UMass Amherst KIN 460 - 09-Vsiual system- Eye - photoreceptors - visual processing (69 pages)

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09-Vsiual system- Eye - photoreceptors - visual processing



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09-Vsiual system- Eye - photoreceptors - visual processing

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Pages:
69
School:
University of Massachusetts Amherst
Course:
Kin 460 - Motor Control

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Somatosensory system Review What would it be like to lose proprioception but have a normal efferent system Ian Waterman Pride and a Daily Marathon Cole 1995 At age 19 got flu his immune system attacked nerves for touch and proprioception Initially did not move he says he could move but his lack of control made it dangerous and ineffective Taught himself how to walk to drive to hold an office job All his movements done under conscious control and continuous visual inspection Without thought there was no movement https www youtube com watch v pMEROPOK6v8 Visual system Visual perception of biological motion https www biomotionlab ca analysisand synthesis of biological motionpatterns http www biomotionlab ca Anatomy of the human eye Animation Eye diseases Glaucoma Aqueous humor fluid is replaced 12x daily in healthy eye Reduced drainage intraocular pressure blood supply damage to retina Eye diseases Cataracts Lens become opaque caused by aging and UV solar radiation Accounts for half of all blindness cases Monocular deprivation binocular vision Overview How are images formed by the eye optics What is the nature and function of retinal neuronal cells The blind spot in your eye How do we perceive color and contrast How does the brain process vision Cornea and lens refraction of light to form a focused image on the photreceptors of the retina Cornea contributes most of the refraction Lens adjustable refraction accomodation Accommodation dynamic changes in the refractive power of the lens Large distance flat lens least refraction unaccomodated Short distance round lens most refraction accomodated Accommodation Amplitude of accomodation decreases with age Refraction Refraction Opticians describe the power of refractive surfaces by the reciprocal of their focal length in metres and these units are called dioptres D for a convex lens the power is positive left for a concave lens the power is negative right Normal refraction Refractive errors Myopia nearsighted If refractive



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