Flashcards
psychophysics #4
Cards in this deck (14)
- 1accomodationThere is a fixed lens-retina distance but a variable lens thickness which is used to accomodate for far away objects and near objects and acheive focus
- 2Parts of the eye involved with accomodation
- 3Light hits the retina in ___ from distant objects >6m for close objects the light ___parallel
diverges - 485% of the light refraction is doneby the cornea and the aqueous humor
- 5the ciliary muscle and the zonule fibres ___ and ___ to accomodatecontract and relax
- 6what is the sphincter musclethe ciliary
- 7Far visionciliary muscle relaxes
zonule fibres contract
(pulling lens thinner) - 8Near visionciliary muscle contracted
zonule fibres relaxed
(squishing the lens fatter) - 9Emmetropianormal vision: Unaccomodated state can see an infinite distance in focus, accomodated state can see objects up to 10cm away in focus
- 10Myopianearsightedness
eye is longer and focus point after light is refracted is infront of the fovia. A concave lens (negative, diverging lens) makes light diverge before the cornea and then after the eye has refracted it the new focus point is at the fovea - 11Hyperopia or hyperetropiaFarsightedness
eye too short, refracted light focuses beyond the fovea. It can partially accomodate for long distances but the closest near focus is >1m. A convex lens converges light before the cornea allowing the focus to hit the fovea. - 12Eye and camera similaritiesIris = diaphragm
Single or multiple lens = cornea+aqueous+lens
Nonreflecting interior = Pigmented choroid - 13eye and camera differencesFilm/digital sensors are not equivalent to retina
- 14—
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- Flashcards on psychophysics #4, created by cjjstone on 22/05/2014.
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- cjjstone
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