Purchase this article with an account.
R. P. Finger, U. Kleinemas, E. L. Lamoureaux, C. Owsley, H. P. N. Scholl, F. G. Holz; Adaptation and Evaluation of the German Version of the Impact of Vision Profile (IVI) and the Low Luminance Questionnaire (LLQ) in Geographic Atrophy in Age-Related Macular Degeneration. Invest. Ophthalmol. Vis. Sci. 2009;50(13):4917.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
All questionnaires were translated, back translated and culturally adapted using feedback from patients. Subsequently, the 28-item IVI and 32-item LLQ were administered to 104 patients with GA due to AMD by telephone. Diagnosis had been confirmed within the FAM-study, which is a multi-centre natural history study of GA in Germany. All interviews were conducted by the same trained interviewer. The National Eye Institute Visual Functioning Questionnaire-25 (NEI-VFQ-25) was also administered in order to determine convergent validity of the IVI and LLQ. The study adhered to the tenets of the Declaration of Helsinki and ethical approval had been obtained prior to the commencement of the study.
Mean±SD age of patients was 78±6.7 yrs (40 M, 64 F), mean±SD visual acuity of the better eye was LogMAR 0.4±0.29. Reliability was good for the overall score and subscales of the IVI (Cronbach’s alpha 0.82-0.83) and LLQ (Cronbach’s alpha 0.82-0.91), with a modest Cronbach’s alpha for the peripheral vision scale (0.42). Item-scale correlations ranged from 0.38-0.83 for the IVI and 0.48-0.93 for the LLQ. All scales of the IVI had fair to good correlations with matching subscales of the NEI-VFQ 25 (e.g. IVI scale emotional wellbeing to VFQ scale mental health; 0.48 </= r </= 0.93; p </= 0.01). Similarly, all scales of the LLQ correlated to matching scales of the NEI-VFQ 25 (0.30 </= r </= 0.81; p </= 0.04), showing good convergent validity for both questionnaires.
This PDF is available to Subscribers Only