An increase in the number of partially sighted people is one of the effects of population ageing. These people have great difficulties in gathering wayfinding information to move independently in an unfamiliar environment. Guide paths based on the luminance contrast between a strip and surrounding surfaces can be an effective device for mitigating these difficulties, but information provided by the scientific literature on guide paths cannot be usefully applied to the naturally coloured paving materials most commonly found in pedestrian urban spaces. This paper presents a simplified method for measuring the luminance contrast between a guide strip and its background using combinations of naturally coloured paving materials.
European Commission. Towards an EU Research and Innovation Policy Agenda on Nature-Based Solutions & Re-Naturing Cities, Final Report of the Horizon 2020 Expert Group on “Nature – Based Solutions in Re-Naturing Cities.” Luxembourg: European Commission, 2015.
3.
World Health Organization. World Report on Ageing and Health. Geneva: WHO, 2015.
4.
FrickKDFosterA. The magnitude and cost of global blindness: An increasing problem that can be alleviated. American Journal of Ophthalmology2003; 135: 471–477.
5.
World Health Organization. Universal Eye Health: a Global Action Plan 2014–2019, Geneva: WHO, 2013.
6.
PascoliniDMariottiSP. Global estimates of visual impairment: 2010. British Journal of Ophthalmology2012; 96: 614–618.
7.
BourneRRAStevensGAWhiteRASmithJLFlaxmanSRPriceHJonasJBKeeffeJLeasherJNaidooKPesudovsKResnikoffSTaylorHR. Causes of vision loss worldwide, 1990–2010: A systematic analysis. Lancet Global Health2013; 1: e339–e349.
8.
MitryDBunceCWormaldRBowmanR. Chilhood visual impairment in England: A rising trend. Archives of Disease in Childhood2013; 98: 378–380.
9.
StevensGAWhiteRAFlaxmanSRPriceHJonasJBKeeffeJLeasherJNaidooKPesudovsKResnikoffSTaylorHBourneRR. Global prevalence of vision impairment and blindness: Magnitude and temporal trends, 1990-2010. Ophthalmology2013; 120: 2377–2384.
10.
BourneRRAFlaxmanSRBraithwaiteTCicinelliMVDasAJonasJBKeeffeJKempenJHLeasherJLimburgHNaidooKPesudovsKResnikoffSSilvesterGATahhanNWongTYTaylorHR. Magnitude, temporal trends, and projections of the global prevalence of blindness and distance and near vision impairment: A systematic review and meta-analysis. Lancet Global Health2017; 5: e888–897.
11.
World Health Organization. International Classification of Diseases, 10th Revision. Geneva: WHO, 2016.
12.
World Health Organization. International Statistical Classification of Diseases, Injuries and Causes of Death, 10th Revision. Geneva: WHO, 1993.
13.
World Health Organization. Global Initiative for the Elimination of Avoidable Blindness: Action Plan 2006-2011, Geneva: WHO, 2007.
14.
BonfigliuoliCPinelliM. Disabilità Visiva, Trento: Erikson, 2010. (in Italian).
15.
AppleMMAppleLEBlashDLow vision. In: WelschRLBlaschBB (eds). Foundations of Orientation and Mobility, New York: American Foundation for the Blind, 1980, pp. 187–223.
16.
Cook GK. Colour contrast and lighting. In Bright KT, editor. Disability: Making Buildings Accessible, Workplacelaw Network Special Report, 3rd Edition. Cambridge: Workplacelaw Network, 2002.
17.
ParkinJSmithiesN. Accounting for the needs of blind and visually impaired people in public realm design. Journal of Urban Design2012; 1: 135–149.
18.
BarlowJMBentzenBLFranckLEnvironmental accessibility for students with vision loss. In: WienerWRWelschRLBlaschBB (eds). Foundations of Orientation and Mobility2010; 1, 3rd Edition. New York: American Foundation for the Blind, pp. 324–384.
19.
WorthN. Visual impairment in the city: Young people’s social strategies for independent mobility. Urban Studies2013; 50: 574–586.
20.
BarkerPBarrickJWilsonR. Building Sight. A Handbook of Building and Interior Design Solutions to Include the Needs of Visually Impaired People, London: HMSO and RNIB, 1995.
21.
BrightKTEggerV. Using visual contrast for effective, inclusive environments. Information Design Journal2008; 16: 178–189.
22.
BaraccoL. Barriere Percettive e Progettazione Inclusiva, Trento: Erikson, 2016. (in Italian).
23.
International Organisation for Standardisation. ISO 23599:2012. Assistive Products for Blind and Vision-Impaired Persons – Tactile Walking Surface Indicators. Geneva: ISO, 2012.
24.
LaurìaA. Tactile pavings and urban places of cultural interest: A study on detectability of contrasting walking surface materials. Journal of Urban Technology2017; 24: 3–33.
25.
British Standards Institution. BS 8300-1:2018. Design of an Accessible and Inclusive Built Environment, Part 1: External Environment – Code of Practice. London: British Standards Institution, 2018.
26.
British Standards Institution. BS 8300-2:2018. Design of an Accessible and Inclusive Built Environment, Part 2: Buildings – Code of Practice. London: British Standards Institution, 2018.
27.
Bright KT, Cook GK, Harris J. Project rainbow – Colour and contrast design guidance. Access by Design. London: Centre of Accessible Environments, 1997.
28.
Cook GK, Bright KT. Project Rainbow: A Research Project to Provide Colour and Contrast Design Guidance for Internal Built Environments. London: Chartered Institute of Building Occasional Paper, 1999.
29.
YebraAGarcíaJANievesJLRomeroJ. Chromatic discrimination in relation to luminance level. Color Research and Application2001; 26: 123–131.
30.
American Society for Testing and Materials. ASTM C609–07:2014. Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences between Pieces of Ceramic Tile. Philadelphia, PA: ASTM, 2014.
31.
British Standards Institution. BS 8493:2008 +A1:2010. Light Reflectance Value (LRV) of a Surface. Method of Test. London: BSI, 2008.
32.
International Organisation for Standardisation. ISO 10545-3:1997. Ceramic Tiles. Determination of Water Absorption, Apparent Porosity, Apparent Relative Density and Bulk Density. Geneva: ISO, 1997.
33.
Chiarini E, Graziani P, Laurìa A, Von Prondzinski S. Progettare per l’autonomia. La mobilità per i ciechi e gli ipovedenti. Special issue of “Il Corriere dei Ciechi,” 55, 2000. (in Italian).
FotiosSUttleyJ. Illuminance required to detect a pavement obstacle of critical size. Lighting Research and Technology2018; 50: 390–404.
36.
SwitkesECrognaleMA. Comparison of color and luminance contrast: apples versus oranges?Vision Research1999; 39: 1823–1831.
37.
O’DonellBMColomboEMBoycePR. Colour information improves relative visual performance. Lighting Research and Technology2011; 43: 423–443.
38.
ICI plc. A Design Guide for the Use of Colour and Contrast to Improve the Build Environment for Visually Impaired People. London: RNIB/GDBA Joint Mobility Unit and ICI plc, 1997.
39.
MitaniSYoshidaTKobayashiSFujisawaSSuedaOTauchiM. Study on illuminance dependency of color identification characteristics for persons with low visual capacity. Assistive Technology Research Series2009; 25: 468–472.
40.
MitaniSYoshidaTKobayashiSFujisawaSSuedaOTauchiM. Study on background illuminance and color conspicuity characteristics for persons with low visual capacity. Assistive Technology Research Series2009; 25: 473–477.
41.
Commission Internationale de l’Eclairage. CIE 013.3-1995. Method of Measuring and Specifying Colour Rendering Properties of Light Sources. Vienna: CIE, 1995.
42.
Illuminating Engineering Society of North America. Technical Memorandum TM-30-15. IES Method for Evaluating Light Source Color Rendition. New York: IES, 2015.
43.
International Organisation for Standardisation. ISO 3864-1:2011. Graphical Symbols – Safety Colours and Safety Signs – Part 1: Design Principles for Safety Signs and Safety Marking. Geneva: ISO, 2011.
44.
Bundesministerium für Gesundheit. Handbuch für Planer und Praktiker. Verbesserung von Visuellen Informationen im Offentlichen Raum. Bad Homburg vor der Höhe: Fach Media Service, 1996. (in German).
ShapleyRMKaplanEPurpuraKPContrast sensitivity and light adaptation in photoreceptors or in the retinal network. In: ShapleyRLamDMK (eds). Contrast Sensitivity, Cambridge, MA: MIT Press, 1993, pp. 103–116.
47.
LindnerHSchmolkeD. Zur subjektiven Bestimmung von Helligkeitskontrasten. Der Elektropraktiker1976; 30: 170–174.
International Organisation for Standardisation. ISO 21542:2011. Building Construction – Accessibility and Usability of the Built Environment. Geneva: ISO, 2011.
50.
Bundesministerium für Gesundheit. Orientierungshilfen für Sehbehinderte im öffentlichen Bereich durch Verbesserung der visuellen Kontraste. Abschlußbericht für das. Darmstadt: Technische Hochschule Darmstadt, 1995. (in German).
51.
Kremkow J, Jin J, Komban SJ, Wang Y, Lashgari R, Li X, Jansen M, Zaidi Q, Alonso J-M. Neuronal nonlinearity explains greater visual spatial resolution for darks than lights. Proceedings of the National Academy of Sciences 2014; 111: 3170–3175.
52.
Von Prondzinsky S. Il pedone con minorazione visive e la segnaletica sul piano di calpestio. In Felli P, Laurìa A, editors, Comunicatività ambientale e pavimentazioni. La segnaletica sul piano di calpestio. Pisa: Edizioni ETS, 2004: 105–115. (in Italian).
53.
Bundesministerium für Verkehr, Bau- und Wohnungswesen. Bürgerfreundliche und behindertengerechte Gestaltung des Straßenraums, 2nd Edition. Frankfurt am Main: Fach Media Service, 2000. (in German).
54.
FelliPLaurìaABacchettiA. Comunicatività ambientale e pavimentazioni. La segnaletica sul piano di calpestio, Pisa: Edizioni ETS, pp. 2004–2004. (in Italian).
55.
Ohno H, Suzuki A, Akiu N. Measuring methods of luminance contrast between tactile walking surface indicators and their surrounding or adjacent surfaces at railway stations. Quarterly Report of Railway Technical Research Institute (RTRI) 2017; 58: 145–152.
SecchiSLaurìaACellaiG. Acoustic wayfinding: A method to measure the acoustic contrast of different paving materials for blind people. Applied Ergonomics2017; 58: 435–445.
58.
Payne AP. Understanding change in place: Spatial knowledge acquired by visually impaired users through change in footpath materials. Dissertation, University of Michigan, Ann Arbor, MI, 2009. Retrieved 9 July 2018, from http://repository.lib.ncsu.edu/ir/bitstream/1840.16/5024/1/etd.pdf.
