Editing Assistive technology (section)

==Computer accessibility==
{{Main|Computer accessibility}}
[[File:Sip-and-puff device.jpg|thumb|A [[sip-and-puff]] device which allows a person with substantial disability to make selections and navigate computerized interfaces by controlling inhalations and exhalations]]
One of the largest problems that affect disabled people is discomfort with prostheses.<ref name=hussein>{{cite journal|last=Abdullah|first=Hussein A.|author2=Tarry, Cole|author3=Datta, Rahul.|author4=Mittal, Gauri S. |author5=Abderrahim, Mohamed|title=Dynamic Biomechanical Model for Assessing and Monitoring Robot-Assisted Upper-Limb Therapy|journal=Journal of Rehabilitation Research and Development|year=2007|volume=44 |issue=1|pages=43–62 |doi=10.1682/JRRD.2006.03.0025|pmid=17551857|doi-access=free}}</ref> An experiment performed in Massachusetts used 20 people with various sensors attached to their arms.<ref name=hussein /> The subjects tried different arm exercises, and the sensors recorded their movements. All of the data helped engineers develop new engineering concepts for prosthetics.<ref name=hussein />

Assistive technology may attempt to improve the ergonomics of the devices themselves such as [[Dvorak Simplified Keyboard|Dvorak]] and other alternative keyboard layouts, which offer more ergonomic layouts of the keys.<ref>{{cite journal |author1=Chubon, R.A. |author2=Hester, M.R. |title=An enhanced standard computer keyboard system for single-finger and typing-stick typing |journal=[[Journal of Rehabilitation Research and Development]] |volume=25 |issue=4 |pages=17–24 |year=1988 |pmid=2973523 }}</ref><ref>{{cite journal |author1=Anson, D. |author2=George, S. |author3=Galup, R. |author4=Shea, B. |author5=Vetter, R. |title=Efficiency of the Chubon versus the QWERTY keyboard |journal=Assistive Technology |volume=13 |issue=1 |pages=40–5 |year=2001 |pmid=12212435 |doi=10.1080/10400435.2001.10132032 |s2cid=12991868 }}</ref>
Assistive technology devices have been created to enable disabled people to use modern touch screen mobile computers such as the [[iPad]], [[iPhone]] and [[iPod Touch]]. The Pererro is a plug and play adapter for [[iOS]] devices which uses the built in [[Apple VoiceOver]] feature in combination with a basic switch. This brings touch screen technology to those who were previously unable to use it. Apple, with the release of iOS 7 had introduced the ability to navigate apps using switch control. Switch access could be activated either through an external bluetooth connected switch, single touch of the screen, or use of right and left head turns using the device's camera. Additional accessibility features include the use of Assistive Touch which allows a user to access multi-touch gestures through pre-programmed onscreen buttons.

For users with physical disabilities a large variety of switches are available and customizable to the user's needs varying in size, shape, or amount of pressure required for activation. [[Switch access]] may be placed near any area of the body which has consistent and reliable mobility and less subject to fatigue. Common sites include the hands, head, and feet. [[eye tracking|Eye gaze]] and head mouse systems can also be used as an alternative mouse navigation. A user may use single or multiple switch sites and the process often involves a scanning through items on a screen and activating the switch once the desired object is highlighted.