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Lecture 9

Exceptional Children: Developmental Disorders - Lecture 9

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Psychology 2043A/B
Esther Goldberg

Psychology 2043AExceptional Children Developmental Disorders thLecture 9Monday November 28 2011 Visual Impairments As hearing and vision develop motor skills are able to develop Hearing and vision work together FINAL EXAM can still submit questions accept them up until 24 hours after next weeks class exam will be the same as the first one 11 units of study instead of 101The eye o Know the basic o There are 3 main parts to the eyeThe outer layer 2 different parts y Sclera o Covers the entire eye o Its the outside of your eye o Toughest outermost areao Maintains the shape of your eye holds everything in y Cornea o Is the spot on your eye that deflects or bends the light that comes into it o All light that enters your eye comes through your corneaMiddle layer y Iris o Coloured part of eye o The colour of your iris is determined by the connective tissue and the pigment cellsIf you have a lot of pigment you have browner eyes Less pigmentlighter or more blue o Adjustable piece of eye o Surrounds pupil o Can shrink and growHas 2 muscles that do thaty Muscle that makes iris smallery When iris gets smaller pupil gets bigger lets more light into eye y Muscle that makes iris bigger y Vice versa check in texty Lens o Deflector o Clear part of eye o Helps focus light onto the back of your retina o It bends light o Changes its shape to accommodate light from objects of different distancesChanges its shape to help focus light onto retinaInnermost layer y Retina o At the back of your eye o Its curved or concave o The most sensitive site on retina is your foveaFovea is where you have rods and cone cellsYour rods are responsible for vision in low lightYour cones are responsible for colour vision and detail o Its the place where light hits when it comes in the lens of your eye o There are chemicals in retina that takes the light that comes into your eye and converts it to electrical impulses those are what your brain interprets as vision o The nerve fibres of retina collect at back of eye and form the optic nerveWhich is how the electrical impulses travel to brain o The spot where the optic nerve leaves your retina is your blind spot where there are no rods or conesYou arent aware that you have this blind spot because your other eye covers for it 2Normal VisionAcuity o Chartreferred to as a Smellen ChartWhen we talk about vision acuity y Its referred to as Smellen AcuityHerman Smellan made this testVisual acuity y Measure of how well you can see y How clearly you see y Acuity means sharpness in latin y Eye chart is set to a certain size and you want to stand 20 feet away from it to judge how good your sight is
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