OBJECTIVE: To develop and evaluate the acceptability, reliability, validity, and responsiveness of the Indian vision function questionnaire (IND-VFQ). METHODS: Problem statements from previous qualitative studies were reduced to a 45 item interviewer administered questionnaire representing three a priori domains (general functioning, psychosocial impact, and visual symptoms) which was evaluated in patients with cataract (n = 420), glaucoma (n = 120), diabetic retinopathy, or age related macular degeneration (n = 120) and normal controls (n = 120). Standard methods were used for item reduction and to evaluate psychometric properties. RESULTS: Psychometric item reduction produced a 33 item questionnaire. Psychometric evaluation showed that two of the three scales (psychosocial impact and visual symptoms) had good acceptability, and that all three scales showed high internal consistency (alpha >0.80; item-total correlations 0.54-0.86) and test-retest reliability (>0.89). All three scales showed moderate evidence of convergent and discriminant validity. Responsiveness, assessed in cataract patients (n = 120) before and after surgery, was good for all three scales (effect sizes >1). CONCLUSIONS: The IND-VFQ33 is a psychometrically sound measure of vision function addressing a gap in patient defined measures of vision function developed in populations living in low income countries.
OBJECTIVE: To develop and evaluate the acceptability, reliability, validity, and responsiveness of the Indian vision function questionnaire (IND-VFQ). METHODS: Problem statements from previous qualitative studies were reduced to a 45 item interviewer administered questionnaire representing three a priori domains (general functioning, psychosocial impact, and visual symptoms) which was evaluated in patients with cataract (n = 420), glaucoma (n = 120), diabetic retinopathy, or age related macular degeneration (n = 120) and normal controls (n = 120). Standard methods were used for item reduction and to evaluate psychometric properties. RESULTS: Psychometric item reduction produced a 33 item questionnaire. Psychometric evaluation showed that two of the three scales (psychosocial impact and visual symptoms) had good acceptability, and that all three scales showed high internal consistency (alpha >0.80; item-total correlations 0.54-0.86) and test-retest reliability (>0.89). All three scales showed moderate evidence of convergent and discriminant validity. Responsiveness, assessed in cataractpatients (n = 120) before and after surgery, was good for all three scales (effect sizes >1). CONCLUSIONS: The IND-VFQ33 is a psychometrically sound measure of vision function addressing a gap in patient defined measures of vision function developed in populations living in low income countries.
Authors: Neil Aaronson; Jordi Alonso; Audrey Burnam; Kathleen N Lohr; Donald L Patrick; Edward Perrin; Ruth E Stein Journal: Qual Life Res Date: 2002-05 Impact factor: 4.147
Authors: Mark J Atkinson; Steven Tally; Chris W Heichel; Igor Kozak; Jennifer Leich; Ashley Levack Journal: Qual Life Res Date: 2012-03-21 Impact factor: 4.147
Authors: Chelsea L Reighard; Manju R Pillai; Sujani Shroff; George L Spaeth; Stephen G Schilling; Sheryl S Wizov; Joshua D Stein; Alan L Robin; Vidya Raja; Joshua R Ehrlich Journal: Ophthalmol Glaucoma Date: 2019-06-18
Authors: Katherine M Niemeyer; John A Gonzales; Sivakumar R Rathinam; Manohar Babu; Radhika Thundikandy; Anuradha Kanakath; Travis C Porco; Erica N Browne; Maya M Rao; Nisha R Acharya Journal: Am J Ophthalmol Date: 2017-04-14 Impact factor: 5.258
Authors: Jennifer Rose-Nussbaumer; N Venkatesh Prajna; K Tiruvengada Krishnan; Jeena Mascarenhas; Revathi Rajaraman; Muthiah Srinivasan; Anita Raghavan; Catherine E Oldenburg; Kieran S O'Brien; Kathryn J Ray; Stephen D McLeod; Travis C Porco; Thomas M Lietman; Nisha R Acharya; Jeremy D Keenan Journal: JAMA Ophthalmol Date: 2015-06 Impact factor: 7.389
Authors: Jennifer Rose-Nussbaumer; N Venkatesh Prajna; Tiruvengada Krishnan; Jeena Mascarenhas; Revathi Rajaraman; Muthiah Srinivasan; Anita Raghavan; Catherine E Oldenburg; Kieran S O'Brien; Kathryn J Ray; Travis C Porco; Stephen D McLeod; Nisha R Acharya; Jeremy D Keenan; Thomas M Lietman Journal: Br J Ophthalmol Date: 2015-11-03 Impact factor: 4.638
Authors: Jemaima Che Hamzah; Jennifer M Burr; Craig R Ramsay; Augusto Azuara-Blanco; Maria Prior Journal: Qual Life Res Date: 2011-01-04 Impact factor: 4.147