Podcast
Questions and Answers
What is the primary function of the cornea?
What is the primary function of the cornea?
- To bend light toward the center of the eyeball, providing focusing power (correct)
- To transmit signals to the brain via the optic nerve
- To control the amount of light entering the eye
- To focus images on the retina
Which structure in the eye is responsible for adjusting the size of the pupil?
Which structure in the eye is responsible for adjusting the size of the pupil?
- Retina
- Crystalline Lens
- Iris (correct)
- Cornea
What is the role of the crystalline lens in vision?
What is the role of the crystalline lens in vision?
- To protect the eye from external damage
- To control the amount of light that enters the eye
- To transmit visual signals to the brain via the optic nerve
- To change shape and focus images onto the retina for both near and far objects (correct)
Which part of the eye contains the photoreceptors?
Which part of the eye contains the photoreceptors?
What is the primary function of the pupil?
What is the primary function of the pupil?
Approximately how many neurons are estimated to be in the retina?
Approximately how many neurons are estimated to be in the retina?
Which of the following best describes the process that takes place between the retina and the brain?
Which of the following best describes the process that takes place between the retina and the brain?
Which of these eye structures is primarily responsible for refracting light as it enters the eye?
Which of these eye structures is primarily responsible for refracting light as it enters the eye?
What is the primary function of photoreceptors in the visual system?
What is the primary function of photoreceptors in the visual system?
Which photoreceptors are primarily responsible for vision in dimly lit conditions?
Which photoreceptors are primarily responsible for vision in dimly lit conditions?
What is an Afterimage?
What is an Afterimage?
Where are cones primarily concentrated in the retina?
Where are cones primarily concentrated in the retina?
What is responsible for carrying neural impulses from the eye to the brain?
What is responsible for carrying neural impulses from the eye to the brain?
What is the ‘blind spot’ in the human visual field caused by?
What is the ‘blind spot’ in the human visual field caused by?
According to the Young-Helmholtz Trichromatic Theory, what three colors are the primary receptors in the retina sensitive to?
According to the Young-Helmholtz Trichromatic Theory, what three colors are the primary receptors in the retina sensitive to?
What is most likely the symptom for someone with color deficient vision?
What is most likely the symptom for someone with color deficient vision?
Flashcards
Photoreceptors
Photoreceptors
Cells that convert light energy into neural impulses.
Rods
Rods
Photoreceptors that function well in low light and detect movement.
Cones
Cones
Photoreceptors concentrated in the fovea, responsible for color vision.
Afterimage
Afterimage
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Optic Nerve
Optic Nerve
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Blind Spot
Blind Spot
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Young-Helmholtz Trichromatic Theory
Young-Helmholtz Trichromatic Theory
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Color-Deficient Vision
Color-Deficient Vision
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Pupil
Pupil
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Iris
Iris
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Crystalline Lens
Crystalline Lens
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Retina
Retina
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Dominant Sense
Dominant Sense
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Study Notes
Sensation & Perception Intro
- The session agenda includes a warm-up, vision notes, a review of those notes, eye poster creation, and presentations.
- The warm-up activity involves closing your eyes and describing what you see, aiming for 3-4 sentences.
Agenda
- Warm-up: 5 minutes
- Vision Notes: 25 minutes
- Notes Review: 10 minutes
- Eye Poster: 35 minutes
- Presentations: 10 minutes
The Science of Seeing
- A substantial portion of the brain is dedicated to processing visual information.
- Vision is the most important sense.
- Light travels through the eye, impacting various structures.
Eye Anatomy
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Cornea: A transparent, dome-shaped structure on the front of the eye. It's responsible for focusing or refracting light.
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Pupil: An adjustable opening in the center that controls the amount of light entering the eye.
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Iris: The colored portion of the eye, composed of muscle tissue that regulates pupil size.
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Lens: A transparent structure behind the pupil that adjusts its shape to focus images onto the retina. It focuses the eye on near and distant objects.
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Retina: The light-sensitive layer lining the back of the eye.
- It includes photoreceptor cells: Rods and Cones.
- Rods: Function well in low light conditions and help with our night vision, peripheral vision, and our perception of movement.
- Cones: Function better in bright light and give us our color vision.
- There are 120 million rods and about 1 million cone photoreceptors in the retina.
- Cones are concentrated in the fovea, the point of sharpest vision.
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Fovea: Point of central focus on the retina.
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Optic nerve: Carries neural impulses from the eye to the brain.
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Blind spot: Area where the optic nerve exits the eye, lacking photoreceptors. Saccades (rapid eye movements) help compensate for the blind spot.
Color Vision
- Young-Helmholtz Trichromatic Theory: Three types of cones (red, green, blue) in the retina combine to produce all colors.
- Color-deficient vision: Occurs from missing or malfunctioning cones, making it hard to distinguish specific colors.
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