Evolution of the Eye

Hello:

Contrary to Creationist claims, scientists have a pretty good idea how our eyes evolved.

See:
http://en.wikipedia.org/wiki/Evolution_of_the_eye
http://www.pbs.org/wgbh/evolution/library/01/1/l_011_01.html
http://www.scienceagogo.com/news/20050822230316data_trunc_sys.shtml
http://www.teachersdomain.org/resource/tdc02.sci.life.evo.nilssoneye/

TalkOrigins raises an interesting point:

intermediate stages through which eyes might have evolved via gradual steps (Darwin 1872).

* photosensitive cell
* aggregates of pigment cells without a nerve
* an optic nerve surrounded by pigment cells and covered by translucent skin
* pigment cells forming a small depression
* pigment cells forming a deeper depression
* the skin over the depression taking a lens shape
* muscles allowing the lens to adjust


All of these steps are known to be viable because all exist in animals living today. The increments between these steps are slight and may be broken down into even smaller increments.

Read more:
http://www.talkorigins.org/indexcc/CB/CB301.html