A user with low but usable vision can read text once it is large enough, and needs a movable enlarged view of whatever part of the screen the pointer is over, rather than having the whole desktop scaled. Which assistive technology fits, and what would the high contrast desktop theme have done instead?
LPIC-1 Exam 102-500, objective 106. User interfaces and desktops medium
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The options
Correct A screen magnifier; a high contrast theme would have changed the colour scheme to strongly separated foreground and background colours, without enlarging anything.
Correct. A magnifier enlarges a region and follows the pointer or the keyboard focus. High contrast is purely a palette change, and helps with distinguishing elements rather than with their size.
Not correct A screen reader; a high contrast theme would have enlarged all fonts to the large print size.
Wrong on both halves. A screen reader speaks the interface aloud and is for users with no usable vision; enlarging fonts is what a large print theme does, not what high contrast does.
Not correct A braille display; a high contrast theme would have inverted the colours of the pointer only.
Wrong. A braille display renders text as refreshable braille cells for a blind user and is driven by the screen reader. High contrast affects the whole desktop palette, not just the pointer.
Not correct An on-screen keyboard; a high contrast theme would have raised the display's backlight brightness.
Wrong. An on-screen keyboard is an input aid with no bearing on vision, and a desktop theme changes drawing colours in software; it does not touch the panel's backlight.
Why
The visual aids form a ladder by how much sight remains. Some usable vision: high contrast themes for separation, large print themes for size, and a screen magnifier for a movable enlarged region. No usable vision: a screen reader such as Orca, optionally driving a refreshable braille display. Themes and magnification are desktop settings; readers and braille support are separate services that the desktop's accessibility framework connects to applications.
Where this comes from
- Cited
- LPI exam objective 106.3
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