Jb. Hassell et al., A measure of handicap for low vision rehabilitation: the impact of vision impairment profile, CLIN EXP OP, 28(3), 2000, pp. 156-161
This study aims to further develop the Impact of Vision Impairment (IVI) pr
ofile into a practical, valid instrument for use in low vision rehabilitati
on. The IVI item pool was derived from focus groups of people with impaired
vision, relevant content of existing quality of life questionnaires, and t
he administration of two trial versions. The second trial version of IVI wa
s administered to 256 people who were vision impaired. Items were deleted i
f they were of little or no concern or were unable to be performed by most
people, had moderate to high inter-item correlation, or did not contribute
to a factor in the factor analysis. Two items were deleted due to floor and
ceiling effects, 11 due to moderate to high inter-item correlation r great
er than or equal to 0.6. None were removed as a result of factor analysis.
The first three factors explained 59% of the variance. This reduced version
of the IVI, a tool able to determine rehabilitation needs for people who a
re vision impaired, will now undergo its final validation procedures.