what you will learn today... vision is a complicated process, and we can use several tests to...
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What you will learn today . . .
Vision is a complicated process, and we can use several tests to measure the proper function
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What you will do today…
Conduct the tests used to evaluate visual acuity, astigmatism, the ability to accommodate for close vision, and color vision
Describe four conditions that can lead to defective vision
Demonstrate the blind spot, photopupillary reflex, and convergence reflex
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Sight Lab
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Cow Eye Dissection
Dissect a cow eye to observe the major structures of sight
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Visual Acuity Use a Snellen Chart to
determine your acuity 20/20 vision is normal
Example: If you have 10/20 vision, you have worse than average vision. You must be 10 feet away to see what the average person can see at 20 feet.30/20 vision is better than average.
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Astigmatism Test
Astigmatism is a condition where some parts of an image are sharply focused, while other parts are blurred
It can be diagnosed using an astigmatism chart
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Accommodation Test
Measure the shortest distance at which the eye can see an object clearly, moving toward the eyeball
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Color Vision Test
Use the Isihara Test to determine any color blindness
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Blind Spot Demonstration
Blind spot: the area on the retina where the optic nerve and blood vessels enter and leave the retina, thus there is no visual reception
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Pupillary Reflexes
Shine a light into the eye and measure the pupil
Measure the size of pupil when focusing on objects at different distances
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Negative After-Images: Complementary Colors
Look at a very bright scene or color and then look at a white surface. Record your observations
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Binocular Vision and Space Perception
Observe how objects look differently with one eye closed
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References http://www.developertutorials.com/images/arti
cles/jongos/reflectiveeye/1369517153_5d1f4c562a.jpg
http://apps.uwhealth.org/adam/graphics/images/en/10184.jpg
http://www.beaconlearningcenter.com/WebLessons/MeasuringTools/METRIC_RULER2.gif
http://benskerrett.com/blog/wp-content/uploads/2008/03/binocular-vision.jpg
http://serviceworksconsulting.com/blind_spot/a_blind_spot.gif
http://www.flightglobal.com/blogs/terminal-q/dice.gif
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References http://www.optivision2020.com/image-files/snellen-chart
.jpg http://www.artemis-uk.org/Figures/1919_eclipse_negativ
e.jpg http://www.ext.colostate.edu/pubs/garden/gardimg/
07238f01a.jpg http://www.colblindor.com/wp-content/images/ishihara-
transformation.jpg http://district.bluegrass.kctcs.edu/billd.snyder/
sharedfiles/biowebsite/BiologyLabs/BIO137/137Lab10/Lab10Images/CowEyeCoronal-label.jpg
http://www.logosoftwear.com/embroideryclipart/Needle%20&%20Thread.PST844.gif