Re: lvtf-ACTION-78: User settings research...

Hmm, seems inconclusive. Given the nature of contrast and low vision,
perhaps we can justify 4.5 to 1 as a baseline for everything. It would be
interesting to see in the wild if developers how mich apply or use the
lower contrast ratio for large text.

On Sep 5, 2016 1:58 PM, "Wayne Dick" <wayneedick@gmail.com> wrote:

> Survey of Contrast Research
>
> Arditi and Faye [2004] performed the latest research on the decreasing
> relationship between font size and the level of contrast. Rubin and Legge
> (1989) demonstrated the need for a higher contrast threshold for people
> with low vision (reduced visual acuity). The discussion of contrast in
> Understanding SC. 1.4.3 is extremely good, except that the relationship is
> not as linear as implied by the presentation. Still Ariditi and Faye
> established that as size goes up the contrast threshold goes down. The
> reference to font-size guidelines from the American Printing House for the
> Blind were developed in a context of print material.  It is less relevant
> in an era of digital documents. Arditi,
> Arditi, A. and Faye, E. (2004). Monocular and binocular letter contrast
> sensitivity and letter acuity in a diverse ophthalmologic practice.
> Supplement to Optometry and Vision Science, 81 (12S), 287.
>
> Rubin GS1, Legge GE., Psychophysics of reading. VI--The role of contrast
> in low vision.,  Vision Research, 1989; 29(1):79-91.
>
> APH Guidelines for Print Document Design, http://www.aph.org/research/
> design-guidelines/
>
> Note: Do we need more surveys?
>
> On Thu, Aug 25, 2016 at 8:58 AM, Low Vision Accessibility Task Force Issue
> Tracker <sysbot+tracker@w3.org> wrote:
>
>> lvtf-ACTION-78: User settings research...
>>
>> http://www.w3.org/WAI/GL/low-vision-a11y-tf/track/actions/78
>>
>> Assigned to: Wayne Dick
>>
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