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Wolffsohn JS, Jackson J, Hunt OA, et al. An enhanced functional ability questionnaire (faVIQ) to measure the impact of rehabilitation services on the visually impaired. Int J Ophthalmol. 2014;7(1):77-85doi: 10.3980/j.issn.2222-3959.2014.01.14.
Wolffsohn, J. S., Jackson, J., Hunt, O. A., Cottriall, C., Lindsay, J., Gilmour, R., Sinclair, A., & Harper, R. (2014). An enhanced functional ability questionnaire (faVIQ) to measure the impact of rehabilitation services on the visually impaired. International journal of ophthalmology, 7(1), 77-85. https://doi.org/10.3980/j.issn.2222-3959.2014.01.14
Wolffsohn, James Stuart, et al. "An enhanced functional ability questionnaire (faVIQ) to measure the impact of rehabilitation services on the visually impaired." International journal of ophthalmology vol. 7,1 (2014): 77-85. doi: https://doi.org/10.3980/j.issn.2222-3959.2014.01.14
Wolffsohn JS, Jackson J, Hunt OA, Cottriall C, Lindsay J, Gilmour R, Sinclair A, Harper R. An enhanced functional ability questionnaire (faVIQ) to measure the impact of rehabilitation services on the visually impaired. Int J Ophthalmol. 2014 Feb 18;7(1):77-85. doi: 10.3980/j.issn.2222-3959.2014.01.14. eCollection 2014. PMID: 24634868; PMCID: PMC3949463.
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Int J Ophthalmol. 2014 Feb 18;7(1):77-85. doi: 10.3980/j.issn.2222-3959.2014.01.14. eCollection 2014.

An enhanced functional ability questionnaire (faVIQ) to measure the impact of rehabilitation services on the visually impaired.

International journal of ophthalmology

James Stuart Wolffsohn, Jonathan Jackson, Olivia Anne Hunt, Charles Cottriall, Jennifer Lindsay, Richard Gilmour, Anne Sinclair, Robert Harper

Affiliations

  1. Aston University, Life and Health Sciences, Ophthalmic Research Group, Birmingham, B4 7ET, UK.
  2. Australian College of Optometry, Melbourne 3053, Australia ; Royal Victoria Hospital, Belfast BT12 6BA, UK.
  3. Oxford Eye Hospital, Oxford OX3 9DU, UK.
  4. Royal Victoria Hospital, Belfast BT12 6BA, UK.
  5. Altnagelvin Area Hospital, Londonderry BT47 6SB, UK.
  6. Low Vision Clinic, Fife Low Vision Centre for the Blind, Fife KY2 5EF, UK.
  7. Manchester Royal Eye Hospital and Manchester Academic and Health Science Centre, Central Manchester University Hospitals NHS Foundation Trust, Greater Manchester M13 9WL, UK.

PMID: 24634868 PMCID: PMC3949463 DOI: 10.3980/j.issn.2222-3959.2014.01.14

Abstract

AIM: To develop a short, enhanced functional ability Quality of Vision (faVIQ) instrument based on previous questionnaires employing comprehensive modern statistical techniques to ensure the use of an appropriate response scale, items and scoring of the visual related difficulties experienced by patients with visual impairment.

METHODS: Items in current quality-of-life questionnaires for the visually impaired were refined by a multi-professional group and visually impaired focus groups. The resulting 76 items were completed by 293 visually impaired patients with stable vision on two occasions separated by a month. The faVIQ scores of 75 patients with no ocular pathology were compared to 75 age and gender matched patients with visual impairment.

RESULTS: Rasch analysis reduced the faVIQ items to 27. Correlation to standard visual metrics was moderate (r=0.32-0.46) and to the NEI-VFQ was 0.48. The faVIQ was able to clearly discriminate between age and gender matched populations with no ocular pathology and visual impairment with an index of 0.983 and 95% sensitivity and 95% specificity using a cut off of 29.

CONCLUSION: The faVIQ allows sensitive assessment of quality-of-life in the visually impaired and should support studies which evaluate the effectiveness of low vision rehabilitation services.

Keywords: functional ability; low vision; quality of life; sensitivity; specificity; visual impairment

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