Assessment of the impact of vision impairment.

摘要: Purpose To describe the psychometric characteristics of Impact Vision Impairment (IVI) Profile and evaluate its validity reliability over time between different forms administration. Methods The IVI is a 32-item questionnaire developed to measure impact vision impairment on restriction participation in daily activities five domains functioning. Each item rated six-level scale from "no difficulty" "can't do because vision." was administered by trained interviewers 115 people with impaired (visual acuity less than 6/12 or visual field deficit) who attended Royal Victorian Eye Ear Hospital, rehabilitation agency, self-help group for vision. Data were also collected demographic participants, cause impairment, distance near General health status assessed Short Form-12 (SF-12) Physical Mental Health Summary Scales. A subset participants completed twice, either 1 2 weeks apart administration (different self). Results Internal consistency total domain average scores high (alpha = 0.80-0.96) sequential elimination items did not affect consistency. Total correlated moderately both (r 0.21-0.31) but correlate physical general comorbidity. most closely global measures 0.44-0.82). Principal-components analysis confirmed that all contribute one underlying theme tended confirm two domains: emotional reaction loss mobility. first three components explained 43%, 8%, 6% variation data. Guttman split-half coefficients ranged 0.73 0.94 scores. Mean absolute difference administrations step score. Conclusions This study provides support has sufficient internal construct effect activities. demonstrates acceptable short period yields consistent results interviewers. can be self-administered assurance will comparable those would have been obtained interviewer. Therefore, use assessment needs Its stability indicates it potential outcomes intervention.