16671359
Description
Flashcards by Aamna Khan, updated more than 1 year ago
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Created by Aamna Khan
over 5 years ago
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| Question | Answer |
| eye-camera analogy | images are projected into retinas upside down and mirrored |
| cornea | where the light enters the eye first and most powerful lens in the eye's optical system |
| aqueous homur | refraction - causes light to bend |
| lens | is adjustable allows us to focus on something nearby or far away |
| emmetropic eye | emmetropia - the power of the eye's optical system matches its length (perfect distance vision) |
| myopic eye | myopia - the power of the eye's optical system is greater than is required to focus on the light on the retina and consequently the focal point is in the front of the retina (short sightedness) |
| hypermetropic eye | hypermetropia - the power of the eye's optical system is insufficient to bring the light to a focus on the retina (long sightedness) |
| iris | coloured part of eye controls how much light enters the eye |
| pupil | aperture of eye responds to levels of light |
| photoreceptors rods | black and white can operate in low light have HIGH SENSITIVITY have LOW RESOLUTION |
| photoreceptors cones | colour: red, green and blue need high levels of light to function have LOW SENSITIVITY have HIGH RESOLUTION |
| eye / camera | eye: camera: cornea and lens lens pupil aperture rods and cones black and white film |
| the eye IS NOT like a camera | vision is active, cameras are passive observers illusions, brain interprets visual stimulus different functions |
| retina | is NOT like a camera film we have sharp vision and at the fovea and blurry vision in the periphery we also have a blind spot at our optic disk |
| why we don't notice the blindspot | we have two eyes brain fills in the gaps we are not good at seeing stationary objects |
| sensation and perception | sensation - stimulation of sense organs eye = visual (sight) ear = auditory sense (sound) tongue = gustatory (taste) nose = olfactory sense (smell) skin = cutaneous sense (touch) |
| additional senses | kinaesthetic = movement vestibular = inner ear, balance organic sense = internal organs |
| sensations | a physical feeling or perception resulting from contact on the body linked to sensory receptors |
| perception | an interpretation of sensations influenced by experience |
| synaesthesia | the neurological condition in which two or more senses are coupled eg seeing letters and numbers as colours |
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