“When we see a flash of lightning, it is because the lightning is emitting light, which might have to travel several kilometers toward us before reaching our eyes. Ancient philosophers wondered how the speed of light affected the act of seeing. If light travels at a finite speed, then it would take some time to reach us, so by the time we see the lightning it may no longer actually exist. Alternatively, if light travels infinitely fast then the light would reach our eyes instantaneously, and we would see the lightning strike as it’s happening. Deciding which scenario was correct seemed beyond the wit of the ancients.” (Sing, Simon. Big Bang. The Origin of the Universe. New York: Harper Collins, 2004:87)

Numerous studies have evaluated the ability of confocal scanning laser ophthalmoscopy to discriminate between healthy optic nerves and those with established glaucoma. In a prospective study the Confocal Scanning Laser Ophthalmoscopy Ancillary Study Group documented that several baseline topographic optic measurements alone or combined with baseline clinical and …