6 results on '"Briesen, Sebastian"'
Search Results
2. Validity of first post-operative day automated refraction following dense cataract extraction.
- Author
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Briesen S, Ng EY, and Roberts H
- Subjects
- Aged, Female, Follow-Up Studies, Humans, Kenya, Male, Middle Aged, Phacoemulsification rehabilitation, Postoperative Care methods, Postoperative Complications diagnosis, Prospective Studies, Recovery of Function, Reproducibility of Results, Rural Health Services standards, Time Factors, Cataract Extraction rehabilitation, Postoperative Care standards, Refraction, Ocular, Refractive Errors diagnosis, Visual Acuity
- Abstract
Background: The aim of this study was to assess the refractive stability and validity of automated refraction obtained at day one after surgery for dense cataracts in a developing country setting, where patient follow-up is often erratic., Methods: In a prospective study in rural Kenya, we compared automated refraction and visual acuity (VA) after manual small incision cataract surgery (SICS) and phacoemulsification cataract surgery (Phaco) at day one with autorefraction and subjective refraction obtained at a later visit., Results: Ninety eyes of 83 patients fulfilled the ultimate inclusion criteria (21 SICS eyes and 69 Phaco eyes). The correlation between refraction at day one and at a later follow-up was moderately good for both SICS and Phaco (R1 = 0.61 and R2 = 0.58). Spherical equivalent (SE) values measured at day one were within one dioptre of those obtained later in 68 eyes (72 per cent); (SICS: 67 per cent; Phaco: 74 per cent) and within two dioptres in 83 eyes (92 per cent); (SICS: 86 per cent; Phaco: 94 per cent). At post-operative days 14, 28 and more than 42 for SICS and Phaco eyes, the mean SE was 0.58 and 0.48, 0.55 and 0.19, and 0.9 and 0.31 more hypermetropic than the mean SE of post-operative day one, respectively. First-day accuracy was higher in eyes with better pre-operative VA, softer cataracts and lower post-operative prediction error. The surgical technique (SICS versus Phaco) had no influence on first-day accuracy in our set-up., Conclusion: Refractive data from the early post-operative period can provide useful data for qualitative control and monitoring of post-operative refractive outcomes in a setup, where 'better' data are often not available; however, its accuracy is limited and, ultimately, there is no alternative to good follow up of operated patients., (© 2011 The Authors. Clinical and Experimental Optometry © 2011 Optometrists Association Australia.)
- Published
- 2011
- Full Text
- View/download PDF
3. Usefulness of short-term data for evaluating cataract surgery outcomes.
- Author
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Briesen S, Handzel DM, Remmel R, and Dardenne C
- Subjects
- Databases, Factual, Germany, Humans, Ophthalmology statistics & numerical data, Practice Guidelines as Topic, Quality Control, Registries, Societies, Medical, Surgicenters statistics & numerical data, Outcome and Process Assessment, Health Care statistics & numerical data, Phacoemulsification statistics & numerical data, Refraction, Ocular physiology, Visual Acuity physiology
- Published
- 2011
- Full Text
- View/download PDF
4. The importance of biometry to cataract outcomes in a surgical unit in Africa.
- Author
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Briesen S, Roberts H, and Lewallen S
- Subjects
- Aged, Female, Humans, Kenya epidemiology, Lenses, Intraocular, Male, Middle Aged, Prospective Studies, Refractive Errors epidemiology, Rural Population, Treatment Outcome, Biometry methods, Cataract physiopathology, Cataract Extraction, Lens Implantation, Intraocular, Pseudophakia physiopathology, Refraction, Ocular physiology, Visual Acuity physiology
- Abstract
Purpose: To determine how much difference biometry makes to refractive outcomes in a population in Sub-Saharan Africa compared to using standard-power intraocular lenses (IOLs)., Methods: In a secondary eye-clinic in Kenya, IOL-powers in half diopters (D) were implanted according to biometry prediction in patients undergoing routine cataract surgery with small-incision techniques. A model was generated to predict refractive outcomes if standard-IOLs had been used., Results: Three-hundred-twenty-five eyes of 290 patients were operated on; 232 (71%) using phacoemulsification, the remainder using manual small-incision cataract surgery. Two-hundred-sixty-seven eyes (82.2%) achieved corrected visual acuity (VA) >or=6/18 and 202 eyes (62%) uncorrected VA >or=6/18. Pre-existing comorbidity was the single most common reason for a worse postoperative VA. Restricting analysis to one eye per patient, with biometry 71.1% had a good refractive outcome (defined as +1 to -1.5 D spherical equivalent), 27.6% became more than -1.5 D myopic and 1.3% more than +1.00 D hyperopic. With standard-power-IOLs 57.3% would have had a good refractive outcome and 16% would have become >1 D hyperopic. Using the post-op refractive data for A-constant optimization could potentially further increase good refractive outcomes to over 80%., Conclusion: Biometry in combination with small-incision techniques improves refractive outcomes and decreases undesired postoperative hyperopia. Assuming good surgical skills, better outcomes with biometry justify cataract operation at an earlier stage, thereby reducing intra- and postoperative complications and avoiding years of visual disability.
- Published
- 2010
- Full Text
- View/download PDF
5. Are blind people more likely to accept free cataract surgery? A study of vision-related quality of life and visual acuity in Kenya.
- Author
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Briesen S, Roberts H, Ilako D, Karimurio J, and Courtright P
- Subjects
- Aged, Aged, 80 and over, Blindness economics, Blindness physiopathology, Blindness psychology, Cataract economics, Cataract physiopathology, Cataract psychology, Cost of Illness, Female, Health Status, Humans, Kenya, Male, Middle Aged, Surveys and Questionnaires, Cataract Extraction, Fees and Charges, Patient Acceptance of Health Care psychology, Quality of Life psychology, Visual Acuity physiology, Visually Impaired Persons psychology
- Abstract
Purpose: To determine possible differences in visual acuity, socio-demographic factors and vision-related Quality of Life (QoL) between people accepting and people refusing sponsored cataract surgery., Methods: Three hundred and fifty seven local residents with visually impairing cataract, presenting at screening sites in Kwale District, Kenya were clinically assessed and interviewed. The World Health Organization (WHO) QoL-questionnaire WHO/Prevention of Blindness and Deafness Visual Functioning Questionnaire 20 (PBD-VFQ20) was used to determine the vision-related QoL. A standardized questionnaire asked for socio-demographic data and prior cataract surgery in one eye. After interview, patients were offered free surgery. Primary outcome was the mean QoL-score between acceptors and non-acceptors. Secondary outcomes were visual acuity and socio-demographic factors and their contribution to QoL-scores and the decision on acceptance or refusal., Results: Fifty nine people (16.5%) refused and 298 accepted cataract surgery. Vision-related QoL was poorer in people accepting than in those refusing (mean score 51.54 and 43.12 respectively). People with poor visual acuity were only slightly more likely to accept surgery than people with better vision; the strongest predictors of acceptance were the QoL-score and gender. Men were twice as likely to accept compared to women. Of people who accepted surgery, 73.8% had best eye vision of 20/200 or better., Conclusion: In this population, visual acuity was of limited use to predict a person's decision to accept or refuse cataract surgery. QoL-scores provide further insight into which individuals will agree to surgery and it might be useful to adapt the QoL-questions for field use. Gender inequities remain a matter of concern with men being more likely to get sight-restoring surgery.
- Published
- 2010
- Full Text
- View/download PDF
6. The Impact of Visual Impairment on Health-related Quality of Life in Rural Africa.
- Author
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Briesen, Sebastian, Roberts, Helen, and Finger, Robert P.
- Subjects
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VISION disorders , *VISUAL acuity , *LITERACY research , *SOCIOECONOMIC factors , *COMORBIDITY , *QUALITY of life measurement - Abstract
Purpose: To assess the impact of visual impairment (VI) on utility values in Sub-Saharan Africa and compare findings with other studies from low- and high-income countries. Methods: Patients with normal vision and various levels of VI were recruited from a secondary eye clinic in rural Kenya and interviewed using time trade-off (TTO). VI was classified using the World Health Organization definition of (normal vision, visual acuity ≥20/60, VI 20/80-20/200, severe VI 20/240-20/400, and blindness <20/400). Results: Mean age of the total sample ( N = 303) was 50.3 years (standard deviation, SD, ±18.17 years), and 51.5% of patients were male. Most were small-scale farmers and illiteracy was high at 40%. Mean TTO scores per group were: normal vision 0.93 (SD ± 0.10), VI 0.88 (SD ± 0.14), severe VI 0.86 (SD ± 0.13), blindness 0.73 (SD ± 0.17; p ≤ 0.001). Lower TTO scores were independently associated with worse visual acuity ( p ≤ 0.001), longer duration of disease ( p ≤ 0.001) and illiteracy ( p = 0.011), but not with cause of VI, age, sex, marital status, socioeconomic status, or systemic comorbidities in multivariate analyses. Overall, TTO scores were considerably higher than those reported from high-income countries at similar levels of VI. Conclusion: In this rural African population, duration and extent of vision loss, rather than cause, socioeconomic factors and comorbidities affected vision-related quality of life. Our findings underline the importance of providing sight-restoring treatment as timely as possible and the necessity of enhancing rehabilitation efforts for those with non-curable eye diseases. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
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