SENSATION AND PERCEPTION
VISION SENSORY AND PERCEPTUAL PROCESSING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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light rays focusing too far in front of the retina
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light rays focusing too far behind the retina
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a cluster of cells around the fovea which contains cones, but no rods.
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an area without receptor cells where the optic nerve leaves the eye
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Detailed explanation-1: -Blind spot is a region at the back of the eye where the optic nerve exits the eye on its way to the brain. At this spot, no image is formed due to the absence of photoreceptor cells, i.e. rods and cones .
Detailed explanation-2: -The optic disk is the part of the retina where the optic nerve leaves the eye and heads to the brain. In the optic disk, there are no receptor cells. Axons of the retinal ganglion cells gather at the optic disk and form the optic nerve, which carries the neural signal into the brain.
Detailed explanation-3: -Each of our eyes has a tiny functional blind spot about the size of a pinhead. In this tiny area, where the optic nerve passes through the surface of the retina, there are no photoreceptors. Since there are no photoreceptor cells detecting light, it creates a blind spot.
Detailed explanation-4: -The retina is attached to the back of the eye at just one spot. It’s called your blind spot. Because there are no light-sensitive cells at that spot, you can’t see anything that lands in that place on the retina. At the blind spot, all the nerves from the retina join to form the optic nerve.
Detailed explanation-5: -The optic disc is formed by the retinal ganglion cell axons that are exiting the retina. It is located nasal to the fovea (Figure 14.19). This region of the retina is devoid of receptor cells and composed predominantly by the optic nerve layer.