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Orthokeratology

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https://www.readbyqxmd.com/read/27898447/a-review-of-the-potential-factors-influencing-myopia-progression-in-children-using-orthokeratology
#1
Xiao Yang, Zhouyue Li, Junwen Zeng
Myopia has become a worldwide public health issue. Recent studies have consistently reported that orthokeratology (Ortho-K) significantly inhibits the progression of myopia by slowing the elongation of axial length. It has been hypothesized that this effect results from the induction of peripheral myopic defocus, which is a result of the effects of the Ortho-K lenses on the midperipheral corneal topography. Previous studies have investigated the relationship between predicting factors and the inhibitory effect of Ortho-K for slowing childhood myopic progression and found some meaningful results; however, some of the findings are controversial...
November 2016: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/27898441/epidemiology-of-myopia
#2
Pei-Chang Wu, Hsiu-Mei Huang, Hun-Ju Yu, Po-Chiung Fang, Chueh-Tan Chen
Myopia is not a simple refractive error, but an eyesight-threatening disease. There is a high prevalence of myopia, 80% to 90%, in young adults in East Asia; myopia has become the leading cause of blindness in this area. As the myopic population increases globally, the severity of its impact is predicted. Approximately one fifth of the myopic population has high myopia (≥-6 diopters), which results in irreversible vision loss such as retinal detachment, choroidal neovascularization, cataracts, glaucoma, and macular atrophy...
November 2016: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/27873014/binocular-function-changes-produced-in-response-to-overnight-orthokeratology
#3
Gema Felipe-Marquez, María Nombela-Palomo, Catalina Palomo-Álvarez, Isabel Cacho, Amelia Nieto-Bona
PURPOSE: To analyze the binocular function changes produced on subjects undergoing overnight orthokeratology (OK) treatment over short-term (3 months) and long-term (3 years) wear. METHODS: A prospective, longitudinal study on young adult subjects with low to moderate myopia was carried out. Binocular function was assessed by the following sequence of tests: Distance and near horizontal phoria (Von Graefe technique), distance and near horizontal vergence ranges (Risley rotary prisms), accommodative convergence/accommodation (AC/A) ratio (gradient method) and the near point of convergence (standard push-up technique)...
November 21, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/27867660/corneal-aberrations-contrast-sensitivity-and-light-distortion-in-orthokeratology-patients-1-year-results
#4
Elena Santolaria-Sanz, Alejandro Cerviño, José M González-Méijome
Purpose. To evaluate the corneal higher-order aberrations (HOA), contrast sensitivity function (CSF), and light distortion (LD) in patients undergoing orthokeratology (OK). Methods. Twenty healthy subjects (mean age: 21.40 ± 8 years) with mean spherical equivalent refractive error M = -2.19 ± 0.97 D were evaluated at 1 day, 1 month, and 1 year after starting OK treatment. Monocular LD, photopic monocular CSF, and corneal HOA for 6 mm pupil size were measured. Results. LD showed an increase after the first night (p < 0...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27861262/tear-film-osmolarity-in-response-to-long-term-orthokeratology-treatment
#5
Amelia Nieto-Bona, María Nombela-Palomo, Gema Felipe-Márquez, Miguel A Teus
PURPOSE: To compare tear film osmolarity (TFO) measurements in non-contact lens (CL) wearers and wearers of hydrogel or overnight orthokeratology (OK) CLs, and to assess possible effects of long-term OK on TFO. METHODS: Overall, 108 subjects with moderate myopia participated in 2 experiments, and TFO was measured using the TearLab osmolarity system. In experiment 1, TFO measurements were made in 77 right eyes of 23 non-CL wearers, 26 hydrogel wearers, and 28 OK wearers...
November 16, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27774312/repeatability-and-reproducibility-of-quantitative-corneal-shape-analysis-after-orthokeratology-treatment-using-image-pro-plus-software
#6
Ying Mei, Zhiping Tang, Zhouyue Li, Xiao Yang
Purpose. To evaluate the repeatability and reproducibility of quantitative analysis of the morphological corneal changes after orthokeratology treatment using "Image-Pro Plus 6.0" software (IPP). Methods. Three sets of measurements were obtained: two sets by examiner 1 with 5 days apart and one set by examiner 2 on the same day. Parameters of the eccentric distance, eccentric angle, area, and roundness of the corneal treatment zone were measured using IPP. The intraclass correlation coefficient (ICC) and repetitive coefficient (COR) were used to calculate the repeatability and reproducibility of these three sets of measurements...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27767354/long-term-efficacy-of-orthokeratology-contact-lens-wear-in-controlling-the-progression-of-childhood-myopia
#7
Jacinto Santodomingo-Rubido, César Villa-Collar, Bernard Gilmartin, Ramón Gutiérrez-Ortega, Keiji Sugimoto
PURPOSE: The primary outcome of this study is to compare the axial length growth of white European myopic children wearing orthokeratology contact lenses (OK) to a control group (CT) over a 7-year period. METHODS: Subjects 6-12 years of age with myopia -0.75 to -4.00DS and astigmatism ≤1.00DC were prospectively allocated OK or distance single-vision spectacles (SV) correction. Measurements of axial length (Zeiss IOLMaster), corneal topography, and cycloplegic refraction were taken at 6-month intervals over a 2-year period...
October 21, 2016: Current Eye Research
https://www.readbyqxmd.com/read/27763910/short-term-and-long-term-changes-in-corneal-power-are-not-correlated-with-axial-elongation-of-the-eye-induced-by-orthokeratology-in-children
#8
Jacinto Santodomingo-Rubido, César Villa-Collar, Bernard Gilmartin, Ramón Gutiérrez-Ortega
PURPOSE: To assess the relationship between short-term and long-term changes in power at different corneal locations relative to the change in central corneal power and the 2-year change in axial elongation relative to baseline in children fitted with orthokeratology contact lenses (OK). METHODS: Thirty-one white European subjects 6 to 12 years of age and with myopia -0.75 to -4.00 DS and astigmatism ≤1.00 DC were fitted with OK. Differences in refractive power 3 and 24 months post-OK in comparison with baseline and relative to the change in central corneal power were determined from corneal topography data in eight different corneal regions (i...
October 19, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27755290/mooren-ulcer-in-a-child-wearing-orthokeratology-contact-lenses
#9
Jaeyoung Kim, Mee Kum Kim, Won Ryang Wee, Joo Youn Oh
PURPOSE: To report a case of Mooren ulcer that developed in a pediatric patient wearing orthokeratology overnight contact lenses. METHODS: Case report. RESULTS: A 10-year-old boy was referred to our clinic because of progressive peripheral corneal ulcer in the right eye, despite the intensive use of fortified antibiotic eye drops. The patient had been using overnight orthokeratology lenses for 4 months before presentation of corneal ulcer...
October 13, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27689073/differences-in-dry-eye-questionnaire-symptoms-in-two-different-modalities-of-contact-lens-wear-silicone-hydrogel-in-daily-wear-basis-and-overnight-orthokeratology
#10
Nery García-Porta, Laura Rico-Del-Viejo, Alba Martin-Gil, Gonzalo Carracedo, Jesus Pintor, José Manuel González-Méijome
Purpose. To compare the ocular surface symptoms and signs in an adult population of silicone-hydrogel (Si-Hy) contact lens (CL) wearers with another modality of CL wear, overnight orthokeratology (OK). Materials and Methods. This was a prospective and comparative study in which 31 myopic subjects were fitted with the same Si-Hy CL and 23 underwent OK treatment for 3 months. Dry eye questionnaire (DEQ) was filled in at the beginning of the study and then after 15 days, 1 month, and 3 months using each CL modality...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27668637/effect-of-pupil-size-on-wavefront-refraction-during-orthokeratology
#11
Miguel Faria-Ribeiro, Rafael Navarro, José Manuel González-Méijome
PURPOSE: It has been hypothesized that central and peripheral refraction, in eyes treated with myopic overnight orthokeratology, might vary with changes in pupil diameter. The aim of this work was to evaluate the axial and peripheral refraction and optical quality after orthokeratology, using ray tracing software for different pupil sizes. METHODS: Zemax-EE was used to generate a series of 29 semi-customized model eyes based on the corneal topography changes from 29 patients who had undergone myopic orthokeratology...
November 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27616676/changes-in-corneal-subbasal-nerve-morphology-and-sensitivity-during-orthokeratology-onset-of-change
#12
Edward Lum, Blanka Golebiowski, Helen A Swarbrick
PURPOSE: To investigate changes in corneal subbasal nerve fiber density and orientation during a 3-month orthokeratology (OK) lens wear period and their relationship with concurrent changes in corneal sensitivity. METHODS: Sixteen subjects wore overnight OK lenses for 90 days and were assessed at baseline, Day 30, and Day 90. Nerve images at the corneal apex and temporal mid-periphery were captured from the right eye only using in vivo confocal microscopy and analyzed to calculate nerve fiber density (NFD) and global nerve fiber orientation (GNFO)...
September 8, 2016: Ocular Surface
https://www.readbyqxmd.com/read/27564516/contact-lens-methods-for-clinical-myopia-control
#13
Philip Raey Kidd Turnbull, Oliver James Munro, John Robert Phillips
PURPOSE: A number of optical methods for slowing myopia progression have been tested and are now available. However, data on real-world use in clinical use is scarce. Here, we present a review of the clinical outcomes for patients attending a specialist myopia control clinic at The University of Auckland Optometry School, NZ. CASE SERIES: We report a comparative case series of 110 patients (aged 4-33 years, mean: 12.13 ± 4.58 years, 62% female) who attended the clinic between 2010 and 2014...
September 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27562274/-excessive-medical-problems-in-the-treatment-of-common-eye-diseases-in-children
#14
L H Wang
In this paper, some typical excessive medical problems in the treatment of common eye diseases in children were listed as follows: unnecessary examinations carried out for children with little or no corresponding complaints; prescription for spectacles for physiological hyperopia or astigmatism in children; over-diagnosis, over-or nonstandard-treatment for amblyopia; strabismus surgeries performed in children with esotropia but without full optical correction of hyperopic refractive error, in children with monocular strabismus and amblyopia but without standard cover therapy, in children with intermittent exotropia but without optical correction of myopic refractive errors and myopic anisometropia, and without evaluation of their fusional control ability; exaggerated the harm of myopia and the curative effect of Orthokeratology contact lenses without considering the patient's compliance; cataract surgery performed in infants with partial opacity of the lens that has little effect on the vision...
August 2016: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/27541967/reduced-corneal-sensitivity-and-sub-basal-nerve-density-in-long-term-orthokeratology-lens-wear
#15
Edward Lum, Blanka Golebiowski, Helen A Swarbrick
OBJECTIVES: To investigate changes in corneal sensitivity and nerve morphology in orthokeratology (OK) contact lens wear. METHODS: In a cross-sectional study, 54 subjects (aged 18-45 years) were grouped into three categories: nonlens (NL), soft lens (SCL), and OK lens wearers. Corneal sensitivity was measured at the corneal apex and 2.5 mm temporal to the apex using the Cochet-Bonnet aesthesiometer. Corneal nerve morphology was assessed by sampling a 1 mm area of the corneal sub-basal nerve plexus using the Heidelberg Retinal Tomograph with Rostock Corneal Module at the corneal apex and 2...
July 12, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27464993/effects-of-orthokeratology-on-the-progression-of-low-to-moderate-myopia-in-chinese-children
#16
Mengmei He, Yaru Du, Qingyu Liu, Chengda Ren, Junling Liu, Qianyi Wang, Li Li, Jing Yu
BACKGROUND: To investigate the effectiveness of orthokeratology (ortho-k) in reducing the development of myopia in Chinese children with low to moderate myopia. METHODS: This was a retrospective study. In the ortho-k group, there were141 subjects, and the average age was (9.43 ± 1.10) years. The average spherical equivalent refractive error (SER) was (-2.74 ± 1.15)D, with examinations performed 1, 7, 30, and 90 days and 12 months after the patients started wearing ortho-k lenses...
2016: BMC Ophthalmology
https://www.readbyqxmd.com/read/27435895/morphology-topography-and-optics-of-the-orthokeratology-cornea
#17
Miguel Faria-Ribeiro, Rafael Navarro Belsue, Norberto López-Gil, José Manuel González-Méijome
No abstract text is available yet for this article.
July 1, 2016: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/27341092/short-and-long-term-changes-in-corneal-aberrations-and-axial-length-induced-by-orthokeratology-in-children-are-not-correlated
#18
Jacinto Santodomingo-Rubido, César Villa-Collar, Bernard Gilmartin, Ramón Gutiérrez-Ortega, Asaki Suzaki
PURPOSE: To assess the correlation between changes in corneal aberrations and the 2-year change in axial length in children fitted with orthokeratology (OK) contact lenses. METHODS: Thirty-one subjects 6 to 12 years of age and with myopia -0.75 to -4.00DS and astigmatism ≤1.00DC were fitted with OK. Measurements of axial length and corneal topography were taken at regular intervals over a 2-year period. Corneal topography at baseline and after 3 and 24 months of OK lens wear was used to derive higher-order corneal aberrations (HOA) that were correlated with OK-induced axial length changes at 2 years...
June 20, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27273270/effects-of-orthokeratology-on-choroidal-thickness-and-axial-length
#19
Zhi Chen, Feng Xue, Jiaqi Zhou, Xiaomei Qu, Xingtao Zhou
PURPOSE: To investigate the effect of orthokeratology (ortho-k) treatment on choroidal thickness and its relationship with axial length change. METHODS: Seventy-seven myopic subjects aged between 7 and 17 years were treated with ortho-k lenses (n = 39) or single-vision spectacle lenses (SVL, n = 38). Choroidal thickness and axial length measurements were taken at baseline and repeated 1 week and 3 weeks after lens wear for the ortho-k group and at 3 weeks for the SVL group...
September 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27257322/a-prospective-interventional-study-of-effect-of-accelerated-orthokeratology-on-the-corneal-curvature-and-refraction-among-young-adults-with-myopia
#20
M A Khan, Ashutosh Gupta, T S Ahluwalia, P S Moulick, V S Gurunadh, Sandeep Gupta
BACKGROUND: Orthokeratology with reverse geometry contact lens is a non-surgical alternative to conventional contact lenses for correction of myopia. However, the strength of evidence for its efficacy and safety is limited to retrospective studies and only a few prospective studies. This prospective study, the first on Indian subjects, evaluated the outcome of orthokeratology among young myopes. METHODS: Fifty eyes of 25 young myopes (age 19-29 years) with myopia of -1 to 5...
April 2016: Medical Journal, Armed Forces India
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