Properties of light: length: hue (or colour, amplitude: brightness, purity: saturation (richness) Different wavelengths of light is our experiences of color- hue=wavelenghts. Blue- 2100 nanometers: anatomy of the eye, cornea: covers iris & pupil protecting it from dust, etc. Cornea- does most of refractive work (can tear with contacts). Zf- pull on the lens, make it focus. Ah-- watery, ch- more gelly, thin layer of cell at back of cells. Fovea contains only cons- high visual acuity, see things in great detail. Where your looking: anatomy of the eye http://www. google. ca/imgres?imgurl=http://pavtechnologies. com/pavwordpress/wp-content/uploads/2009/02/human-eye-2. jpg&imgrefurl=http://pavtechnologies. com/pavwordpress/%3fcat%3d16&usg=__vkzeyc0stgwnx_-7ih2zlenw638=&h=265&w=315&sz=38&hl=en&start=19&zoom=1&tbnid=ucbbnwf2usullm:&tbnh=161&tbnw=191&ei=5fbqte6tcczbiakcnix_&prev=/search%3fq%3dhuman%2beye%26um%3d1%26hl%3den%26client%3dsafari%26sa%3dn%26rls%3den%26biw%3d1172%26bih%3d517%26tbm%3disch&um=1&itbs=1&iact=hc&vpx=888&vpy=135&dur=3007&hovh=206&hovw=245&tx=144&ty=115&page=3&ndsp=9&ved=1t:429,r:4,s:19&biw=1172&bih=517. Know the anatomy: anatomy of the eye. 9: anatomy of the eye, vitreal floaters: debris too large for phagocytic consumption. How far we can see depends on how far light travels. You can see as far as light can touch your cons- no limit: the retina. Rods/cons- photo receptors, last layer that light detects. Light comes in r l, dectected by rods/cons, then signal.