Test-retest reliability of the Impact of Vision Impairment-Very Low Vision questionnaire: retina
Most patient-reported outcome measures used in ophthalmology show floor effects in a very low vision population, which limits their use in vision restoration trials. The Impact of Vision Impairment-Very Low Vision scale (IVI-VLV) was developed to specifically target a very low vision population, but...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
June 12, 2023
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| In: |
Translational Vision Science & Technology
Year: 2023, Volume: 12, Issue: 6, Pages: 1-7 |
| ISSN: | 2164-2591 |
| DOI: | 10.1167/tvst.12.6.6 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1167/tvst.12.6.6 Verlag, kostenfrei, Volltext: https://tvst.arvojournals.org/article.aspx?articleid=2785692 
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| Author Notes: | David J. Fink, Jan H. Terheyden, Susanne G. Pondorfer, Frank G. Holz, and Robert P. Finger |
| Summary: | Most patient-reported outcome measures used in ophthalmology show floor effects in a very low vision population, which limits their use in vision restoration trials. The Impact of Vision Impairment-Very Low Vision scale (IVI-VLV) was developed to specifically target a very low vision population, but its test-retest reliability has not been investigated yet. The German version of the IVI-VLV was administered twice to patients with stable disease of a low vision clinic. Test and retest person measures of the IVI-VLV subscales were obtained from Rasch analysis. Test-retest reliability was investigated by intraclass correlation coefficients and Bland-Altman plots. We included 134 patients (72 women, 62 men) at a mean age of 62 ± 15 years. The intraclass correlation coefficients were 0.920 (95% confidence interval, 0.888-0.944) for the activities of daily living and mobility subscale of the IVI-VLV and 0.929 (95% confidence interval, 0.899-0.949) for the emotional well-being subscale. Bland-Altman plots did not indicate any systematic bias. In linear regression analysis, test-retest differences were not significantly associated with visual acuity or administration interval. Both subscales of the IVI-VLV showed excellent repeatability independent of visual acuity and length of repeat interval. Further validation steps including an assessment of the patient-reported outcome measure's responsiveness are required for use in vision restoration trials. The results support repeated use of the IVI-VLV as a patient-reported end point in future studies in very low and ultralow vision populations. |
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| Item Description: | Gesehen am 07.10.2024 |
| Physical Description: | Online Resource |
| ISSN: | 2164-2591 |
| DOI: | 10.1167/tvst.12.6.6 |