RE: Pop quiz

On Oct 20, 2017 10:57 AM, "Repsher, Stephen J" <stephen.j.repsher@boeing.com>
wrote:

Full disclosure: I operate with colors inverted always since I am glare
sensitive and can’t see much of anything on the screen otherwise.  So the
contrast ratio I see is not exactly the same, but very similar.



Looking from a comfortable chair position, C is the only one I can notice
quickly.  B takes me several seconds to spot, but then again I learned
where to study my gaze from the letters and icon for C.  I can’t see
anything next to A without getting very close to the screen

I wonder if a dark border would help call attention to where to look. Seems
the edges help cue the eye where to pay attention and what the boundaries
of attention should be.



Glenda’s point is perfectly valid, but random ordering is not a solution.
Again I’ll caution against trying to put together a survey without
considering and planning for the many input variables and outcomes to study
in an objective, measurable, and statistically significant manner.



The inputs are too many to control in a single study, but all the major
ones need to be controlled or recorded (e.g. eye conditions, distance from
screen, size of screen, resolution/magnification, focal point of vision,
color inversion, other active assistive technology, etc.).

Agree.

As for outputs, take the pencil I assume?) icon of this email as a single
example.  Presenting the same icon at different ratios and asking which I
can “see” is very subjective and won’t correlate well to practical usage.
So what other outputs could be studied?  Just off the top of my head:

1.       Varying the screen location and contrast between questions, you
could determine if I see it or not in a fixed amount of time (similar to a
field of vision test).

For a random test of random user in random location on random device... in
the wild... seems difficult. Difference between clinical vision eval and a
functional vision eval that teachers do.  Dr.s Are always surprised at what
kids can and cant see in the wild. We can capture demographic data and some
on ocation, device, lighting etc. And send out to masses.

2.       Varying the contrast of a typical scenario that icon might be used
between questions,  you could ask me to click it with the mouse and time
how long it takes me it would matter greatly if other things were
clickable, labeled, and what they were though.

Distractors with better contrast. Like it.

The first is more basic research while the second is more about objective
usability.  For every type of graphic, the latter becomes very different.
For example, a pie, bar, or line chart is about reading the results
correctly in a reasonable amount of time, whereas focus or selection
indicator is just about finding it visually in a reasonable time.

Like the practical usability. For icons, buttons, etc. Charts etc ate more
complicated. Like what AC has done with same graphic ... different
treatment.

I’m happy to help plan a test that I think would be useful, but I do not
think a multiple choice contrast survey is going to produce useful results.

Understand where you are comming from. Sti think some iterative research
would bee good.

Jim

Steve



*From:* Alastair Campbell [mailto:acampbell@nomensa.com]
*Sent:* Friday, October 20, 2017 11:01 AM
*To:* Glenda Sims <glenda.sims@deque.com>

*Cc:* LVTF - low-vision-a11y <public-low-vision-a11y-tf@w3.org>
*Subject:* Re: Pop quiz



Hi Glenda,



Yep, makes sense, I’m beta-testing at the moment, just need to create more
examples first such a survey I think.

Do you know if Survey monkey allows for random ordering?



That’s one side, the “is 3:1 enough” question.



The other side is: “How do you identify and test various graphics”, for
which I’ve asked Andrew & Josh for an agenda item at TPAC – a graphics
contrast quiz.



I’ll email out to the main list soon asking for examples.



Cheers,



-Alastair





*From: *Glenda Sims <glenda.sims@deque.com>
*Date: *Friday, 20 October 2017 at 15:53
*To: *Alastair Campbell <acampbell@nomensa.com>
*Cc: *LVTF - low-vision-a11y <public-low-vision-a11y-tf@w3.org>
*Subject: *Re: Pop quiz



A is not enough

B is okay  (but this may be due to the surrounding clues giving in C)

C is best



A quiz like this would be cool in survey monkey...where I'm not seeing all
3 at the same time.  Because C is in my field of vision...I can use it to
tell me what I should see in B and A.  Once my eyes understand "C"....I
think my brain fills in gaps in A and B.



Make sense?

G


glenda sims  |   team a11y lead   |    deque.com    |    512.963.3773
<(512)%20963-3773>
*web for everyone. web on everything.* -  w3 goals



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On Fri, Oct 20, 2017 at 9:42 AM, Alastair Campbell <acampbell@nomensa.com>
wrote:

Hi everyone,



I’m dealing with github comments and thinking about ratios.



I think most people know the github site to some degree?



Without testing, which of these has ‘enough’ contrast for you?





You can probably guess the ratios, so my question is really: Is B enough
for you?



The level of difficulty to meet (with various colours) goes up a lot
between B & C, does the perceptibility?



To me, there is more difference between A & B than B & C, but I’m not
target audience…



Kind regards,



-Alastair



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