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Vision - • myopic(near-sighted image focused in front of...

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Vision eye - begins w/ capture of light energy by photoreceptors eyespot - predecessor to the eye o cluster of photoreceptors o sensitive to light, but cannot form images sclera - white of the eye, made of connective tissue light enters eye through transparent cornea iris - colored portion of eye o can decrease size of pupil (opening) lens focuses image onto the retina on the back of the eye light has to pass layer of bipolar cells and ganglion to reach rods/cones rods - photoreceptor for black/white vision o rhodopsin - photopigment in rods cones - photoreceptor for color vision o found mostly in fovea (central region of retina) o photopsin - photopigment in cones o 3 different cones >> 3 color sensitivities (blue, green, red) dark >> photoreceptors release neurotransmitter that inhibits bipolar neurons >> less action potential goes to brain occipital lobe of brain interprets messages from the eye o blind spot - where nerves come out of the eye, leading to the brain
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Unformatted text preview: • myopic (near-sighted) - image focused in front of fovea • hyperopic (far-sighted) - image focused behind fovea • color blindness- sex-linked trait o due to lack of certain type of cones o trichromats - people w/ normal color vision • binocular vision- ability to see 3D images and sense depth o due to 2 eyes viewing object from different angles o less binocular vision >> larger overall field of view other sensory experiences- other parts of electromagnetic spectrum used to sense environment • heat- wavelengths longer than visible light o poor environmental stimulus in water o pit viper - only vertebrate known to sense infrared radiation • electricity- good environmental stimulus in water o all aquatic animals general electrical currents from muscle mov’t • magnetism- eels, sharks, bees, birds navigate according to earth’s magnetic lines o used in migration...
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