Alyssa Kaeser Color Blindness The eye detects three colors red blue and green All other colors are a combination of varying degrees of these three colors Color blindness is a vision deficiency in which the perception of colors is different from one person than that of normal vision ID: 708263
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Slide1
Human Vision
Zach Van Sickle
Alyssa KaeserSlide2
Color Blindness
The eye detects three colors: red, blue, and green. All other colors are a combination of varying degrees of these three colors.
Color blindness is a vision deficiency in which the perception of colors is different from one person than that of normal vision.
Color blindness varies in intensity, the most severe cases being those of complete color blindness.Color blindness is due to an inactive photopigments caused by defective genes.There are three types of colorblindness, due to which gene is affected.
https://nei.nih.gov/health/color_blindness/facts_aboutSlide3
Color Blindness
There is no cure for color blindness. However, people with red-green color blindness may be able to use a special set of lenses to help them perceive colors more accurately.
Visual aids have also been developed to help people cope with color blindness. There are iPhone and iPad apps, for example, that help people with color blindness differentiate between colors
https://www.cnet.com/news/dankam-smartphone-app-aids-the-color-blind/Slide4
Cataracts
A cataract is a clouding of the normally clear lens of your eye.
Clouded vision caused by cataracts can make it more difficult to read, drive a car (especially at night) or see the expression on a friend's face.
Cataracts are caused in several ways including: age related, congenital, secondary, and trauma.http://www.mayoclinic.org/diseases-conditions/cataracts/home/ovc-20215123Slide5
Cataracts Symptoms
vision that’s cloudy, blurry, foggy, or filmy
Nearsightedness
(in older people)Problems driving at night Problems with glare during the day
Double vision in the affected
eye
Trouble with
eyeglasses
or
contact lenses
not working well
Changes in the way you see color
http://www.webmd.com/eye-health/cataracts/what-are-cataracts#1Slide6
Cataracts
In mild cases, cataracts can be treated with glasses or contacts lenses.
In severe cases, cataract surgery may be
necessary to correct vision.Cataract surgery consists of removal of the outer lens and a replacement with an artificial lens.
http://www.webmd.com/eye-health/cataracts/what-are-cataracts#1Slide7
Rods
Rods
: Receptors in our eyes that are highly perceive to light and dark
These perceive motion the most and are much more numerous than cone receptors. These are most responsible for our night vision because they perceive light well.Rods are more numerous in our periphery, which is why we can see objects in dim light better when looking beside them instead of
directly at them.
http://faculty.washington.edu/chudler/retina.htmlSlide8
Cones
Cones
: Receptors in our eyes responsible for the perception of color
These are less numerous in the eye than rods and only work well in bright light.This is why we don’t see color in dim light; however, cone receptors allow us to detect finer details than rods allow.http://faculty.washington.edu/chudler/retina.htmlSlide9
Binocular Vision
Binocular Vision
- Vision wherein both eyes aim simultaneously at the same visual target
STEREOPSIS: (or stereoscopic vision) vision wherein two separate images from two eyes are successfully combined into one image in the brain.http://www.children-special-needs.org/questions.htmlSlide10
How it Works
Both eyes aimed at the same target perceive two similar(but not identical) images
The brain sorts out the two different images and combines them into one.
Because the combined images are different, the resulting image has an added depth dimensionhttp://www.children-special-needs.org/questions.htmlSlide11
This is how the brain takes the two different images and combines them into one three-dimensional image
http://www.children-special-needs.org/questions.htmlSlide12
Common Tasks that Require Binocular Vision
Throwing, catching or hitting a ball
Driving and parking a car
Planning and building a three-dimensional objectThreading a needle and sewingReaching out to shake someone's hand
Pouring into a container
Stepping off a curb or step
http://www.children-special-needs.org/questions.htmlSlide13
Review Questions
T/F: The eye detects red, blue, and purple as it’s base colors.
T/F: There are visual aids to correct
color blindnessT/F: Cataracts is an inflammation of the eyeT/F: A symptom of cataracts is a glare during the day or while driving at night.T/F: There is no treatment or aid for cataracts.Slide14
Review Questions
6. What in our eyes is responsible for perceiving light and dark?
7. What in our eyes is responsible for the detection of color?
8. T/F Humans have stereoscopic vision. 9. What organ in our body merges images from each eye into a three-dimensional image?10. T/F We can have proper depth perception with one eye closed.Slide15
Works Cited
Facts About Color Blindness. (2015, February). Retrieved February 23, 2017, from https://nei.nih.gov/health/color_blindness/facts_about
Kozarsky, A., MD. (2016, September 24). What Are Cataracts? Retrieved February 24, 2017, from http://www.webmd.com/eye-health/cataracts/what-are-cataracts#1
Cooper, R. (n.d.). What is Binocular Vision? Retrieved February 24, 2017, from http://www.children-special-needs.org/questions.htmlChudler/University of Washington, E. H. (n.d.). Neuroscience For Kids. Retrieved February 24, 2017, from http://faculty.washington.edu/chudler/retina.html