Scientific American: Psychology
Infographic Activity 3.2: Seeing
Seeing
"Seeing" involves more than simply looking at an object. Vision is a complex process in which light waves entering the eye are directed toward the retina where they are transduced into messages the brain can understand. The triplets all experienced vision loss from retinopathy of prematurity (ROP), a condition in which blood vessels in the retina grow incorrectly. Damage to this crucial structure has a severe impact on vision.
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1. When light enters the eye, the very first structure that it passes is a clear, transparent membrane called the ________.
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2. The pupil is an opening in the center of the eye that allows light to pass to the retina. The iris, however, is responsible for controlling the amount of light that gets in. Why is this?
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3. Which two structures in the eye are primarily responsible for focusing light waves toward the retina, bending them and projecting an inverted image?
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4. Aimee is pregnant with her first child, and goes into labor far earlier than she should. The child, a little boy, is born very premature, and receives continual medical care and observation for the first few months of his life. Aimee’s doctors tell her that her son has an increased risk of several problematic medical conditions, including retinopathy of prematurity, or ROP. Aimee’s son must have been born before ____ weeks of pregnancy for this to be a significant concern.
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5. Winston is reading his textbook as he studies for his art history exam. The words on the page enter his eyes and then are received by the retinas at the back of his eyes. What is the correct order of cells that the light signals are translated through on their way to the brain?
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