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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Presentation transcript:

What you will learn today... Vision is a complicated process, and we can use several tests to measure the proper function

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

Sight Lab

CowCow Eye Dissection Dissect a cow eye to observe the major structures of sight

VisualVisual 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.

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

Accommodation Test Measure the shortest distance at which the eye can see an object clearly, moving toward the eyeball

ColorColor Vision Test Use the Isihara Test to determine any color blindness

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

Pupillary Reflexes Shine a light into the eye and measure the pupil Measure the size of pupil when focusing on objects at different distances

Negative After-Images: Complementary Colors Look at a very bright scene or color and then look at a white surface. Record your observations

Binocular Vision and Space Perception Observe how objects look differently with one eye closed

References ngos/reflectiveeye/ _5d1f4c562a.jpg ngos/reflectiveeye/ _5d1f4c562a.jpg jpg jpg MeasuringTools/METRIC_RULER2.gif MeasuringTools/METRIC_RULER2.gif content/uploads/2008/03/binocular-vision.jpg content/uploads/2008/03/binocular-vision.jpg _spot.gif _spot.gif

References pg pg transformation.jpg transformation.jpg bsite/BiologyLabs/BIO137/137Lab10/Lab10Images/CowEyeCoro nal-label.jpg bsite/BiologyLabs/BIO137/137Lab10/Lab10Images/CowEyeCoro nal-label.jpg 20Thread.PST844.gif 20Thread.PST844.gif

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