BS ISO 24509:2019
$189.07
Ergonomics. Accessible design. A method for estimating minimum legible font size for people at any age
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 46 |
This document provides a method for estimating minimum legible font size for single characters, but not for words or sentences, in self-luminous or reflected mode, used in documents, products labels, signs, and displays for people at any age and in any viewing condition in which viewing distance, luminance and contrast are varied.
This document applies designing and evaluating legibility of single characters for people at any age who have no pathological disorders in their eyes, but not for people with visual impairments such as low vision. The application is specifically directed to, but not limited to, the cases of printed materials where fixed font size is used.
Applicability of the method to other languages is given in Annex F.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 6 | Foreword |
| 7 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Application conditions 5 Estimation of minimum legible font size |
| 11 | 6 Correction by contrast effect |
| 13 | Annex A (normative) Visual acuity data as a function of age and viewing distance |
| 15 | Annex B (normative) Luminance correction coefficient to visual acuity |
| 16 | Annex C (informative) Calculation example of the minimum legible font size at a given viewing condition |
| 18 | Annex D (informative) Minimum legible font size calculated for variable age and viewing distance at constant luminance levels for reference |
| 33 | Annex E (informative) Practical application to a group of people with a range of age and viewing conditions |
| 35 | Annex F (informative) Application to non-alphabetical characters: Korean, Chinese and Thai languages |
| 37 | Annex G (informative) Data and principle of the method for estimating minimum legible font size |
| 43 | Annex H (informative) Scaling of legibility using minimum legible font size |
| 45 | Bibliography |
