Advice for user with impaired vision

[Robert Heller]

At Sun, 1 Oct 2017 11:42:15 -0400 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> Hey there,
> 
> Colin Law wrote:
> 
> > I am looking for suggestions to help a friend who has poor vision to
> > use his computer.  Obviously I can make the text and icons larger
> > but I wonder whether anyone can offer any other advice or any tools
> > that might help further. His vision is not so poor that he needs a
> > text to speech screen reader.
> 
> You can find high contrast themes for the desktop, but those are
> pretty gruesome unless you absolutely must use them. If your friend
> isn't at that point, a better suggestion would be to type "color
> wheel" into a search engine and then note the colors that are
> opposite each other on any of those wheels. An interesting behavior
> of colors it that, when opposites are placed next to one another, they
> seem more vibrant. So, for example, if you wanted to choose the colors
> for text and background, opposites would be easier to see.

What is happening is the most opposite colors (esp. red/blue) refract at
different angle (you eye's lens acts like a prisim). This gives the colors a
"3D" effect, with one color slightly out of focus (the colors appear to be on
different focal planes, as if the red letters were "floating" above (or
below?) the blue paper/screen.  Note: this can be anoying to some people.  I 
think red/blue is the most extreme combo.

> 

-- 
Robert Heller             -- 978-544-6933
Deepwoods Software        -- Custom Software Services
http://www.deepsoft.com/  -- Linux Administration Services
heller at deepsoft.com       -- Webhosting Services