36 CFR Part 1194 - Proposed Information and Communication Technology (ICT) Standards and Guidelines NPRM - Preamble

302.2 With Limited Vision (Section-by-Section Analysis)

This section proposes to revise the functional performance criterion for users with limited vision so that, where a visual mode of operation is provided, one mode of operation that magnifies, one mode that reduces the field of vision, and one mode that allows user control of contrast would be required. This provision contains significant changes from the functional performance criteria in the existing 508 Standards §1194.31(b) and existing 255 Guidelines §1193.41(b). Existing 508 Standards §1194.31(b) requires at least one mode of operation and information retrieval that does not require visual acuity greater than 20/70 to be provided in both audio and enlarged print output working together or independently. Existing 255 Guidelines §1193.41(b) is similar, except that it defines users with limited vision as users possessing visual acuity that ranges between 20/70 and 20/200. For a further discussion of the history of these proposed changes, see Section IV.E.6 (Rulemaking History – 2010 and 2011 ANPRMs: Significant Issues – Modifications to the Functional Performance Criteria for Limited Vision).

Question 17. Some commenters raised concerns with proposed 302.2 With Limited Vision. They recommended that the Board establish thresholds for how much magnification, reduction, or contrast is sufficient to meet the provision. Should proposed 302.2 be more specific, and if so, what should the thresholds be? Please cite a scientific basis for threshold recommendations.