[Author: Bill Fischer]
About 47% of the U.S. population is regularly experiencing some form of disability (not including situational limitations), and about 2/3 of all internet connections are made with a mobile phone via cell signal (the baseline technology for low income populations). Photo Illustration by Bill Fischer.
Hearing disabilities include a range of hearing impairments beyond those that cannot hear at all. Providing captions and transcripts provide a lifeline to content for these individuals.
U.S. Population Statistics for Hearing Disabilities (2012)
Total (adults) 37.5 million (15%)
- About 2 to 3 out of every 1,000 children in the United States are born with a detectable level of hearing loss in one or both ears
Blindness and Low Vision
Many individuals who are blind interact with computers using screen-reader software. Individuals who are blind cannot browse content the way sighted individuals do (by visually scanning and finding the relevant information). For them, content is experienced linearly, by tabbing through categories of information, such as, menus, links and headings.
Individuals who have low-vision or who have photosensitivity issues also can be affected by inaccessible content. The use of high contrast, audio, and logical design layout with clearly delineated sections will provide meaningful experiences for the sight impaired.
U.S. Population Statistics for Visual Disabilities (2016)
Total (all ages): 7,675,600 (2.4%)
- Total (16 to 75+): 7,208,700 (2.83%)
- Age 16 to 64: 4,037,600 (2.0%)
- Age 65 and older: 3,171,100 (6.6%)
Individuals who are colorblind or who have photosensitivity issues also can be affected by inaccessible content. The use of colorblind-friendly colors, high contrast, audio, and logical, consistent layout will provide meaningful experiences for the sight impaired.
World Population Statistics for Color Blindness
Total All ages: (4.5 %)
- 8 % of men
- .5 % of women
- By far the most common form is red-green colorblindness, which includes 99.999% of all instances.
- 72% have a moderate anomaly. 38% have a severe anomaly.
- Blue-yellow and achromatic (no color ability) color blindness is rare and includes .0001%.
This Illustration demonstrates what can happen when the color red is used as an accent. The effect is significantly subdued for a red-green colorblind person, as shown at the bottom.
According to the National Institute of Health, Photophobia is a common yet debilitating symptom seen in many ophthalmic and neurologic disorders. It is defined as an abnormal sensitivity to light, especially of the eyes, and is reported in most all forms of migraine and many neuro-ophthalmic disorders. Persons with this condition can experience migraines and flickering from images and text with high value and hue contrast (over 16:1 ratio). They will typically use accessibility features on digital devices that dim the brightness or convert screens to grayscale.
About 12% of adults experience migraines with women twice as likely to be affected. Photophobia is one of the most common symptoms of migraine.
Keyboard access is the most important concept when thinking about the accessibility of content for individuals with mobility disabilities. Some people have partial or no use of arms, hands or fingers. Additionally, many other individuals have limited control of their arms, others have diminishing fine motor controls. All of these individuals might have difficulty using a mouse, many only use the keyboard to navigate. Others use items such as trackballs, adaptive keyboards, head-wands, mouth-sticks, and speech recognition software.
U.S. Population Statistics for paralysis (2013)
Total all ages in the U.S. report that they were living with some form of paralysis: 5,357,970 (1.7%)
Some people have a difficult time speaking or cannot speak at all. This is an especially important population to consider as technology begins to move more towards spoken controls for interactive devices (such as Google Home and Amazon's Echo).
U.S. Population Statistics for Speech Disability (2015)
Total All Adults: 9.4 million (4 %)
- Approximately 9.4 million (4.0%) adults report having a problem using their voice that lasted one week or longer during the last 12 months.
Many people land within a spectrum of cognitive disabilities such as ADHD and dyslexia, as well as a variety of other comprehension challenges. Disorganized and poorly written content is a barrier to accessibility. These individuals benefit from well structured, semantically organized media that provide multiple means of access that can include, text, illustrations, diagrams, video or audio. Assisted learning technologies such as screen readers, captions and video are very useful for these people with seemingly invisible disabilities.
'Harley's Story' provides a terrific case study for assistive technology and its use for the cognitively impaired (external link) from The Center of Inclusive Design and Innovation at Georgia Tech. University (linked in).
U.S. Population Statistics for Cognitive Disability (2002)
Total All Adults: 13,474,000 million (7.5 %)
- Civilian, non-institutionalized men and women aged 18-64 in the United States that reported a work limitation.
Sometimes disabilities are caused by known factors and full or partial recovery can be expected. This can include situations like these:
- Where cataracts and cataract removal surgery clouds vision and cause light sensitivity.
- Broken fingers and hands make navigating digital media challenging.
- Tinnitus (ringing in the ears) can be caused by loud music or infections.
- Medications can limit our ability to concentrate.
An often-overlooked area of accessibility are the needs of individuals who are temporarily unable to access media in certain ways. This can include situations like these:
- Where audio would disturb those around us (such as on a bus or in a waiting room).
- When we are caring for a child and cannot be focused consistently on a screen.
- Perhaps we are just having a difficult time concentrating when we are tired.
- Brightly lit rooms with dim computer displays or projections can make screens difficult to see.
The digital display on the left demonstrates the color dulling effect of a low-light-energy-saving mode. On the right, glare from direct sunlight can wash out the brightest digital display. These are common situational limitations
The smart phone is often a person's only available access to digital media. Over 50% of web page views worldwide occur on mobile devices. Websites, documents and digital media in general, must be compatible with smart phones and slow 3g connections to be fully accessible. Situations where mobile devices are the only option include:
- Low income people whose only digital device is a smart phone.
- People that are traveling short and long distances.
- People that are in situations where a laptop or desktop computer is not an option (like an impromptu meeting or public venue).
An article in Education Week magazine called "The Digital Divide and Educational Equity" outlined access for students.
September 25, 2018
The lack of access to technology and internet connectivity at home is especially severe among poor, rural, and minority students, according to a new survey from ACT's nonprofit Center for Equity in Learning.
Based on a random sample of 7,000 students who took the ACT in 2017, the survey finds 14 percent of students have access to only one device at home, and 85 percent of those students are classified as "underserved"—defined in the report as economically disadvantaged, first-generation college students or people of color. By contrast, only 5 percent of students whose families make at least $100,000 a year and 7 percent of those whose parents have college degrees reported having a single device.
The report also finds more than half of students with only one device at home said it was a smartphone.
By Lauraine Genota
Vol. 38, Issue 06, Page 4
Published in Print: September 26, 2018, as Education Technology and on the web (external link)