to an aspects of the Aero-World you may not yet be familiar with. ANN also encourages readers to go beyond the FMI link, and further research any intriguing terms.

Suggestions for future Aero-Terms are ALWAYS welcome, as are additions or discussion of the explanations given for each Aero-Term.

Dark Adaptation

Dark adaptation consists of the physical and chemical changes in your eyes that allow them to see well in the dark. Physically, the pupils of the eyes open wider (this happens quickly); chemically, slower changes occur in the eyes (which takes 10-20 minutes). It takes about 20 minutes for your eyes to completely adapt to darkness. Once your eyes become accustomed to the dark, even a momentary flash of white light can ruin it and your eyes will have to adapt all over again.

FMI: http://webvision.med.utah.edu/light_dark.html

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