Publications by authors named "Jennifer B Hassell"
Objective: To investigate the effectiveness of a low vision self-management programme (LVSMP) in older adults.
Methods: Participants (n=153) were existing clients of a national low vision rehabilitation organisation randomly allocated to usual services (n=60) or usual services plus LVSMP (n=93). The LVSMP was an 8-week group programme facilitated by low vision counsellors.
Purpose: To assess and re-engineer the Vision Core Measure 1 (VCM1) questionnaire in low vision (LV) and cataract participants using Rasch analysis.
Methods: 295 participants drawn from a low vision clinic and 181 from a cataract surgery waiting list completed the 10-item VCM1. Unidimensionality, item fit to the model, response category performance, differential item functioning (DIF) and targeting of items to patients were assessed.
Purpose: To evaluate the effectiveness of a multidisciplinary low-vision rehabilitation program on quality of life evaluated by the Impact of Vision Impairment (IVI) instrument.
Methods: First-time referrals to low-vision clinics were assessed before and after rehabilitation (3-6 months). Rasch analysis was used to estimate the three IVI subscale and overall values on an interval scale.
Purpose: To assess and validate the subscale structure of the 28-item Impact of Visual Impairment (IVI) Scale by using confirmatory factor analysis (CFA) and Rasch analysis for use as an outcome measure.
Methods: Three hundred nineteen participants completed the IVI questionnaire, and the responses then were subjected to Rasch analysis by RUMM2020 software. With the person estimates for each item, CFA was used to assess two hypothesized structures: three-and four-factor models.
Purpose: To explore the psychometric properties of the Impact of Vision Impairment scale (IVI) by using Rasch analysis.
Methods: Three hundred fourteen first-time referrals to low-vision clinics completed the 32-item IVI. The data were Rasch-analyzed with a partial credit model using RUMM2020 software (RUMM Laboratory, Perth, WA, Australia).
Purpose: To investigate the determinants of participation in daily activities in people with impaired vision using the Impact of Vision Impairment (IVI) instrument.
Design: Cross-sectional study.
Methods: We recruited 319 participants with no vision rehabilitation history, distance visual acuity (VA) <6/12 (better eye), the ability to converse in English, and 18 years or older.
Objective: To determine the restriction of participation in daily activities of people with diabetic retinopathy using the Impact of Vision Impairment questionnaire.
Methods: Individuals with diabetic retinopathy and a visual acuity (VA) worse than 20/40 or 6/12 in the better eye were eligible. Participants answered demographic questions and had VA information abstracted from medical records.
Purpose: To describe the psychometric characteristics of the Impact of Vision Impairment (IVI) Profile and evaluate its validity and reliability over time and between different forms of administration.
Methods: The IVI is a 32-item questionnaire developed to measure the impact of vision impairment on restriction of participation in daily activities in five domains of functioning. Each item is rated on a six-level scale from "no difficulty" to "can't do because of vision.