Eye - online puzzles

Eyes are organs of the visual system. They provide organisms with vision, the ability to receive and process visual detail, as well as enabling several photo response functions that are independent of vision. Eyes detect light and convert it into electro-chemical impulses in neurons. In higher organisms, the eye is a complex optical system which collects light from the surrounding environment, regulates its intensity through a diaphragm, focuses it through an adjustable assembly of lenses to form an image, converts this image into a set of electrical signals, and transmits these signals to the brain through complex neural pathways that connect the eye via the optic nerve to the visual cortex and other areas of the brain. Eyes with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image -resolving eyes are present in molluscs, chordates and arthropods.

The simplest " eyes ", such as those in microorganisms, 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 and to the pretectal area to control the pupillary light reflex.

Blue online puzzletiger - big cat online puzzleGabrysia Pietrucha-beauty online puzzleAnime Neko Girl jigsaw puzzle onlineDISNEY FROZEN 2 jigsaw puzzle onlineGolden Trio jigsaw puzzle onlineThe Gioconda jigsaw puzzle onlineCat Puzzle online puzzleCute Cartoon Pink Kittens Unicorns jigsaw puzzle onlineTwo gray cats jigsaw puzzle onlineCute kitten jigsaw puzzle onlineBaby kitten jigsaw puzzle onlineRed light, green light jigsaw puzzle onlineSun conure parrots jigsaw puzzle onlinebeautiful cat jigsaw puzzle onlineMale reproductive system online puzzleDju's cat jigsaw puzzle onlinepark rose jigsaw puzzle onlinecat's doll jigsaw puzzle onlineElsa ice jigsaw puzzle onlineMom with a little daughter jigsaw puzzle onlineKima Sofia Pantoja Loaiza jigsaw puzzle onlineKim Tae Hyung online puzzleMy cat online puzzle
Parrot in nightsafari chiangmai Thailand jigsaw puzzle onlinequeen of the dessert online puzzleCat in tree. online puzzlelisa blackpink jigsaw puzzle onlineElsa Bajka online puzzleGeorgie Porgie jigsaw puzzle onlineKoala bear online puzzleAriana Grande jigsaw puzzle onlineBorrego's liannet online puzzlepark rose jigsaw puzzle onlinebaby yoda !!! jigsaw puzzle onlineJungkook jigsaw puzzle onlineSleeping Beauty online puzzlekitten on basket close up online puzzleSmall lion jigsaw puzzle onlineTwo parrots red in tropical forest birds jigsaw puzzle onlineExotic colorful African macaw parrot, beautiful close up on bird face over natural green background, bird watching safari, South Africa wildlife jigsaw puzzle onlinesuper jennie jigsaw puzzle online3D kitten online puzzleMy beloved favorite online puzzletfgyu8uyhyu78 online puzzleAnime crying girl jigsaw puzzle onlineKokichi Ouma lie dying online puzzleCuba cat jigsaw puzzle online