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首页> 外文期刊>Eye & contact lens >Nomogram for spherical RGP contact lens fitting in patients with pellucid marginal corneal degeneration (PMCD).
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Nomogram for spherical RGP contact lens fitting in patients with pellucid marginal corneal degeneration (PMCD).

机译：球蛋白RGP角膜接触镜验配术用于透明边缘性角膜变性（PMCD）患者。

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摘要

PURPOSE: To present a nomogram for spherical rigid gas-permeable (RGP) contact lens fitting in patients with pellucid marginal corneal degeneration (PMCD). METHODS: Retrospective review of the medical records of 24 patients diagnosed with PMCD who underwent an RGP contact lens trial at the Bausch & Lomb contact lens center between April 1995 and March 2002 at L.V. Prasad Eye Institute in Hyderabad, India. Data collected included age and sex of patients, duration of presenting symptoms, associated ocular conditions, presenting visual acuity, and degree of astigmatism. For the purpose of analysis, the astigmatism was classified into four groups: group 1, less than 5.00 diopters (D); group 2, 5.00 to 10.00D; group 3, 10.00 to 15.00D; and group 4, 15.00 to 20.00D. The final lens parameters, the patient's comfort level, and the duration of follow-up were analyzed. RESULTS: Forty eyes of 24 patients were fitted with RGP contact lenses during the study period. Sixteen were male patients and eight were female patients. The age of the patients ranged from 13 to 59 years, with a mean of 35.5 years. Twenty-two (91.7%) patients had typical inferior PMCD, whereas the other two (8.3%) had superior PMCD. The mean corneal curvature was 7.1 mm (range, 5.9-7.8 mm) in group 1, 6.9 mm (range, 6.6-7.9 mm) in group 2, 7.5 mm (range, 6.5-7.8 mm) in group 3, and 7.9 mm (range, 6.8-7.8 mm) in group 4. The mean base curve of the final fitting lens was 6.3 mm (range, 5.7-7.8 mm) in group 1, 6.8 mm (range, 5.9-7.8 mm) in group 2, 7.5 mm (range, 6-8.2 mm) in group 3, and 7.2 mm (range, 6.6-7.8 mm) in group 4. The mean lens diameter of the final fitting lens was 8.7 mm (range, 8.6-10.6 mm) in group 1, 9.5 mm (range, 8.8-10.5 mm) in group 2, 10.2 mm (range, 8.8-11.5 mm) in group 3, and 10.4 mm (range, 8.8-11.3 mm) in group 4. The common fluorescein patterns were central touch with midcentral peripheral pooling in 14 (35%) and dumbbell pattern in seven (17.%). The final visual acuity range with an RGP lens in the four astigmatism groups was 20/40 to 20/20 in group 1, 20/30 to 20/20 in group 2, 20/40 to 20/20 in group 3, and 20/200 to 20/50 in group 4. Twenty-one patients were comfortable with an RGP lens, and the mean duration of follow-up was 13 months. Three patients discontinued lens wear. In one patient, the lens was not stable, and the other two experienced discomfort with their lenses. CONCLUSIONS: Spherical rigid gas-permeable lenses are a good option for patients even with advanced PMCD. In patients with astigmatism of less than 10D, a lens with a base curve of 6.0 to 7.0 mm and a diameter of 8.0 to 9.5 mm seems to be a good initial lens for trial, and for patients with astigmatism of more than 10D, a lens with a base curve of 7.0 to 7.5 mm and a diameter of 10.0 to 10.5 mm seems to be a good initial lens.
机译：目的：为患有透明性边缘性角膜变性（PMCD）的患者提供球形硬质透气性（RGP）隐形眼镜验光的诺模图。方法：回顾性分析1995年4月至2002年3月在博士伦公司在博士伦公司的隐形眼镜中心接受RGP隐形眼镜试验的24例经诊断为PMCD的患者的病历。印度海德拉巴的Prasad眼科研究所。收集的数据包括患者的年龄和性别，出现症状的持续时间，相关的眼部状况，出现的视敏度和散光程度。为了分析的目的，散光被分为四组：第一组，屈光度小于5.00（D）;第二组屈光度小于5.00。第2组，5.00至10.00D;第3组，10.00至15.00D;和第4组，15.00至20.00D。分析最终的晶状体参数，患者的舒适度和随访时间。结果：在研究期间，24例患者的40只眼配戴了RGP隐形眼镜。男性患者16例，女性患者8例。患者年龄为13至59岁，平均35.5岁。 22例（91.7％）患者的典型PMCD较低，而其他2例（8.3％）的PMCD较高。第一组的平均角膜曲率分别为7.1 mm（范围5.9-7.8 mm），第二组的6.9 mm（范围6.6-7.9 mm），第三组的7.5 mm（范围6.5-7.8 mm）和7.9 mm第4组（6.8-7.8毫米）（范围在6.8-7.8毫米范围内）。第1组最终合镜的平均基础曲线是6.3毫米（5.7-7.8毫米范围），在第2组是6.8毫米（范围5.9-7.8毫米）。第三组为7.5毫米（范围为6-8.2毫米），第四组为7.2毫米（范围为6.6-7.8毫米）。最后一个试戴镜的平均镜片直径为8.7毫米（范围为8.6-10.6毫米）。第1组，第2组为9.5 mm（范围8.8-10.5 mm），第3组为10.2 mm（范围8.8-11.5 mm），第4组为10.4 mm（范围8.8-11.3 mm）。常见的荧光素图形是中枢性触觉，中部周围合并为14个（35％），哑铃模式为七个（17.％）。在四个散光组中，使用RGP镜片的最终视力范围在第1组为20/40至20/20，在第2组为20/30至20/20，在第3组为20/40至20/20，而在第20组为20在第4组中，从/ 200到20 /50。21例患者对RGP晶状体感到舒适，平均随访时间为13个月。三例患者停止配戴眼镜。一名患者的晶状体不稳定，另两名患者的晶状体不适。结论：即使是晚期PMCD患者，球形硬质透气性镜片也是不错的选择。在散光度小于10D的患者中，基本曲线为6.0至7.0 mm，直径为8.0至9.5 mm的晶状体似乎是进行试验的良好初始镜片，对于散光度大于10D的患者，晶状体基本曲线为7.0至7.5毫米，直径为10.0至10.5毫米，似乎是一个很好的初始镜头。

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