The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Ian G Morgan - One of the best experts on this subject based on the ideXlab platform.
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cycloplegic Refraction by 1 cyclopentolate in young adults is it the gold standard the anyang university students eye study auses
British Journal of Ophthalmology, 2019Co-Authors: Shiming Li, Jialing Du, Ian G Morgan, Xiaohui Yang, Jianping Hu, He Li, Ningli WangAbstract:Aims To document the difference between non-cycloplegic and cycloplegic Refraction and explore its associated factors in Chinese young adults. Methods A school-based study including 7971 undergraduates was conducted in Anyang, Henan Province, China. Cycloplegia was achieved with two drops of 1% cyclopentolate and 1 drop of Mydrin P (Tropicamide 0.5%, phenylephrine HCl 0.5%) with a 5 min interval. Non-cycloplegic and cycloplegic Refractions were measured by an autorefractor. A paired-sample t-test and Spearman correlation analysis were used for analysis with data from only the right eyes included. Results Of the 7971 students examined, 7793 (97.8%) with complete data were included, aging 20.2±1.5 years. Male students accounted for 36.8%. Overall, there was a significant difference between non-cycloplegic and cycloplegic SE (spherical equivalent) of 0.83±0.81D (p Conclusion Lack of cycloplegia will lead to significant misclassification of myopia, emmetropia and hyperopia in Chinese young adults. Cycloplegia is therefore essential for this age-group in epidemiological studies.
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outdoor activity reduces the prevalence of myopia in children
Ophthalmology, 2008Co-Authors: Kathryn A Rose, Ian G Morgan, Annette Kifley, Son C Huynh, Wayne Smith, Paul MitchellAbstract:Objective To assess the relationship of near, midworking distance, and outdoor activities with prevalence of myopia in school-aged children. Design Cross-sectional study of 2 age samples from 51 Sydney schools, selected using a random cluster design. Participants One thousand seven hundred sixty-five 6-year-olds (year 1) and 2367 12-year-olds (year 7) participated in the Sydney Myopia Study from 2003 to 2005. Methods Children had a comprehensive eye examination, including cycloplegic Refraction. Parents and children completed detailed questionnaires on activity. Main Outcome Measures Myopia prevalence and mean spherical equivalent (SE) in relation to patterns of near, midworking distance, and outdoor activities. Myopia was defined as SE Refraction ≤−0.5 diopters (D). Results Higher levels of outdoor activity (sport and leisure activities) were associated with more hyperopic Refractions and lower myopia prevalence in the 12-year-old students. Students who combined high levels of near work with low levels of outdoor activity had the least hyperopic mean Refraction (+0.27 D; 95% confidence interval [CI], 0.02–0.52), whereas students who combined low levels of near work with high levels of outdoor activity had the most hyperopic mean Refraction (+0.56 D; 95% CI, 0.38–0.75). Significant protective associations with increased outdoor activity were seen for the lowest ( P = 0.04) and middle ( P = 0.02) tertiles of near-work activity. The lowest odds ratios for myopia, after adjusting for confounders, were found in groups reporting the highest levels of outdoor activity. There were no associations between indoor sport and myopia. No consistent associations between Refraction and measures of activity were seen in the 6-year-old sample. Conclusions Higher levels of total time spent outdoors, rather than sport per se, were associated with less myopia and a more hyperopic mean Refraction, after adjusting for near work, parental myopia, and ethnicity.
Ningli Wang - One of the best experts on this subject based on the ideXlab platform.
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cycloplegic Refraction by 1 cyclopentolate in young adults is it the gold standard the anyang university students eye study auses
British Journal of Ophthalmology, 2019Co-Authors: Shiming Li, Jialing Du, Ian G Morgan, Xiaohui Yang, Jianping Hu, He Li, Ningli WangAbstract:Aims To document the difference between non-cycloplegic and cycloplegic Refraction and explore its associated factors in Chinese young adults. Methods A school-based study including 7971 undergraduates was conducted in Anyang, Henan Province, China. Cycloplegia was achieved with two drops of 1% cyclopentolate and 1 drop of Mydrin P (Tropicamide 0.5%, phenylephrine HCl 0.5%) with a 5 min interval. Non-cycloplegic and cycloplegic Refractions were measured by an autorefractor. A paired-sample t-test and Spearman correlation analysis were used for analysis with data from only the right eyes included. Results Of the 7971 students examined, 7793 (97.8%) with complete data were included, aging 20.2±1.5 years. Male students accounted for 36.8%. Overall, there was a significant difference between non-cycloplegic and cycloplegic SE (spherical equivalent) of 0.83±0.81D (p Conclusion Lack of cycloplegia will lead to significant misclassification of myopia, emmetropia and hyperopia in Chinese young adults. Cycloplegia is therefore essential for this age-group in epidemiological studies.
Shiming Li - One of the best experts on this subject based on the ideXlab platform.
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cycloplegic Refraction by 1 cyclopentolate in young adults is it the gold standard the anyang university students eye study auses
British Journal of Ophthalmology, 2019Co-Authors: Shiming Li, Jialing Du, Ian G Morgan, Xiaohui Yang, Jianping Hu, He Li, Ningli WangAbstract:Aims To document the difference between non-cycloplegic and cycloplegic Refraction and explore its associated factors in Chinese young adults. Methods A school-based study including 7971 undergraduates was conducted in Anyang, Henan Province, China. Cycloplegia was achieved with two drops of 1% cyclopentolate and 1 drop of Mydrin P (Tropicamide 0.5%, phenylephrine HCl 0.5%) with a 5 min interval. Non-cycloplegic and cycloplegic Refractions were measured by an autorefractor. A paired-sample t-test and Spearman correlation analysis were used for analysis with data from only the right eyes included. Results Of the 7971 students examined, 7793 (97.8%) with complete data were included, aging 20.2±1.5 years. Male students accounted for 36.8%. Overall, there was a significant difference between non-cycloplegic and cycloplegic SE (spherical equivalent) of 0.83±0.81D (p Conclusion Lack of cycloplegia will lead to significant misclassification of myopia, emmetropia and hyperopia in Chinese young adults. Cycloplegia is therefore essential for this age-group in epidemiological studies.
Steven C Schallhorn - One of the best experts on this subject based on the ideXlab platform.
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comparison of tropicamide and cyclopentolate for cycloplegic Refractions in myopic adult refractive surgery patients
Journal of Cataract and Refractive Surgery, 2005Co-Authors: Elizabeth M Hofmeister, Sandor E Kaupp, Steven C SchallhornAbstract:Purpose To compare tropicamide 1%, a shorter-acting cycloplegic agent, with cyclopentolate 1% for cycloplegic Refractions in adult refractive surgery patients. Setting Navy Refractive Surgery Center, Ophthalmology, Naval Medical Center, San Diego, California. Methods The study was prospective, single center, with randomized sequencing of cycloplegic agent; each patient received both agents. Thirty consecutive myopic adult refractive surgery patients (mean age 35.4 years) participated. A complete preoperative examination, including cycloplegic Refraction, was obtained twice, 1 week apart. The patient and the examiner were masked to the medication. Main outcome measures included cycloplegic and manifest Refractions, best corrected distance acuity, near-point accommodation, pupil diameters, and subjective appraisal of experience with cycloplegic agents. Results Twenty-eight of 30 patients completed both examinations. Both eyes were measured, but comparisons were limited to right and left eyes, independently. No statistically significant difference was found between the tropicamide and cyclopentolate cycloplegic Refractions (mean difference in MSE ± SD, OD = 0.054 ± 0.214 diopters (D), t = 1.33, P = .10; OS = 0.054 ± 0.253 D, t = 1.12, P = .14). Five eyes of 3 patients had a difference of 0.50 D or greater between the 2 agents; less myopia with cyclopentolate. Near-point testing revealed less residual accommodation with cyclopentolate (difference in MSE, OD = −0.27 ± 0.51 D, t = 2.68, P = .006; OS = −0.32 ± 0.49 D, t = 3.46, P = .001). Subjectively, 24 of 28 (86%) patients preferred tropicamide, 1 (4%) preferred cyclopentolate, and 3 (10%) had no preference. Conclusions There was no statistically significant difference in mean cycloplegic Refractions. Cyclopentolate was more effective than tropicamide in reducing accommodative amplitude in adult myopes (near-point testing). Patients strongly preferred tropicamide.
Xiaohui Yang - One of the best experts on this subject based on the ideXlab platform.
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cycloplegic Refraction by 1 cyclopentolate in young adults is it the gold standard the anyang university students eye study auses
British Journal of Ophthalmology, 2019Co-Authors: Shiming Li, Jialing Du, Ian G Morgan, Xiaohui Yang, Jianping Hu, He Li, Ningli WangAbstract:Aims To document the difference between non-cycloplegic and cycloplegic Refraction and explore its associated factors in Chinese young adults. Methods A school-based study including 7971 undergraduates was conducted in Anyang, Henan Province, China. Cycloplegia was achieved with two drops of 1% cyclopentolate and 1 drop of Mydrin P (Tropicamide 0.5%, phenylephrine HCl 0.5%) with a 5 min interval. Non-cycloplegic and cycloplegic Refractions were measured by an autorefractor. A paired-sample t-test and Spearman correlation analysis were used for analysis with data from only the right eyes included. Results Of the 7971 students examined, 7793 (97.8%) with complete data were included, aging 20.2±1.5 years. Male students accounted for 36.8%. Overall, there was a significant difference between non-cycloplegic and cycloplegic SE (spherical equivalent) of 0.83±0.81D (p Conclusion Lack of cycloplegia will lead to significant misclassification of myopia, emmetropia and hyperopia in Chinese young adults. Cycloplegia is therefore essential for this age-group in epidemiological studies.
