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A image is upside down and inverted when the image

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a. image is upside down and invertedWhen the image arrives at the back of the eye, or retina, it is upside downand inverted.4. Iris–pigmented muscle between cornea & lens regulating light entering eyeThe iris is the pigmented muscle that lies between the cornea and the lens. Itregulates light entering eye by manipulating the size of the pupil, or theopeningfor light entering the eye.a. Pupil-central opening for light entering eyeThe pupil is the central opening in the iris of the eye and its size isdetermined by the amount of light and the activation of the radial andcircular muscles of the iris.i. dilates-more light entering eye in dim lightIf the light is dim, the pupil will increase in size(mydriasis).ii. constricts-less light entering eye in bright lightIf light is very bright the pupil will decrease in size(miosis)8
D. Neural tunic-inner layer of the eyeThe neural tunic is the innermost layer of the eye and contains the photoreceptors thatwill begin the actual sensation of vision to the brain.1. retina-thin, delicate membrane containing photoreceptorsThe retina is a very thin, delicate membrane which contains the photoreceptors orthe sensory receptors specific to our specialized sense of vision. The neuralpathway for the sense of vision begins with the activation of thephotoreceptors.a. optic disc-axons of photoreceptors exiting eye as Optic nerveThe area in which the axons of the photoreceptors exit the eye as the opticnerve is called the optic disc.i. devoid of photoreceptors-blind spotSince there are no photoreceptors located in the optic disc it isconsidered to be the blind spot of the eye. Anything focusedon thisarea cannot be seen.2. Types of photoreceptorsThe two types of photoreceptors are the rods and the cones.a. rods-black and white vision in dim lightThe rods are used for black and white vision or in dim light.i. evenly dispersed throughout retinaThe rods are evenly dispersed throughout the retinal layer of theeye.b. cones-color vision requiring bright lightThe cones are the receptors for color vision and requirebright light. They are found in greatest concentration in themacula lutea.i. macula lutea–great concentration of cones in this centralized areajust lateral to optic discThis centralized area called the macula lutea is found just lateralto the optic disc.-fovea centralis–very central area of most acute visionThe center of the maculalutea is the fovea centralis. Thisvery central area is where the most acute vision isfoundand why we see things most clearly in ourcentral line ofvision. The process of accommodation istrying to helpfocus the image on this very specific spot on9
the retina.Anything we want to see well, we focus onthe foveacentralis.E. Chambers-fluid filled structures maintaining eyeball shape and assisting the corneaand lens with refracting (bending) light to focus on retinaThese fluid filled structures maintain eyeball shape. They also assist the cornea and lens

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Term
Spring
Professor
Drschumerr
Tags
temporal lobe, hair cell

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