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Paul J Foster - One of the best experts on this subject based on the ideXlab platform.
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uncorrected refractive error in older british adults the epic norfolk eye study
British Journal of Ophthalmology, 2012Co-Authors: Justin C Sherwin, Anthony P Khawaja, David C Broadway, Robert Luben, Shabina Hayat, Nichola Dalzell, Nicholas J Wareham, Kaytee Khaw, Paul J FosterAbstract:Aim To investigate the prevalence of, and demographic associations with, uncorrected refractive error (URE) in an older British population. Methods Data from 4428 participants, aged 48e89 years, who attended an eye examination in the third health check of the European Prospective Investigation into Cancer-Norfolk study and had also undergone an ophthalmic examination were assessed. URE was defined as $1 line improvement of visual acuity with pinhole-correction in the better eye in participants with LogMar presenting visual acuity (PVA) <0.3 (PVA <6/12). Refractive error was measured using an autorefractor without cycloplegia. Myopia was defined as spherical equivalent #� 0.5 dioptre, and Hypermetropia $0.5 dioptre. Results Adjusted to the 2010 midyear British population, the prevalence of URE in this Norfolk population was 1.9% (95% CI 0.6% to 3.1%). Lower selfrated distance vision was correlated with higher prevalence of URE (ptrend<0.001). In a multivariate logistic regression model adjusting for age, gender, retirement status, educational level and social class, independent significant associations with URE were increasing age (ptrend<0.001) and having hypermetropic or myopic refractive error. Wearing distance spectacles was inversely associated with URE (OR 0.34, 95% CI 0.21 to 0.55, p<0.001). There were 3063 people (69.2%) who wore spectacles/contact lenses for distance vision. Spectacle wear differed according to type of refractive error (p<0.001), and use rose with increasing severity of refractive error (ptrend<0.001). Conclusion Although refractive error is common, the prevalence of URE was found to be low in this population reflecting a low prevalence of PVA<0.3.
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Hypermetropia axial length and hypertension the tanjong pagar survey
American Journal of Ophthalmology, 2006Co-Authors: Athena W P Foong, Tien Yin Wong, Seangmei Saw, Paul J FosterAbstract:Purpose To examine the relationship among Hypermetropia, axial length, and hypertension in a Chinese population. Design Population-based cross-sectional study. Methods This study included 1213 Chinese individuals aged 40 to 81 years. Hypertension was defined as systolic blood pressure ≥140 mm Hg, diastolic blood pressure ≥90 mm Hg, or self-report history of antihypertension treatment. Refraction was determined with an autorefractor and refined subjectively. A-mode ultrasound scanning was used to measure axial length. Results The crude odds ratio of hypertension was 2.5 (95% CI, 1.4–4.6) for moderate Hypermetropia (≥+2.00 spheric equivalent diopters) vs high myopia (≤–6.00 diopters), and 1.4 (95% CI, 0.9–2.1) for highest vs lowest axial length quintile. These associations were no longer significant after adjustment for age, gender, education, housing type, and income. Conclusions These data provide no evidence that Hypermetropia or shorter axial length is associated independently with hypertension in Chinese individuals.
Suzanne G Mclennan - One of the best experts on this subject based on the ideXlab platform.
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wavefront aberrations following laser in situ keratomileusis and refractive lens exchange for Hypermetropia
Journal of Refractive Surgery, 2004Co-Authors: David A. Atchison, Julie M Albietz, Lee M Lenton, Suzanne G MclennanAbstract:Purpose: To compare the magnitude of aberrations in eyes after elective hypermetropic laser in situ keratomileusis (LASIK) and refractive lens exchange (clear lens replacement). Methods: Forty-nine patients (92 eyes) had hypermetropic LASIK and 28 (48 eyes) had refractive lens exchange; 23 hypermetropic subjects (41 eyes) were the control group. LASIK was performed with the Nidek EC-5000 excimer laser; ablation zones 5.5 to 6.0-mm in diameter. For refractive lens exchange, all but four IOLs were made of foldable acrylic. Aberrations and corneal topography were measured with the Nidek OPD-Scan model ARK-10000 more than 12 months after surgery. The higher-order root-mean-square (HORMS) wave aberrations for combined third to sixth Zernike aberration orders and the Zernike spherical aberration coefficient C04 at both 4.2-mm and 6.0-mm pupil sizes were calculated. Results: For LASIK group, surgical refractive change correlated significantly with total, corneal, and internal HORMS and spherical aberrations (except with internal spherical aberration for a 4.2-mm diameter pupil). For the refractive lens exchange group, there were no significant correlations of surgical refractive change with any of these factors. Similarly, there were no significant correlations of refraction with any of these factors for the control group. For a 3-diopter change in refraction with 6-mm pupils, LASIK doubled the total HORMS aberrations. LASIK changed the sign of spherical aberration from positive to negative by increasing the negative asphericity of the anterior cornea. Taking age differences between groups into account, refractive lens exchange increased the total HORMS aberrations by 40% compared with that of the control group, but this was not statistically significant. However, refractive lens exchange significantly increased total spherical aberration. Conclusion: Refractive lens exchange was a better refractive procedure than LASIK for minimizing total higher order optical aberrations that accompany hypermetropic refractive surgery.
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wavefront aberrations following laser in situ keratomileusis and refractive lens exchange corrections for Hypermetropia
Faculty of Health; Institute of Health and Biomedical Innovation, 2004Co-Authors: David A. Atchison, Julie M Albietz, Lee M Lenton, Suzanne G MclennanAbstract:Purpose: To compare the magnitude of aberrations in eyes after elective hypermetropic laser in situ keratomileusis (LASIK) and refractive lens exchange (clear lens replacement). Methods: Forty-nine patients (92 eyes) had hypermetropic LASIK and 28 (48 eyes) had refractive lens exchange; 23 hypermetropic subjects (41 eyes) were the control group. LASIK was performed with the Nidek EC-5000 excimer laser; ablation zones 5.5 to 6.0-mm in diameter. For refractive lens exchange, all but four IOLs were made of foldable acrylic. Aberrations and corneal topography were measured with the Nidek OPD-Scan model ARK-10000 more than 12 months after surgery. The higher-order root-mean-square (HORMS) wave aberrations for combined third to sixth Zernike aberration orders and the Zernike spherical aberration coefficient C04 at both 4.2-mm and 6.0-mm pupil sizes were calculated. Results: For LASIK group, surgical refractive change correlated significantly with total, corneal, and internal HORMS and spherical aberrations (except with internal spherical aberration for a 4.2-mm diameter pupil). For the refractive lens exchange group, there were no significant correlations of surgical refractive change with any of these factors. Similarly, there were no significant correlations of refraction with any of these factors for the control group. For a 3-diopter change in refraction with 6-mm pupils, LASIK doubled the total HORMS aberrations. LASIK changed the sign of spherical aberration from positive to negative by increasing the negative asphericity of the anterior cornea. Taking age differences between groups into account, refractive lens exchange increased the total HORMS aberrations by 40% compared with that of the control group, but this was not statistically significant. However, refractive lens exchange significantly increased total spherical aberration. Conclusion: Refractive lens exchange was a better refractive procedure than LASIK for minimizing total higher order optical aberrations that accompany hypermetropic refractive surgery.
Cagri Ilhan - One of the best experts on this subject based on the ideXlab platform.
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comparison of 9 0 and 9 2 mm flap diameter options of femtosecond laser in situ keratomileusis for Hypermetropia and hypermetropic astigmatism
Journal of Ophthalmology, 2019Co-Authors: Kemal Ozulken, Cagri IlhanAbstract:Aim. To compare the postoperative one-year outcomes of asphericity (Q) and high order aberration (HOA) values of 9.0 and 9.2 mm diameter flap groups in Hypermetropia and hypermetropic astigmatism subjects who underwent femtosecond laser in-situ keratomileusis (LASIK). Materials and Methods. The study included 68 eyes of 34 patients. A femtosecond laser platform (Allegrato Wave, Wavelight AG, Erlangen, Germany) was used for flap cutting. Corneal stroma was ablated using Wavelight EX500 with wavefront-optimized profile (WaveLight GmbH, Erlangen, Germany). 9.0 mm flap diameter was randomly chosen for one eye, and 9.2 mm flap diameter was chosen for the fellow eye. Two eyes of the patients who used two different flap diameters were enrolled into two different groups. Corneal stroma was ablated using Wavelight EX500 with wavefront-optimized profile (WaveLight GmbH, Erlangen, Germany). Postoperative one-year outcomes of Q and HOA values of 9.0 and 9.2 mm diameter flap groups were compared statistically. Results. The preoperative manifest refraction spherical equivalents of the 9.0 and 9.2 mm diameter flap groups were 1.86 ± 1.81 D and 1.69 ± 1.99 D ( ). No intraoperative or postoperative complications were observed. At postoperative one-year, Q values were 0.98 ± 0.13 D and 0.91 ± 0.15 D ( ). HOAs including horizontal and vertical coma, horizontal and vertical trefoil, spherical aberration, and second order vertical coma were not significantly different ( for all). Total HOA values were 1.62 ± 0.14 and 1.40 ± 0.16, in the 9.0 and 9.2 mm diameter flap groups, respectively ( ). Conclusion. Both the 9.0 and 9.2 mm diameter flap options in femtosecond LASIK are equally safe and effective. Many of the HOA values are similar in both options, and better results were provided in terms of total HOA and Q values with the 9.2 mm diameter flap option. This study was registered with trial registration number 118-011.
Tien Yin Wong - One of the best experts on this subject based on the ideXlab platform.
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Hypermetropia axial length and hypertension the tanjong pagar survey
American Journal of Ophthalmology, 2006Co-Authors: Athena W P Foong, Tien Yin Wong, Seangmei Saw, Paul J FosterAbstract:Purpose To examine the relationship among Hypermetropia, axial length, and hypertension in a Chinese population. Design Population-based cross-sectional study. Methods This study included 1213 Chinese individuals aged 40 to 81 years. Hypertension was defined as systolic blood pressure ≥140 mm Hg, diastolic blood pressure ≥90 mm Hg, or self-report history of antihypertension treatment. Refraction was determined with an autorefractor and refined subjectively. A-mode ultrasound scanning was used to measure axial length. Results The crude odds ratio of hypertension was 2.5 (95% CI, 1.4–4.6) for moderate Hypermetropia (≥+2.00 spheric equivalent diopters) vs high myopia (≤–6.00 diopters), and 1.4 (95% CI, 0.9–2.1) for highest vs lowest axial length quintile. These associations were no longer significant after adjustment for age, gender, education, housing type, and income. Conclusions These data provide no evidence that Hypermetropia or shorter axial length is associated independently with hypertension in Chinese individuals.
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Hypermetropia is not associated with hypertension the blue mountains eye study
American Journal of Ophthalmology, 2006Co-Authors: Gerald Liew, Paul Mitchell, Tien Yin Wong, Jie Jin WangAbstract:Purpose An association between Hypermetropia and hypertension was recently reported. We sought to verify this finding in the Blue Mountains Eye Study cohort (n = 3654; ages 49 to 97 years). Design Cohort study. Methods We defined Hypermetropia as mean spheric equivalent refraction (SER) >1.00 diopter, myopia as mean SER Results Of 1290 people who were at risk of the development of hypertension, 378 people developed incident severe hypertension after five years. The multivariate-adjusted relative risk of incident hypertension in persons with Hypermetropia compared with those with emmetropia was 1.06 (95% CI, 0.89 to 1.26); the relative risk in persons with myopia was 1.22 (95% CI, 0.96 to 1.56). Conclusion Neither Hypermetropia nor myopia was associated with incident hypertension in this older population.
David A. Atchison - One of the best experts on this subject based on the ideXlab platform.
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Hypermetropia or hyperopia
Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists), 2014Co-Authors: W. Neil Charman, Sotiris Plainis, Jos J. Rozema, David A. AtchisonAbstract:A recent suggestion by a reviewer of a manuscript that the use of the word ‘Hypermetropia’ was incorrect and that it should be replaced by ‘hyperopia’ caused us to look again at the literature of the subject to see if this criticism was justified. The background is an interesting one...
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wavefront aberrations following laser in situ keratomileusis and refractive lens exchange for Hypermetropia
Journal of Refractive Surgery, 2004Co-Authors: David A. Atchison, Julie M Albietz, Lee M Lenton, Suzanne G MclennanAbstract:Purpose: To compare the magnitude of aberrations in eyes after elective hypermetropic laser in situ keratomileusis (LASIK) and refractive lens exchange (clear lens replacement). Methods: Forty-nine patients (92 eyes) had hypermetropic LASIK and 28 (48 eyes) had refractive lens exchange; 23 hypermetropic subjects (41 eyes) were the control group. LASIK was performed with the Nidek EC-5000 excimer laser; ablation zones 5.5 to 6.0-mm in diameter. For refractive lens exchange, all but four IOLs were made of foldable acrylic. Aberrations and corneal topography were measured with the Nidek OPD-Scan model ARK-10000 more than 12 months after surgery. The higher-order root-mean-square (HORMS) wave aberrations for combined third to sixth Zernike aberration orders and the Zernike spherical aberration coefficient C04 at both 4.2-mm and 6.0-mm pupil sizes were calculated. Results: For LASIK group, surgical refractive change correlated significantly with total, corneal, and internal HORMS and spherical aberrations (except with internal spherical aberration for a 4.2-mm diameter pupil). For the refractive lens exchange group, there were no significant correlations of surgical refractive change with any of these factors. Similarly, there were no significant correlations of refraction with any of these factors for the control group. For a 3-diopter change in refraction with 6-mm pupils, LASIK doubled the total HORMS aberrations. LASIK changed the sign of spherical aberration from positive to negative by increasing the negative asphericity of the anterior cornea. Taking age differences between groups into account, refractive lens exchange increased the total HORMS aberrations by 40% compared with that of the control group, but this was not statistically significant. However, refractive lens exchange significantly increased total spherical aberration. Conclusion: Refractive lens exchange was a better refractive procedure than LASIK for minimizing total higher order optical aberrations that accompany hypermetropic refractive surgery.
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wavefront aberrations following laser in situ keratomileusis and refractive lens exchange corrections for Hypermetropia
Faculty of Health; Institute of Health and Biomedical Innovation, 2004Co-Authors: David A. Atchison, Julie M Albietz, Lee M Lenton, Suzanne G MclennanAbstract:Purpose: To compare the magnitude of aberrations in eyes after elective hypermetropic laser in situ keratomileusis (LASIK) and refractive lens exchange (clear lens replacement). Methods: Forty-nine patients (92 eyes) had hypermetropic LASIK and 28 (48 eyes) had refractive lens exchange; 23 hypermetropic subjects (41 eyes) were the control group. LASIK was performed with the Nidek EC-5000 excimer laser; ablation zones 5.5 to 6.0-mm in diameter. For refractive lens exchange, all but four IOLs were made of foldable acrylic. Aberrations and corneal topography were measured with the Nidek OPD-Scan model ARK-10000 more than 12 months after surgery. The higher-order root-mean-square (HORMS) wave aberrations for combined third to sixth Zernike aberration orders and the Zernike spherical aberration coefficient C04 at both 4.2-mm and 6.0-mm pupil sizes were calculated. Results: For LASIK group, surgical refractive change correlated significantly with total, corneal, and internal HORMS and spherical aberrations (except with internal spherical aberration for a 4.2-mm diameter pupil). For the refractive lens exchange group, there were no significant correlations of surgical refractive change with any of these factors. Similarly, there were no significant correlations of refraction with any of these factors for the control group. For a 3-diopter change in refraction with 6-mm pupils, LASIK doubled the total HORMS aberrations. LASIK changed the sign of spherical aberration from positive to negative by increasing the negative asphericity of the anterior cornea. Taking age differences between groups into account, refractive lens exchange increased the total HORMS aberrations by 40% compared with that of the control group, but this was not statistically significant. However, refractive lens exchange significantly increased total spherical aberration. Conclusion: Refractive lens exchange was a better refractive procedure than LASIK for minimizing total higher order optical aberrations that accompany hypermetropic refractive surgery.