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Chapter 2

Chapter 2 - study notes

8 Pages

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Matthias Niemeier

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CHAPTER 2 THE FIRST STEPS IN VISION: SEEING STARS A LITTLE LIGHT PHYSICS -light is form of electromagnetic radiation energy produced by vibrations of electrically charged material, 2 types of light: waves=fluctuation that travels through a medium by transferring energy from one particle or pt to another wo causing any permanent displacement of medium ; photons = quantum of visible light or other form of electromagnetic radiation demonstrating both particles and wave properties. Light made up of waves when it moves around and made up of photons when it is absorbed -full spectrum of electromagnetic radiation is very wide, visible light only small portion of spectrum, from 400-700nm, violet to red -light can be absorbed = to take up, refracted = to alter as water does to light entering it from the air, to measure degree of refraction in a lense or eye, reflected = to redirect, scattered = to disperse, transmitted = to convey smt from one place to another EYES THAT SEE LIGHT -light hits cornea (1), it is transparent thus most light photons are transmitted rather than reflected or absorbed, transparent cuz made of no blood vessels which absorbs light, arrangement of fibers, high transparent sensory nerve endings, which forces eyes to close and produce tears if cornea is scratched, preserving itz transparency -aqueous humor (2) = fluid derived from blood, fills space right behind cornea, supplying oxygen and nutrients to and removing waste from cornea and crystalline lens. -(3)pupil = controls amount of light that reaches retina via papillary light reflex, iris -when coming from dark room to bright, pupil constricts and photic sneeze reflex results from crossed wires in brain - (4)crystalline lens. Lense like cornea has no blood supply so transparent, it enables changing focus shape of lense controlled by ciliary muscle th -(5) vitreous humor = light is refracted for the 4 and final time, only not refracted in pupil, longest part of hte journey through eyeball, 80% of internal volume of eye, gel-like, transparent -floaters = small bits of biodebris that drift around in vitreous -(6) retina = only a bit o f light reach here. Half reaches corner, role of retina is to detect light and tell brain about aspects of light that area related to objects in world. Retina is www.notesolution.com
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