Re: Acuity for 400% zoom

Hey Shawn,

My left eye (uncorrected) is 20/550.  So I just tried an experiment.  I
opened word.  copied the text of your email, pasted it into word.  set font
to Arial, size to 12 point.  Then I increased magnification (in Word) to
400%.

I can't read that text (on my laptop) at a normal viewing distance of 22"
(the laptop screen is 22" inches from my eyeballs...yes, I did just measure
with a tape measure).

As I bring the laptop closer to my face...I can read this same text...when
the laptop is 15" from my eyes.

So...I wonder if someone on this list has something in the vicinity of
20/400 or 20/300 and can conduct a similar experiment.

G

*glenda sims* <glenda.sims@deque.com>, cpacc
<http://www.accessibilityassociation.org/certification>   | team a11y lead
| 512.963.3773

        deque systems <http://www.deque.com>  accessibility for good

On Mon, May 28, 2018 at 7:56 PM, Wayne Dick <wayneedick@gmail.com> wrote:

> Dear Shawn,
> We all read differently. You bring up a good research point.
> I am right eyed. My right eye is so much better than the left that I
> barely know how to read with my left. Also, only parts of my macula can
> actually see well enough to read. So, I bounce my head as I read and only
> pick up a few in a visual capture.
>
> My visual acuity is 20/80. So 400% is nice. I do move my head a few times
> to read a line. I compensate with a little narrower reading line (increased
> margins) and scroll vertically a little more. Overall, I do a lot less
> thinking about scrolling and more thinking about the content.
>
> Wayne
>
> On Mon, May 28, 2018 at 1:20 PM Shawn Henry <shawn@w3.org> wrote:
>
>> Hi LVTF folks,
>>
>> Generally at what acuity -- 20/??? -- would a person be able to read well
>> at 400% zoom, but not under 400% zoom?
>> (I know "It depends." on a whole bunch of factors! I'm wanting a
>> reasonable number *generally*.)
>>
>> Currently I have 20/500. I'd like more perspectives.
>>
>> Context: The persona quote here:
>> <https://w3c.github.io/wai-intro-wcag/standards-
>> guidelines/wcag/new-in-21/#1410-reflow-aa>
>> says:
>> [[
>> Problem: "It's nearly impossible to read text if I have to scroll right
>> and left to read each line. It's disorienting and I lose my place. It makes
>> it hard to understand what I'm reading."
>> Works well: "I increase the text size 400% and it reflowed within the
>> width of the window. I can read it easily without scrolling back and forth."
>> ]]
>>
>> It's attributed to: "Parent with low vision – 20/500"
>>
>> Thanks for input.
>>
>> Best,
>> ~Shawn
>>
>>