The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Brian Levy - One of the best experts on this subject based on the ideXlab platform.
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A randomized trial of Rigid Gas Permeable contact lenses to reduce progression of children's myopia.
American journal of ophthalmology, 2003Co-Authors: Joanne Katz, Brian Levy, Oliver D. Schein, Tom Cruiscullo, Seang-mei Saw, Rajan U, Tat Keong Chan, Chong Yew Khoo, Sek-jin ChewAbstract:Abstract Purpose To test whether Rigid Gas Permeable (RGP) contact lens wear can reduced the rate of myopia progression in school age children. Design Randomized clinical trial. Methods Setting: Single clinical center. Study Population: Both eyes of 428 Singaporean children. Inclusion Criteria: 6 through 12 years of age with myopia between −1 and −4 diopters, astigmatism ≤ 2 diopters, no prior contact lens wear, no other ocular pathologies.Intervention: Spectacle or RGP lens correction for myopia. After a 3-month adaptation period, 383 children were followed, and 298 (78%) remained after 24 months.Outcome measures: Cycloplegic subjective refraction, keratometry, and axial length measured at 12 and 24 months. Results Children who adapted to contact lenses wore them for a median of 7 hours per day, but no more than 40% wore them at least 8 hours per day, 7 days per week. Spectacles were worn for a median of 15 hours per day at the time of the 24-month follow-up. There was an increase in the spherical equivalent of −1.33 and −1.28 diopters ( P = .64), and axial length increased by 0.84 and 0.79 mm ( P = .38) over 2 years among children randomized to contact lenses and spectacles, respectively. Adjustment for baseline differences between the groups and for hours per day of contact lens wear did not alter these findings. Conclusions Rigid Gas Permeable lenses did not slow the rate of myopia progression, even among children who used them regularly and consistently. It is unlikely that this intervention holds promise as a method by which to slow the rate of progression of myopia in children.
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Complications of Rigid Gas Permeable lenses for extended wear.
Optometry and vision science : official publication of the American Academy of Optometry, 1991Co-Authors: Brian LevyAbstract:A retrospective study of 174 patients wearing Rigid Gas Permeable lenses for a period of 2 years was carried out to determine the success rate and types of complications which typically occur. The results indicate that these types of lenses are a viable modality for extended wear, as the majority of signs which may lead to serious complications can be detected relatively early. When these signs were detected the patients were switched to daily wear and most were able to wear these lenses uneventfully. However, the results also indicate that unexpected problems can occur, and thus frequent follow-up is essential in these patients in order to avoid the potentially sight-threatening problems which have come to be associated with extended wearing of contact lenses.
Shima Dehghani - One of the best experts on this subject based on the ideXlab platform.
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Effects of Soft Toric, Rigid Gas-Permeable, and Mini-Scleral Lenses on Corneal Microstructure Using Confocal Microscopy.
Eye & contact lens, 2020Co-Authors: Fateme Alipour, Mahya Soleimanzade, Golshan Latifi, Sepideh Haji Aghaie, Maryam Kasiri, Shima DehghaniAbstract:Objective:To determine effects of wearing soft toric silicone hydrogel, Rigid Gas-Permeable (RGP), and mini-scleral lenses on corneal microstructure using confocal microscopy.Method:A prospective cohort study was conducted on 33 neophyte patients fitted with contact lenses (avg. age: 26±7 years) in
John Ching-jen Hsiao - One of the best experts on this subject based on the ideXlab platform.
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Gradual diminish of post Lasik corneal ectasia with a Rigid Gas Permeable lens
2013Co-Authors: Santos Shan-yu Tseng, David Chao-kai Chang, John Ching-jen HsiaoAbstract:Abstract: Corneal ectasia following Laser in situ keratomileussis (Lasik), a known complication can only be treated with the use of Rigid Gas Permeable contact lens, penetrating keratoplasty or corneal cross-linking surgery. A 33 year old Asian male was diagnosed with corneal ectasia in the right eye several months after bilateral Lasik and was fitted with a Rigid Gas Permeable contact lens in our center. During weeks and months of following visits, the ectasia gradually diminished to protrusion-free corneal shape with the aided visual acuity of 20/20 by the 11 months ’ time. Patient’s cornea however did return to its ecstatic state in about 9 days once the Rigid lens was ceased to wear as a test of corneal stability. During the follow up visit in 5 years later, without the trace of ectasia, a steeper base curve of Rigid lens was needed for a better fitting pattern, suggesting the cornea had protruded further even under the event of lens wear. The Rigid lens seems to have a biomechanical influence on patient’s ectasia condition following Lasik
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Customized Rigid Gas Permeable lens fitting for keratoconus
2012Co-Authors: John Ching-jen Hsiao, Jung-kai Tseng, Tzu-lan Chen, Wen-pin LinAbstract:Keratoconus, a non-inflammatoryectasic disorder of the cornea, with corneal thinning and distortion resulting high degree of irregular myopic astigmatism. To best correct patients' vision with keartoconus, one would require Rigid Gas Permeable contact lens. Due to the distorted shape of cornea, the correction of keratoconus remains one of the most difficult challenges in the art of contact lens fitting. In this paper, we trialed and fitted a newly diagnosed bilateral keatoconus patient with many different parameters in order to reach a final appropriate lens design for maintaining the patient's minimum binocularity and improving his visual acuity as much as possible. The patient was in his early 30's with no previous knowledge of kearotoconus and came in to our center for a pre- Lasik evaluation. Diagnosis of the disorder was confirmed by axial map and ring verification of corneal topography. The final treatment of course included special designs of Rigid Gas Permeable lenses for both eyes. Patient was very impressed with result which allows his vision to improve 4 lines in both OD and OS on the vision test chart. (John Ching-Jen Hsiao, Jung-Kai Tseng, Tzu-Lan Chen, Wen-Pin Lin. Customized Rigid Gas Permeable lens fitting for keratoconus. Life Sci J. 2012, 9(4):5241-5243) (ISSN:1097-8135). http://www.lifesciencesite.com.779
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Comparison of soft contact lens and Rigid Gas Permeable lens fitting after laser in situ keratomileusis (LASIK)
2012Co-Authors: John Ching-jen Hsiao, An-chi HungAbstract:Despite the accuracy of laser in situ keratomileusis (LASIK), a portion of patients will remain partially under-corrected or over-corrected following the surgery. For these patients, contact lenses maybe the best conservative option for visual rehabilitation and sustainability of minimum level of the binocular vision post operation. Due to the fact that cornea contour has been changed after Lasik surgery, fitting lenses on these corneas can be one of the most difficult challenges in the art of contact lens fitting. In general, patients with minor regular astigmatism may be fitted successfully with spherical or toric soft contact lenses. Patients with corneal irregularities should be fitted with Rigid Gas Permeable lenses of traditional 3 or 4 curves or special designs such as keratoconus lens or reverse geometry lens. (John Ching-Jen Hsiao, An-Chi Hung. Comparison of soft contact lens and Rigid Gas Permeable lens fitting after laser in situ keratomileusis (LASIK). Life Sci J. 2012, 9(4):5662-5665 ) (ISSN:1097-8135). http://www.lifesciencesite.com.843
Koh-hei Sonoda - One of the best experts on this subject based on the ideXlab platform.
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Bevel toric multicurve Rigid Gas-Permeable lens for keratoconus
Japanese Journal of Ophthalmology, 2013Co-Authors: Ryoji Yanai, Kiichi Ueda, Koh-hei SonodaAbstract:Purpose To evaluate the efficacy and safety of Twinbel bevel toric, a newly designed Rigid Gas-Permeable (RGP) lens with a toric bevel curvature, for keratoconus. Methods A retrospective analysis of nine eyes of patients with keratoconus who had been wearing RGP contact lenses and were switched to Twinbel bevel toric at Yamaguchi University Hospital. Visual acuity and contrast sensitivity were measured under photopic conditions. Complaint symptoms were recorded as primary outcome measures at follow-up visits. Efficacy and safety were evaluated at 12 weeks after the switch to Twinbel bevel toric or later. Results Five eyes (55.6 %) showed an improvement in visual acuity with Twinbel bevel toric compared with the previous lens, whereas four eyes (44.4 %) maintained the same visual acuity as before. The mean best corrected visual acuity ± SD with Twinbel bevel toric was 0.01 ± 0.40 logMAR, significantly better ( P = 0.044, paired Student’s t test) than that (0.23 ± 0.51 logMAR) with the previous lens. Contrast sensitivity and subjective complaint scores did not differ significantly between Twinbel bevel toric and the previous lens. No serious complications of Twinbel bevel toric wear were observed. Conclusions Fitting of Twinbel bevel toric improved visual acuity in eyes affected by keratoconus, thus providing a viable alternative for management of such eyes.
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Bevel toric multicurve Rigid Gas-Permeable lens for keratoconus
Japanese journal of ophthalmology, 2012Co-Authors: Ryoji Yanai, Kiichi Ueda, Koh-hei SonodaAbstract:Purpose To evaluate the efficacy and safety of Twinbel bevel toric, a newly designed Rigid Gas-Permeable (RGP) lens with a toric bevel curvature, for keratoconus.
Victor L. Perez - One of the best experts on this subject based on the ideXlab platform.
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Role of Rigid Gas-Permeable scleral contact lenses in the management of advanced atopic keratoconjunctivitis.
Cornea, 2007Co-Authors: Ron Margolis, Vishakha Thakrar, Victor L. PerezAbstract:PURPOSE To describe the use of Rigid Gas-Permeable scleral contact lenses (ScCL) in the treatment and visual rehabilitation of patients with medically controlled advanced atopic keratoconjunctivitis (AKC). METHODS Retrospective chart review of 10 eyes with medically controlled advanced AKC whose treatment included the use of ScCL for protection of the cornea from the ocular surface environment and visual rehabilitation. Outcomes measured were changes in biomicroscopic findings and visual acuity. RESULTS Median follow-up period after ScCL fitting was 20.5 months (range, 14-32 months). An improvement in conjunctival hyperemia and corneal epithelial defects was observed in all eyes. Median best-corrected visual acuity before ScCL was logMAR 0.651 (Snellen 20/90; range, 20/45-20/400). After proper ScCL fitting, median logMAR visual acuity was 0.239 (Snellen 20/35; range, 20/20-20/50; P = 0.001). All patients gained at least 1 line of vision after initiation of ScCL, and 9 of 10 eyes experienced an improvement of at least 2 lines of vision. ScCL use was well tolerated by all patients, and no complications or infections occurred as a result of ScCL wear. CONCLUSIONS Rigid Gas-Permeable ScCL are useful and safe to use in the management of the ocular surface and in the visual rehabilitation of eyes with medically controlled advanced AKC.
