Purpose The aim of this article was to systematically review all the available ophthalmic
patient-reported outcome (PRO) instruments (questionnaires) that demonstrated interval …

Background. The purpose of the study was to develop a questionnaire that could quantify
the quality of life (QOL) of people with refractive correction by spectacles, contact lenses …

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 …

PURPOSE: To test the assumption that the National Eye Institute Visual Function
Questionnaire (NEI VFQ) measures visual functioning, assess the validity of its subscales …

Purpose.: The Ocular Surface Disease Index (OSDI) is a 12-item scale for the assessment of
symptoms related to dry eye disease and their effect on vision. Its reliability and validity have …

In this review we discuss health measurement with a focus on psychometric methods and
methodology. In particular, we examine some of the key issues currently facing the use of …

Spasticity is most commonly defined as an inappropriate, velocity dependent, increase in
muscle tonic stretch reflexes, due to the amplified reactivity of motor segments to sensory …

People with vision‐threatening diabetic retinopathy are likely to experience enhanced social
and emotional strain. Critically, those with both vision‐threatening diabetic retinopathy and …

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 …

purpose. The Activities of Daily Vision Scale (ADVS) has been extensively validated by
traditional methodology. In the current study, Rasch analysis was used to explore further the …