learn about users: aging: changes in visual function gaël vasseur tokyo institute of technology...
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Learn about users:Aging: Changes in visual function
Gaël VasseurTokyo Institute of Technology
Graduate school of Information Science and Engineering
Department of Computer Science
Nakajima laboratory
Master 1st year
How big is the problem?
Background information on human vision
Changing in vision function
Some Low Vision Products
Content
How big is the problem?
Background information on human vision
Changing in vision function
Some Low Vision Products
How Big is the Problem?
Some numbers: 13% of the population is over 65 25% of the population is over 50, the age of when
decline begins in 30 years, the 65+ population will double (66 million
people) over 85 is the fastest growing segment of the
population these numbers don't include the large population of
younger people with low vision from other causes.
How big is the problem?
Background information on human vision
Changing in vision function
Some Low Vision Products
Content
How big is the problem?
Background information on human vision
Changing in vision function
Some Low Vision Products
The human vision system:a very simple system
The human vision system:a very simple system
The human vision system:a very simple system
•Retina
The human vision system:a very simple system
•Retina
The retina :•contains the light receptors, the rods and cones •process the signals arising in the rods and cones before passing them back to the brain
The human vision system:a very simple system
•Retina (2)
The macula :•a small and highly sensitive part of the retina responsible for detailed central vision•allows us to appreciate detail and perform tasks that require central vision such reading
The Fovea:•Very center of the macula
The human vision system:a very simple system
•Retina (3)
The blind spot:point on the retina where the approximately 1 million axons converge on the optic nerve, there are no rods or cones
•Insensitive to light
The human vision system:a very simple system
•Lens
The human vision system:a very simple system
•Lens
The Lens:Its shape is controlled by the ciliary muscle
•enable the eye to adjust its focus between far objects and near objects
How big is the problem?
Background information on human vision
Changing in vision function
Some Low Vision Products
Content
How big is the problem?
Background information on human vision
Changing in vision function
Some Low Vision Products
Changes in visual function
Aging effects on vision
Normal changing on aging eyes Losing focus Declining sensitivity Needing More Light
Eye disorders, health problems or injuries Macular degeneration Glaucoma Cataract Diabetic retinopathy
Aging effects on vision
Normal changing on aging eyes Losing focus Declining sensitivity Needing More Light
Eye disorders, health problems or injuries Macular degeneration Glaucoma Cataract Diabetic retinopathy
Aging effects on vision
Normal changing on aging eyes Losing focus (presbyopia)
Cause: lens begins to lose elasticity, difficult to focus when looking close objects
Affect activities such as reading
Aging effects on vision
Normal changing on aging eyes Declining sensitivity
Cause: The lens of the eye also becomes increasingly dense and more yellow
Affect color perception and contrast sensitivity
Make it difficult to see curves, Steps…
Aging effects on vision
Normal changing on aging eyes Declining sensitivity
Aging effects on vision
Normal changing on aging eyes Needing More Light
Cause: pupil gets smaller, need for more light to see well, more time to adjust to changing levels of illumination
Difficult to see when entering dimly restaurants, theaters…
Aging effects on vision
Normal changing on aging eyes Losing focus Declining sensitivity Needing More Light
Eye disorders, health problems or injuries Glaucoma Macular degeneration Cataract Diabetic retinopathy
Aging effects on vision
Eye disorders, health problems or injuries Glaucoma
The optical nerve is damaged
•subtle loss of contrast •difficulty driving at night
•loss of peripheral vision (late-stage glaucoma)
Aging effects on vision
Eye disorders, health problems or injuries Glaucoma
Aging effects on vision
Eye disorders, health problems or injuries Glaucoma
Aging effects on vision
Eye disorders, health problems or injuries Macular degeneration
The macula (central part of the retina) is damaged.
Effects: central vision loss
•vision becomes blurred and distorted•reading becomes difficult
•color vision is reduced•increased need for light
Aging effects on vision
Eye disorders, health problems or injuries Macular degeneration
Aging effects on vision
Eye disorders, health problems or injuries Cataract
Clouding of the lens that reduces visual acuity
•vision seems hazy •trouble distinguishing colors
•increased sensitivity to glare; light scatters and appears like a "halo"
Aging effects on vision
Eye disorders, health problems or injuries Cataract
Aging effects on vision
Eye disorders, health problems or injuries Diabetic retinopathy
Entire retina (including macula) damaged by leaking blood vessels (caused by diabetes)
•blurred vision •near vision distortion (difficulty reading)
Aging effects on vision
Eye disorders, health problems or injuries Diabetic retinopathy
How big is the problem?
Background information on human vision
Changing in vision function
Some Low Vision Products
Content
How big is the problem?
Background information on human vision
Changing in vision function
Some Low Vision Products
How Big is the Problem? (review)Some numbers: 13% of the population is over 65 25% of the population is over 50, the age of when
decline begins in 30 years, the 65+ population will double (66 million
people) over 85 is the fastest growing segment of the
population these numbers don't include the large population of
younger people with low vision from other causes.
How Big is the Problem?(review)Some numbers: 13% of the population is over 65 25% of the population is over 50, the age of when
decline begins in 30 years, the 65+ population will double (66 million
people) over 85 is the fastest growing segment of the
population these numbers don't include the large population of
younger people with low vision from other causes.
•Low vision products are a very big market!!
•Future products must be usable byold people
Low vision products
Examples:
Make bigger
objects
Low vision products
Examples:
Make objects
bigger
Conclusion
There is a real need for products design for people suffering from low vision problems:
“If medicine cannot help people well to use objects, let’s make the objects easier to use”
Related papers & web-sites
LightHouse International “Aging Vision, A publication for Practitioners, Researchers and Educators Volume 16 Number 1 Spring 2004”
Hppt://www.Ligthhouse.org Ian Overington “Computer Vision, a unified, biologically-inspired
approach” Sowerby research center, British aerospace PLC, 1992.
http://www.findaneyedoc.com/ http://www.stlukeseye.com/ http://www.nanopac.com/ http://www.independentliving.com/
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