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Konrad Pesudovs is Foundation Professor and Chair of Discipline of Optometry and Vision Science at Flinders University. His main research interest is ophthalmology outcomes research; incorporating optical, visual and patient-centred measurement into the holistic measurement of outcomes in ophthalmology.
Browsing Konrad Pesudovs by Subject "Astigmatism"
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ItemAssessment of surgically induced astigmatism: toward an international standard II [comment.] [Post print](Elsevier, 1998-12) Goggin, M ; Pesudovs, KonradLetter in response to Holladay JT, Dudega DR, Koch DD "Evaluating and reporting astigmatism for individual and aggregate data", Journal of Cataract and Refractive Surgery, 1998, vol 24, 57-65
ItemAssessment of surgically induced astigmatism: toward an international standard. [comment.] [Post print](Elsevier, 1998-12) Goggin, M ; Pesudovs, KonradLetter that recommends minimun data sets to be reported in studies of the changes in astigmatism brought about by surgery.
ItemLate onset post-keratoplasty astigmatism in patients with keratoconus(BMJ Publishing Group - http://bjo.bmjjournals.com/, 2004-03) Lim, L ; Pesudovs, Konrad ; Goggin, M ; Coster, Douglas JohnAIM: 10 eyes of 10 patients are reported where progression of keratoconus in the host cornea occurred more than 10 years after penetrating keratoplasty with resultant increase in astigmatism. The technique and results of graft refractive surgery in seven eyes are presented. METHODS: The clinical features and management of these patients were retrospectively analysed. Graft refractive surgery involved an incision at the graft-host junction adjacent to the host thinning with compressive resuturing. Astigmatic changes were calculated using vector analysis. RESULTS: There were seven men and three women with a mean age of 41.2 years. The average age when undergoing penetrating keratoplasty in the affected eye was 28.4 years and the average time after penetrating keratoplasty until keratoconus appeared in the host cornea defined by host thinning was 13.5 years. The mean cylinder power before host thinning was noted was 5.07 D (SD 2.19) and the mean after host thinning was 11.0 D (2.53). The mean vector calculated disease induced astigmatism magnitude was 7.59 D (3.09). Graft refractive surgery was performed in seven eyes. The mean cylinder power before and after graft refractive surgery was 11.28 D (2.15) and 7.09 D (5.53) respectively. The surgically induced astigmatism vector magnitude was 7.36 D (4.88). CONCLUSION: Progression of keratoconus in the host cornea late after penetrating keratoplasty is characterised by a large astigmatic change where the flat axis of astigmatism passes through an area of host thinning visible on slit lamp examination. Compressive resuturing performed in the area of host thinning resulted in satisfactory reduction of astigmatism.
ItemRefractive error changes in cortical, nuclear, and posterior subcapsular cataracts(BMJ Publishing Group - http://bjo.bmjjournals.com/, 2003-08) Pesudovs, Konrad ; Elliott, David BAIMS: To determine the effect of the three main morphological types of cataract on refractive error. METHODS: Data were prospectively collected from 77 subjects (age 67 (SD 8) years) with one morphological type of cataract. 34 had cortical, 21 had nuclear, and 21 had posterior subcapsular cataract. 22 subjects with clear lenses (60 (7) years) were recruited as controls. The spherical equivalent and astigmatic vector change between spectacle correction and optimal refraction were calculated. RESULTS: The cortical cataract group showed a significant astigmatic change of 0.71 (0.67) D (mean (1 SD)) compared to the control group (0.24 (0.20) D), with 24% outside the 95% confidence limit (0.63 D). The nuclear cataract group showed a significant myopic shift of -0.38 (0.60) D compared to the control group (+0.02 (0.21) D), with 52% beyond the minus 95% confidence limit (-0.39 D). CONCLUSION: A quarter of subjects with cortical cataract showed larger changes in astigmatism than subjects with clear lenses. This is probably because of the localised refractive index changes along cortical spoke opacities within the pupillary area. The well known myopic shift of nuclear cataract was also demonstrated.