Eyes are organs that detect light, and send signals along the optic nerve to the visual and other areas of the brain [citation needed]. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system.cnidaria, molluscs, chordates, annelids and arthropods. Image-resolving eyes are present in
The simplest "eyes", such as those in unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment.
The eyes of cephalopods, fish, amphibians and snakes usually have fixed lens shapes, and focusing vision is achieved by telescoping the lens — similar to how a camera focuses.
9 comments:
pergh.. explanation dia... scientifik betol...
;p...mau x scientific..source wikipedia..panjang dia bg, kalau baca kesemuanya, mau biol 3 hari 3 malam
hehehe..xpa..jnji gmbamu mmng termantop..xmau la termantop..terbaek hehehe
gambo terbaikkk
mantap bro (nama ang sama nama pak aku hahahha...mata sebelah lg mana?)
boyzonezzz : thanx wei ;p
duke : first time visiting ka?masuk la selalu naa, blh btmbah kawan aku
azrie : thanx, bapak hg nasri, aku nazri..xserupa tp seakan serupa ;p
nice one bro..
thanx dropping by chot
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