Percep_Study_questions_test2

Percep_Study_questions_test2 - Optics and the Eye 1. Sketch...

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Optics and the Eye 1. Sketch a human eye and label important structures. In particular, the colored muscle that controls how much light gets into your eye is the __________. The “hole“ in your eye that lets light in is known as the ______________. The white part of the eye is called the __________________. The cornea is located where? The iris is the colored muscle that controls how much light gets into your eye. The “hole” in your eye that lets light in is known as the pupil. The white part of your eye is called the sclera. The cornea is the thin transparent covering of the eyeball. 2. Given that the cornea is transparent (without blood vessels), it must be nourished by a continuous cycle of fluids from the back of the eye to the front of the eye. What are the consequences if this flow of fluids becomes blocked? What is the modern treatment for this disease? Glaucoma is caused by a blockage of flow. If blockage is in Shlemm’s canal, it can be treated by drugs. 3. Even when sight is restored through corneal implant/transplant, explain why patients who have been blind for most or all of their lives still can’t see very well? If blind most of their lives, patients never acquire a good facility at grouping together feature from different positions within the image nor features at different points in time from different perspectives. In other words, your brain doesn’t process the “tricks” that would be processed by a person who has had vision their whole lives. So what they see doesn’t always make sense. 4. Give brief definitions for the following optical phenomena: reflection, refraction, diffraction, and dispersion. Describe how each phenomenon is involved in forming the retinal image. Reflection is when light bounces off an object towards your eye. Diffraction is the phenomenon whereby light bends around edges of occluding objects and spreads out when passing through a narrow aperture. Dispersion is the phenomenon in which different wavelengths of light refract by different amounts (e.g. white light passing through a prism makes a rainbow). Refraction is how the light bends from one medium to another. 5. If you are using a pinhole camera to take a picture and the resultant image is too blurry, your pinhole is too large . Also note that is the pinhole is too small not enough light can get in for a dimly lit environment, which also will cause a poor image. 6. a. Explain how light comes into the eye such that the image is formed upside-down on the retina. b. Why do you see upright? c. Explain how you might experience an illusion in which you see a smaller tree that is closer to you as being the same size as a larger tree that is farther away from you. The light the hits the objects you are looking at reflects back in your eye hitting it
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This note was uploaded on 04/18/2008 for the course PSYCH V89.0022 taught by Professor Landy during the Fall '08 term at NYU.

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Percep_Study_questions_test2 - Optics and the Eye 1. Sketch...

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