PubMed:23645372 JSONTXT

{"project":"Allie","denotations":[{"id":"SS1_23645372_2_0","span":{"begin":112,"end":129},"obj":"expanded"},{"id":"SS2_23645372_2_0","span":{"begin":131,"end":133},"obj":"abbr"},{"id":"SS1_23645372_2_1","span":{"begin":135,"end":150},"obj":"expanded"},{"id":"SS2_23645372_2_1","span":{"begin":152,"end":159},"obj":"abbr"}],"relations":[{"id":"AE1_23645372_2_0","pred":"abbreviatedTo","subj":"SS1_23645372_2_0","obj":"SS2_23645372_2_0"},{"id":"AE1_23645372_2_1","pred":"abbreviatedTo","subj":"SS1_23645372_2_1","obj":"SS2_23645372_2_1"}],"text":"High myopia-partial reduction ortho-k: a 2-year randomized study.\nPURPOSE: To investigate if the combination of partial reduction (PR) orthokeratology (ortho-k) and spectacles for residual refractive errors in the daytime was effective to slow myopic progression in high myopic children.\nMETHODS: High myopic children (aged 8 to 11 years) with spherical equivalent refraction at least -5.75 diopters (D) and myopia -5.00 D or more myopic were recruited and randomly assigned into PR ortho-k and control groups. Subjects in the PR ortho-k group were fitted with custom made four-zone ortho-k lenses with target reduction of 4.00 D for both eyes, and the residual refractive errors were corrected with single-vision spectacles for clear vision in the daytime. Control subjects were fully corrected with single-vision spectacles. Axial length of each eye of all subjects was measured with the IOLMaster at 6-month intervals by a masked examiner. This study was registered at www.clinicaltrial.gov with the identifier NCT00977236.\nRESULTS: Fifty-two subjects were recruited and randomized to the PR ortho-k and control groups. Twelve PR ortho-k and 16 control subjects completed the study. Compared with the residual refractive errors at the 1-month visit (after stabilization of ortho-k treatment), the median increase in noncycloplegic residual myopia at the 24-month visit was 0.13 D. In the control group, the median increase in myopia was 1.00 D at the end of the study. The mean ± SD increases in axial length were 0.19 ± 0.21 mm in the PR ortho-k group and 0.51 ± 0.32 mm in the control group (95% confidence interval, -0.55 to -0.12; unpaired t test, p = 0.005).\nCONCLUSIONS: This single-masked randomized study showed that PR ortho-k effectively slowed myopic progression in high myopes. Axial length elongation was 63% slower in PR ortho-k-treated children compared with children wearing spectacles."}

{"project":"PubmedHPO","denotations":[{"id":"T1","span":{"begin":244,"end":250},"obj":"HP_0000545"},{"id":"T2","span":{"begin":266,"end":277},"obj":"HP_0011003"},{"id":"T3","span":{"begin":271,"end":277},"obj":"HP_0000545"}],"text":"High myopia-partial reduction ortho-k: a 2-year randomized study.\nPURPOSE: To investigate if the combination of partial reduction (PR) orthokeratology (ortho-k) and spectacles for residual refractive errors in the daytime was effective to slow myopic progression in high myopic children.\nMETHODS: High myopic children (aged 8 to 11 years) with spherical equivalent refraction at least -5.75 diopters (D) and myopia -5.00 D or more myopic were recruited and randomly assigned into PR ortho-k and control groups. Subjects in the PR ortho-k group were fitted with custom made four-zone ortho-k lenses with target reduction of 4.00 D for both eyes, and the residual refractive errors were corrected with single-vision spectacles for clear vision in the daytime. Control subjects were fully corrected with single-vision spectacles. Axial length of each eye of all subjects was measured with the IOLMaster at 6-month intervals by a masked examiner. This study was registered at www.clinicaltrial.gov with the identifier NCT00977236.\nRESULTS: Fifty-two subjects were recruited and randomized to the PR ortho-k and control groups. Twelve PR ortho-k and 16 control subjects completed the study. Compared with the residual refractive errors at the 1-month visit (after stabilization of ortho-k treatment), the median increase in noncycloplegic residual myopia at the 24-month visit was 0.13 D. In the control group, the median increase in myopia was 1.00 D at the end of the study. The mean ± SD increases in axial length were 0.19 ± 0.21 mm in the PR ortho-k group and 0.51 ± 0.32 mm in the control group (95% confidence interval, -0.55 to -0.12; unpaired t test, p = 0.005).\nCONCLUSIONS: This single-masked randomized study showed that PR ortho-k effectively slowed myopic progression in high myopes. Axial length elongation was 63% slower in PR ortho-k-treated children compared with children wearing spectacles."}