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Human Vision Zach Van Sickle Human Vision Zach Van Sickle

Human Vision Zach Van Sickle - PowerPoint Presentation

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Human Vision Zach Van Sickle - PPT Presentation

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

cataracts color blindness vision color cataracts vision blindness http www eye colors html questions eyes org special light images

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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