• 1
    Resnikoff S, Pascolini D, Etya'ale D, et al. Global data on visual impairment in the year 2002. Bull World Health Organ 2004;82:84451.
  • 2
    Horle S, Gruner F, Kroll P. Epidemiologie diabetischer Erblindungen—eine Übersicht [Epidemiology of diabetes-induced blindness—a review. Klin Monatsbl Augenheilkd 2002;219:77784.
  • 3
    Fong DS, Aiello LP, Ferris FL 3rd, Klein R. Diabetic retinopathy. Diabetes Care 2004;27:254053.
  • 4
    Khaw PT, Shah P, Elkington AR. ABC of Eyes. London: BMJ Publishing Group, 2004.
  • 5
    Yam JC, Kwok A. Update on the treatment of diabetic retinopathy. Hong Kong Med J 2007;13:4660.
  • 6
    Ware J Jr, Kosinski M, Keller SD. A 12-item short-form health survey: construction of scales and preliminary tests of reliability and validity. Med Care 1996;34:22033.
  • 7
    Mangione CM, Lee PP, Gutierrez PR, et al. Development of the 25-item National Eye Institute Visual Function Questionnaire. Arch Ophthalmol 2001;119:10508.
  • 8
    Mitchell J, Wolffsohn JS, Woodcock A, et al. Psychometric evaluation of the MacDQoL individualised measure of the impact of macular degeneration on quality of life. Health Qual Life Outcomes 2005;3:25. doi: 10.1186/1477-7525-3-25.
  • 9
    Bradley C, Todd C, Gorton T, et al. The development of an individualized questionnaire measure of perceived impact of diabetes on quality of life: the ADDQoL. Qual Life Res 1999;8:7991.
  • 10
    Woodcock A, Plowright R, Kennedy-Martin T, et al. Development of the new Retinopathy Treatment Satisfaction Questionnaire (RetTSQ). Proceedings of Vision 2005; International Congress Series 2005;1282:3426.
  • 11
    Brose LS, Watkins J, Bradley C. Retinopathy Treatment Satisfaction Questionnaire (RetTSQ): psychometric development. 2007 International Society for Quality of Life Research meeting abstracts. Quality of Life Research supplement; A-21, Abstract #1197. Available from: 2007 [Accessed July 27, 2009].
  • 12
    Woodcock A, Bradley C, Plowright R, et al. The influence of diabetic retinopathy on quality of life: interviews to guide the design of a condition-specific, individualised questionnaire: the RetDQoL. Patient Educ Couns 2004;53:36583.
  • 13
    Bradley C, Speight J. Patient perceptions of diabetes and diabetes therapy: assessing quality of life. Diabetes Metab Res Rev 2002;18(Suppl. 3):S649.
  • 14
    Garratt AM, Schmidt L, Fitzpatrick R. Patient-assessed health outcome measures for diabetes: a structured review. Diabet Med 2002;19:111.
  • 15
    World Health Organization. International Statistical Classification of Diseases and Related Health Problems, 10th Revision. Version for 2007. Available from:[Accessed September 10, 2008].
  • 16
    Nunnally JC. Psychometric Theory. New York, NY: McGraw Hill, 1978.
  • 17
    Kline P. A Handbook of Test Construction. London: Metheun, 1993.
  • 18
    Mitchell J, Wolffsohn J, Woodcock A, et al. The MacDQoL individualized measure of the impact of macular degeneration on quality of life: reliability and responsiveness. Am J Ophthalmol 2008;146:44754.
  • 19
    Coyne KS, Margolis MK, Kennedy-Martin T, et al. The impact of diabetic retinopathy: perspectives from patient focus groups. Fam Pract 2004;21:44753.
  • 20
    Mitchell J, Bradley C. Design of an individualised measure of the impact of macular disease on quality of life (the MacDQoL). Qual Life Res 2004;13:116375.
  • 21
    Brose LS, Plowright R, Mitchell J, Bradley C. Design of an individualised measure of Quality of Life (EyeDQoL) and a measure of Treatment Satisfaction (EyeTSQ) for people with eye conditions. Vision 2008. 9th International Conference on Low Vision. 2008. 85.2.