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首页> 外文期刊>British journal of ophthalmology >Pellucid marginal corneal degeneration: evaluation of the corneal surface and contact lens fitting.
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Pellucid marginal corneal degeneration: evaluation of the corneal surface and contact lens fitting.

机译：透明边缘性角膜变性：角膜表面和隐形眼镜验配的评估。

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摘要

AIM: To quantify corneal irregularities, to describe the fitting with contact lenses, and to answer the question whether or not contact lenses with a special back surface design could improve visual acuity in patients with pellucid marginal corneal degeneration (PMCD). METHODS: 13 eyes were fitted with contact lenses with a special back surface. Videokeratographic data were assessed. The patients were followed up for an average period of 22.2 months. Lens tolerance and corrected visual acuity were evaluated. RESULTS: The mean eccentricity did not exceed 0.7 in all patients. Either the superior or the inferior eccentricity, or both, were negative in all patients. Using Fourier analysis all PMCD subjects showed an increased irregular astigmatism of the anterior cornea. Using Zernike coefficients seven eyes (53.8%) had a higher order aberration root mean square error (HOA RMS error) out of the normal range. The visual acuity with contact lenses improved in all eyes with an average increase of 2.7 lines (maximum eight lines). No serious complications were observed. CONCLUSIONS: Quantitative evaluation of videokeratographic data may help to diagnose PMCD and to distinguish PMCD from other ectatic corneal diseases. Contact lenses with a special back surface design can improve visual acuity and lens tolerance.
机译：目的：为了量化角膜不规则性，描述与隐形眼镜的配合，并回答具有特殊背面设计的隐形眼镜是否可以改善透明边缘性角膜变性（PMCD）患者的视敏度。方法：13只眼睛配有特殊背面的隐形眼镜。评估了视频角膜成像数据。对患者平均随访22.2个月。评估镜片的耐受性和矫正视力。结果：所有患者的平均离心率均不超过0.7。在所有患者中，上偏心率或下偏心率或两者均为阴性。使用傅立叶分析，所有PMCD受试者均显示前角膜不规则散光增加。使用Zernike系数，七只眼睛（53.8％）的色差均方根误差（HOA RMS误差）更高，在正常范围之外。隐形眼镜的视力在所有眼睛中均得到改善，平均增加了2.7行（最多八行）。没有观察到严重的并发症。结论：视频角膜成像数据的定量评估可能有助于诊断PMCD并将PMCD与其他直肠角膜疾病区分开。具有特殊背面设计的隐形眼镜可以提高视力和镜片耐受性。

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