The Impact of Vision Impairment on Vision-Specific Quality of Life in Germany

Finger, Robert P.; Fenwick, Eva; Marella, Manjula; Dirani, Mohammed; Holz, Frank G.; Chiang, Peggy Pei-Chia; Lamoureux, Ecosse L.

doi:10.1167/iovs.10-7127

Cited by 93 publications

(94 citation statements)

References 38 publications

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“…The modified VF-9 scale that fits the Rasch model provides more accurate scoring of visual functioning compared with other studies that have used mean or summary visual functioning scores 22 23. Rasch analysis is increasingly considered the gold standard of modern scale validation, and can be used to look at the impact of cataract surgery on visual functioning 1. On the other hand, our study population included only Singaporean Malay individuals and our study findings cannot be generalised to other populations.…”

Section: Discussionmentioning

confidence: 97%

The impact of bilateral or unilateral cataract surgery on visual functioning: when does second eye cataract surgery benefit patients?

et al. 2012

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Section: Discussionmentioning

confidence: 97%

The impact of bilateral or unilateral cataract surgery on visual functioning: when does second eye cataract surgery benefit patients?

et al. 2012

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“…Similar to the 32-item IVI, the 28-item version also was demonstrated to lack unidimensionality, albeit in a German VI population. 50 Taken together, these studies bear out that optimal functioning in another population should not be assumed. Rather, questionnaires should be revalidated in the population in which they are intended to be used.…”

Section: Discussionmentioning

confidence: 98%

Assessment of the Impact of Keratoconus on Vision-Related Quality of Life

Gothwal

Reddy

Fathima

et al. 2013

Invest. Ophthalmol. Vis. Sci.

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PURPOSE. We determined if the Impact of Vision Impairment (IVI) is a valid questionnaire to measure the vision-related quality of life (VRQoL) in keratoconus patients, and investigated if the VRQoL varied with disease severity in this sample. METHODS.We recruited 160 consecutive bilateral keratoconus patients (mean age 23.3 years, 63% male) from an Indian tertiary eye care center. Participants underwent a clinical examination and completed the IVI. Participants were divided into three groups based on the average of the steep keratometry (K) readings: mild (average Sim K < 45 diopters [D]), moderate (average Sim K 45-52 D), and severe (average Sim K > 52 D). Rasch analysis was used to validate the IVI and the VRQoL scores thus obtained were compared across the disease groups.RESULTS. The majority (63%) of patients had severe, while the remainder (37%) had moderate keratoconus. Rasch analysis demonstrated the validity of the IVI to assess VRQoL through two subscales: vision-specific functioning (VF) and emotional well-being (EWB). There was no significant difference in VF (mean change À0.16, P ¼ 0.55) and EWB scores (mean change À0.32, P ¼ 0.23) between moderate and severe keratoconus groups.CONCLUSIONS. The revised IVI subscales have interval-level measurement properties, which support their suitability to measure VRQoL in this keratoconus sample. Patients with moderate or severe keratoconus had similar, but higher VRQoL scores as assessed by the revised IVI subscales, indicating lack of impact of the disease on their VRQoL. However, this does not exclude the possibility of finding an impact in other populations.

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“…We and others have previously reported that even mild visual impairment (0.3<LogMAR<0.5) has a significant and independent impact on vision-specific functioning 41–43. Similarly, emotional well-being is affected in patients with even mild vision impairment 42. Depression is considered to result in further functional decline in this group by reducing motivation, initiative and resiliency 44–46.…”

Section: Discussionmentioning

confidence: 99%

The economic burden of visual impairment and blindness: a systematic review

et al. 2013

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ObjectivesVisual impairment and blindness (VI&B) cause a considerable and increasing economic burden in all high-income countries due to population ageing. Thus, we conducted a review of the literature to better understand all relevant costs associated with VI&B and to develop a multiperspective overview.DesignSystematic review: Two independent reviewers searched the relevant literature and assessed the studies for inclusion and exclusion criteria as well as quality.Eligibility criteria for included studiesInterventional, non-interventional and cost of illness studies, conducted prior to May 2012, investigating direct and indirect costs as well as intangible effects related to visual impairment and blindness were included.MethodsWe followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement approach to identify the relevant studies. A meta-analysis was not performed due to the variability of the reported cost categories and varying definition of visual impairment.ResultsA total of 22 studies were included. Hospitalisation and use of medical services around diagnosis and treatment at the onset of VI&B were the largest contributor to direct medical costs. The mean annual expenses per patient were found to be US$ purchasing power parities (PPP) 12 175–14 029 for moderate visual impairment, US$ PPP 13 154–16 321 for severe visual impairment and US$ PPP 14 882–24 180 for blindness, almost twofold the costs for non-blind patients. Informal care was the major contributor to other direct costs, with the time spent by caregivers increasing from 5.8 h/week (or US$ PPP 263) for persons with vision >20/32 up to 94.1 h/week (or US$ PPP 55 062) for persons with vision ≤20/250. VI&B caused considerable indirect costs due to productivity losses, premature mortality and dead-weight losses.ConclusionsVI&B cause a considerable economic burden for affected persons, their caregivers and society at large, which increases with the degree of visual impairment. This review provides insight into the distribution of costs and the economic impact of VI&B.

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The Impact of Vision Impairment on Vision-Specific Quality of Life in Germany

Abstract: Using a psychometrically valid German IVI, even mild vision impairment was independently associated with poor VRQoL. These findings reinforce the importance of early preventative and rehabilitative efforts to prevent longitudinal deterioration in vision loss.

Cited by 93 publications

References 38 publications

The impact of bilateral or unilateral cataract surgery on visual functioning: when does second eye cataract surgery benefit patients?

The impact of bilateral or unilateral cataract surgery on visual functioning: when does second eye cataract surgery benefit patients?

Assessment of the Impact of Keratoconus on Vision-Related Quality of Life

The economic burden of visual impairment and blindness: a systematic review

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