Term
| Name five ways in which energy can be expressed. |
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Definition
| Energy can expressed as heat energy, light energy, sound energy, electrical energy and wave energy. |
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Term
| How does light enter the eye? |
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Definition
| Light enters the eye through the cornea (outer layer of the eye. |
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Term
| Define and differentiate photoreceptors. |
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Definition
| Photoreceptors lie on the retina and are classified as rods and cones. Rods respond to low light conditions and cones provide day time vision, color vision and small features. |
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Term
| Where do the optic nerves cross over? |
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Definition
| Optic nerves cross over at the optic chasm. Therefore visual information is contralateral. |
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Term
| Define functional blindness. |
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Definition
| Damage to the primary visual cortex can result in functional blindness which is where the eyes can send information however the person cannot see. |
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Term
| Where does the primary visual cortex receive signals from? |
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Definition
| Research suggests the primary visual cortex receives signals from multiple receptors in the retina, each with a specific sensitivity. |
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Term
| How is visual information received by the brain? |
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Definition
| Visual information is carried from the photoreceptors to the brain via the optic nerves. |
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Term
| Define wave length and its relationship to energy. |
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Definition
| Wave length is the distance from peak to peak and trough to trough. The energy of a wave is dependent upon wav length; shorter wave lengths have more energy. |
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Term
| True or False: Light waves have varying heights. |
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Definition
| False. Light waves are all the same height. |
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Term
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Definition
| Energy is the ability to do work. That does not imply traditional work, but simply the ability to do something. |
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Term
| True or False. Within the visible spectrum, the highest energy waves are perceived as violet while the lowest are perceived as red. |
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Definition
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Term
| What is the purpose of the lens? |
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Definition
| The lens focuses light at the retina at the back of the eye. |
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Term
| Essay Question: Describe the Striate cortex including its appearance, the visual field, receptors and the purpose of the fovia. |
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Definition
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