RE: Mobile needs a question answered

Hi Wayne,

The visible boundary of a button could be larger or smaller than the hit target.

For example, I’m not clear from the research & discussion so far whether it is better to have medium buttons spaced far apart, or large buttons closely spaced.

E.g. imagine 4 buttons across the bottom of a 320px wide screen.

Is it better to have:

  *   4 buttons at 80px wide and no margin between, or
  *   4 buttons at 70px wide and ~13px margin between them?

The centre of each button could be the same distance apart, but which is easier? Do the phone OS heuristics make a difference to the question, or nullify the difference?

These are questions for the mobile TF really, but I just wanted to understand the question being asked.

Cheers,

-Alastair


From: Wayne Dick <wayneedick@gmail.com>
Sent: 30 January 2019 14:47
To: Alastair Campbell <acampbell@nomensa.com>
Cc: Jonathan Avila <jon.avila@levelaccess.com>; Jim Allan <jimallan@tsbvi.edu>; public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org>
Subject: Re: Mobile needs a question answered

Hi Alastair,
It kind of reduces to the same thing. It easy to miss a target you cannot separate from another. I'm a little embarrassed to admit how many times I hit the wrong target.
Wayne

On Wed, Jan 30, 2019 at 12:41 AM Alastair Campbell <acampbell@nomensa.com<mailto:acampbell@nomensa.com>> wrote:
Hi Jim,

Was that for seeing things, or hitting the targets?

Those seem like different problems, especially as the touch-screen OSs have heuristics so that if you tap between two targets, it guesses which you meant...

-Alastair

Apologies for typos, sent from a mobile.

________________________________
From: Jonathan Avila <jon.avila@levelaccess.com<mailto:jon.avila@levelaccess.com>>
Sent: Tuesday, January 29, 2019 11:45 pm
To: Wayne Dick; Jim Allan
Cc: public-low-vision-a11y-tf
Subject: RE: Mobile needs a question answered

HI Wayne, I also think that people with low vision might need more space because touch might not be as precise given that a person may be holding the device closer to their face and not have the same perspective as distance.  Also scotomas may also impact touch target accuracy for some users.

Jonathan

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From: Wayne Dick <wayneedick@gmail.com<mailto:wayneedick@gmail.com>>
Sent: Tuesday, January 29, 2019 5:24 PM
To: Jim Allan <jimallan@tsbvi.edu<mailto:jimallan@tsbvi.edu>>
Cc: public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org<mailto:public-low-vision-a11y-tf@w3.org>>
Subject: Re: Mobile needs a question answered

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Hi All,
Well all zoomed pixels are large, but that is only so that we can see them. So, I would assume that it takes 2-pixels for full sighted readers to separate things, it would take us 2 big pixels to distinguish things.

Wayne

On Tue, Jan 29, 2019 at 1:47 PM Jim Allan <jimallan@tsbvi.edu<mailto:jimallan@tsbvi.edu>> wrote:
How many pixels in between 2 active elements on a screen meets user need on the low-vision side? Mobile TF have it at two pixels.
And does the overall target size impact the spacing between elements requirement?
Anybody have any ideas or research?



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Jim Allan, Accessibility Coordinator
Texas School for the Blind and Visually Impaired
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