Thread Subject: Re: Thoughts on TEXT SIZE

From: Gregg Vanderheiden
Date: Tue, Feb 05 2008 9:40 AM

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Hi Rob,



1) RE cell ( I think you mean cell-phone?) it depends on the phone. But
they keypad is a standard shape (if 3 x 4) and easily tactilely discerned.



2) Other labels - Yes - It should have its own note.

- how about

"Note: Except for safety labels, regulatory labels and marks are not
required for product use."




Gregg
-- ------------------------------
Gregg C Vanderheiden Ph.D.






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Sent: Tuesday, February 05, 2008 9:59 AM
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Subject: Re: [teitac-committee] Thoughts on TEXT SIZE

Gregg,



A couple of questions relative to application.



Would keyboards and keypads (like on a cell) have to meet this relative to
their legends? Or would the be excluded based on the "uniquely tactily
discernible note?



For content such as regulatory labels and marks. Should there be an
exclusionary note as this content is typically available either as hard or
soft copy with the product?



Thanks,


Rob



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Vanderheiden
Sent: Tuesday, February 05, 2008 9:31 AM
To: 'TEITAC Committee'
Subject: [teitac-committee] Thoughts on TEXT SIZE



One of the outstanding provisions is Text Size





Talking with vision scientist Aries Arditi at Lighthouse International (an
organization for people with visuals disabilities) we came up with an
approach for TEITAC to consider.




TEXT SIZE


There must be at least one mode where all information that is required for
product use and is provided is set in type (or with pixel dimensions, when
converted to points) that is:

- For devices designed to be located in public places or for
devices used away from a persons workstation

o At least 12 points if text is a label and if the user can position
their face close to the label

o else at least 14 points for all other text

- For devices designed to be located at a persons workstation

o At least 10 points if text is a label and if the user can position
their face close to the label

o else at least 12 points for all other text



Note: 1 point = 1/72.27 inches (on computer displays 1/72 inch).

Note: These are minimums and it is recommended that larger fonts be used
wherever possible on any product - either by default or as an option.

Note: If other means of conveying the information in the label or
instructions exists (e.g. uniquely tactilely discernible though shape), then
the information in text is not required and the text size requirement does
not apply.





Rationale:



- The goal is to support people with low vision but those with vision
less than 20/70 would typically use an assistive device.

- 8pt type is small but acceptable type size for those with 20/20
viewing at 40 cm (15.7 in).

- For someone with 20/70 an acceptable size is roughly 28 pts at 40
cm viewing distance.

- If we assume users with low vision can move in closer (half distance
- 20 cm) to view text, 14 pt type would provide type that subtends the same
visual angle (as 28 pt at 40 cm).

- When at one's workstation it is reasonable to assume that special
reading aids (such as magnifying glass) would be available even if in the
range of 20/30 to 20/70.

- When away from one's desk, those with 20/70 vision or better would be
presumed to not usually have any magnifying devices with them. Those with
worse than 20/70 vision would be presumed to carry portable optical
magnifying devices (including special glasses) with them. So the provision
is aimed at those with low vision but not very low vision (beyond 20/70).

- These are MINUMUMS and it is recommended that larger fonts be used
wherever possible on any product - either by default or as an option.





Gregg
-- ------------------------------
Gregg C Vanderheiden Ph.D.

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