Describe the blindspot demonstration, what happens to the image of the dollar sign before and after the dollar sign disappears, and what it tells us about the anatomy of the eye. Apply the terms pupil, fovea, retina, optic nerve, and blind spot.
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Step 1: The blind spot demonstration involves holding a card with a dollar sign on it in front of one eye, while focusing on a fixed point in the distance. Show more…
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1.Describe the path traveled by a ray of light as it enters the eye and passes to the retina. 2.List the three tunics of the eye and their respective components. 3.Locate the blind spot for each of your eyes by drawing a small dot on the left side and a small "x" on the right side of an unlined, white index card. Hold the card about 20 cm (~8 in) from your face, close your right eye, and look at the "x" with your left eye. Move the paper slowly toward your face. When the dot is no longer visible, its image has fallen on the blind spot of the left eye. Repeat the process with the left eye closed and right eye open while looking at the dot. When the "x" disappears, its image is focused on the blind spot of the right eye. Were you able to find your blind spot for each eye? What is the blind spot?
Suman K.
Using the terms provided, complete the paragraph on the blind-spot demonstration. optic nerve optic disc photoreceptors blind spot retina There are no ________ in the ________, located where the nerve fibers of the ________ leave the eye and enter the ________. Consequently, this region of the retina is commonly called the ________.
Adi S.
This test is for the presence of the blind spot near the optic disc. The optic disc is a part of the eyeball where the optic nerve exits. To perform this test, hold the page about 8 inches away from your face. To test the right eye, close the left eye and focus on the plus sign with the right eye. You should be aware of a dot in the periphery of your vision. While continuing to stare at the plus sign, slowly move the page towards your face. At a certain distance, the dot will disappear from your peripheral vision and come into focus on the optic disc. To test the left eye, close the right eye and focus on the dot with the left eye while slowly moving the page towards your face. The plus sign will disappear from your peripheral vision when it falls on the optic disc. Why is there a blind spot at the optic disc? Why are you not aware of this blind spot except when performing this test?
Sri K.
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