Published works by Associate Professor Konrad Pesudovs http://hdl.handle.net/2328/989 2013-06-19T22:06:25Z 2013-06-19T22:06:25Z Pesudovs, Konrad http://hdl.handle.net/2328/11176 2013-05-13T01:38:18Z 2006-01-01T00:00:00Z

Title: Patient-centered measurement in ophthalmology - a paradigm shift Authors: Pesudovs, Konrad

2006-01-01T00:00:00Z Gothwal, Vijaya Wright, Thomas Lamoureux, Ecosse L Pesudovs, Konrad http://hdl.handle.net/2328/8028 2013-05-13T02:00:38Z 2009-01-01T00:00:00Z

Title: Validity of the Adaptation to Age-related Vision Loss Scale in an Australian Cataract Population Authors: Gothwal, Vijaya; Wright, Thomas; Lamoureux, Ecosse L; Pesudovs, Konrad Abstract: Purpose: The Adaptation to Age-related Vision Loss (AVL) scale was developed to measure the adjustment of older adults who are adapting to late-life vision loss. The purpose of this study was to assess whether the AVL scale satisfies the Rasch model in a cataract population. Methods: The 24-item AVL scale (18 negatively and 6 positively coded) was mailed to 436 cataract patients for self-administration whilst they were on the waiting list for cataract surgery at the Flinders Eye Centre, Adelaide, South Australia. Rasch analysis was performed to determine whether the items were measuring a single construct (unidimensionality) as examined with fit statistics and principal components analysis (PCA) of the residuals. The ability of the scale to distinguish between the levels of adaptation of the participants (person separation) was investigated, with a value ≥ 2.0 established as the minimum acceptable. Results: The AVL scale was unable to differentiate sufficiently between participants’ levels of adaptation, indicating poor person separation. One item did not fit the construct, causing misfit. Furthermore, the five positively worded items did not appear either to measure the same construct as other items, resulting in lack of unidimensionality evidenced by PCA. Following the deletion of these items, the AVL scale was one-dimensional but a single item continued to misfit, so it had to be deleted, resulting in an 18-item AVL scale. Even so, the discriminating abilities of the scale continued to be poor. Conclusions: The AVL scale is not an appropriate measure of adaptation to vision loss in a cataract population.

2009-01-01T00:00:00Z Leat, S Gurwood, A Kergoat, H Pesudovs, Konrad Eperjesi, F http://hdl.handle.net/2328/8027 2013-05-13T02:00:32Z 2009-01-01T00:00:00Z

Title: Geriatric Vision Care – a New Look at the Old Authors: Leat, S; Gurwood, A; Kergoat, H; Pesudovs, Konrad; Eperjesi, F Abstract: World-wide, Optometry is expanding its scope of practice in many jurisdictions. The campaign to use therapeutic pharmaceutical agents (TPAs) is on-going in most countries and optometrists are increasingly becoming involved in co-managing glaucoma and the ocular complications of diabetes, interfacing with systemic and ophthalmic specialists. Optometrists continue to define their role as members of the healthcare team by serving as post-operative care specialists following refractive and cataract surgeries. In addition, Optometry continues to be a leader in pediatric eye care and pediatric eye research, including working with children with learning disabilities and children with special needs (multiple-challenges). While low vision, contact lenses and orthoptics (vision training/binocular vision) remain staples of the traditional domain, they should not be ignored at the expense of new growth. Even as we struggle, some ask, “is the time ripe for Optometry to begin to recognize its own subspecialties?” Although all optometrists graduate as primary eye care providers, as the profession expands special interest practitioners have laid claim to areas of expertise such as sports vision specialist, rehabilitation vision specialist, neurooptometric specialty and so on. Just as medicine, and then ophthalmology before us, recognized sub-disciplines, should Optometry mature along a similar path?

2009-01-01T00:00:00Z Pesudovs, Konrad Caudle, Lynda Elisabeth Rees, Guy Lamoureux, Ecosse L http://hdl.handle.net/2328/1859 2013-05-13T01:31:25Z 2008-06-01T00:00:00Z

Title: Validity of a visual impairment questionnaire in measuring cataract surgery outcomes [post print] Authors: Pesudovs, Konrad; Caudle, Lynda Elisabeth; Rees, Guy; Lamoureux, Ecosse L Abstract: PURPOSE: To test the validity of the Impact of Visual Impairment (IVI) questionnaire in a cataract population. SETTING: Flinders Eye Centre, Flinders Medical Centre, Flinders University, Adelaide, South Australia. METHODS: Cataract patients recruited from a hospital waiting list completed the IVI questionnaire. The scale was assessed for fit to the Rasch model. Unidimensionality, item and person fit to the model, response category performance, differential item functioning (whether different subgroups responded differently), and targeting of item difficulty to patient ability were assessed. RESULTS: Overall, the IVI questionnaire performed well; there were ordered thresholds, person separation reliability was 0.97, and it was free from differential item functioning. One item (worry about eyesight getting worse) misfit the model and was removed. There was evidence of multidimensionality, indicating that the overall IVI score should be discarded; however, the 3 subscales (reading and accessing information, mobility and independence, and emotional well-being) functioned well. Several items calibrated differently in cataract patients compared with low-vision patients, indicating different issues are important to each population and that there is a need for population-specific conversion algorithms. Targeting of the IVI items was biased toward more impaired patients. CONCLUSIONS: The 3 subscales of the IVI questionnaire functioned well in a cataract population. However, additional items targeting the less impaired patients, especially second-eye cataract patients, would improve measurement.

2008-06-01T00:00:00Z