方法:通过睫状肌麻痹检影验光及光学生物测量仪(IOL-Master)获得44例88眼的屈光不正度数、眼轴、角膜屈光力、前房深度等参数,经计算得到晶状体度数。按屈光不正度数分为远视组、正视组、近视组,直线相关与回归比较年龄和屈光不正与各屈光参数之间的关系。
结果:受试者44例88眼,平均年龄9.04±2.39岁,等效球镜(SE)-3.50~+8.75D; 远视组眼轴比近视正视组短(P<0.05),远视组晶状体屈光力明显低于近视正视组(P<0.05),三组间角膜屈光力和前房深度无明显差别。本研究发现年龄与等效球镜(SE)之间成负相关; 眼轴与年龄成正相关; 年龄与晶状体屈光力成正相关; SE与眼轴成负相关; SE与晶状体屈光力有负相关关系。
结论:儿童随年龄增长,SE向近视发展,眼轴变长,晶状体屈光力增强; SE越偏远视,眼轴越短、晶状体屈光力越弱。 相似文献
Aim:
The aim was to evaluate the safety and efficacy of the “cross-cylinder” technique in the correction of astigmatism.Setting and Design:
A prospective interventional study from a university eye department was conducted.Material and Methods:
The photoastigmatic refractive keratectomy (PARK) using the “cross-cylinder” technique was performed in 102 eyes of 84 patients with at least 0.75 D of astigmatism. The study population was divided into two groups: in the first group the preoperative astigmatic power ranged from –0.75 D to –3.00 D (group 1), in the second group it ranged from –3.25 D to –6.00 D (group 2). Group 1 included 82 eyes of 67 patients (29 males and 38 females) with a mean cylinder power of –1.90 ± 0.63 D, group 2 included 20 eyes of 17 patients (13 males and 4 females) with a mean cylinder power of -4.28 ± 0.76 D. All eyes were targeted for emmetropia. The results were evaluated using Calossi''s vector analysis method. Six-month postoperative outcomes are presented.Results:
Six months after PARK the mean sphere for the entire cohort was +0.28 ± 0.75 D (range +2.5 to –2 D), the mean cylindrical power was +0.33 ± 0.51 D (range +2.5 to –1.25 D) and the mean spherical equivalent refraction was +0.73 ± 0.81 D (range +1.75 to –2 D).Conclusions:
The cross-cylinder technique may be safely used with predictable results for the correction of astigmatism. 相似文献Purpose:
To evaluate the safety, efficacy and potential risks of Artiflex foldable iris-fixated phakic intraocular lens (pIOL) implantation for the management of myopia.Materials and Methods:
Seventy-eight eyes of 40 consecutive patients with a mean spherical refraction of –11.70 ± 3.77 diopters (D; range –5.50 to –17.5 D) were included in this prospective, noncomparative, interventional case series. Main parameters assessed were uncorrected visual acuity (UCVA), best-spectacle corrected visual acuity (BSCVA), corneal topography (Orbscan II, BauchandLomb, Rochester, NY, USA), manifest and cycloplegic refractive errors, endothelial cell density (ECD) and applanation tonometry.Results:
After 2 years, BSCVA was 20/40 or better in 82% of the eyes and UCVA was 20/40 or better in 84% of the eyes. After 1 month, 1 year, and 2 years, 51.3% (37 of 72 eyes), 58.9% (46 of 78 eyes) and 76.0% (38 of 50 eyes) of eyes gained 1 line or more of BSCVA, respectively. Compared to preoperative values, the mean endothelial cell loss was 2.6% at 1 month, 4.9% at 1 year and 7.4% at 2 years. Pigmented or non-pigmented precipitates were observed in17 eyes (21.7%) which were treated with topical corticosteroids. At the second postoperative year, pigmented precipitates persisted in nine eyes. However, this was not associated with a loss of BSCVA.Conclusion:
The implantation of Artiflex pIOL is an effective surgical option for the management of high myopia. The most common complication observed within 2 years of follow-up was accumulation of pigmented precipitates with no effect on the final BSCVA. 相似文献目的:调查分析海军某部连续远航舰员视疲劳状况,探究与视疲劳发生相关的危险因素并构建视疲劳预测决策树模型。
方法:采用分层随机抽取方式选取2016-07/10海军某舰队参加远航任务舰员373名。通过询问受试者病史、个人基本情况,检查裸眼视力、最佳矫正视力、 裂隙灯检查包括:眼睑、睑缘、睑板腺改变、角膜及结膜是否存在眼表损害体征,并行角膜荧光素染色,确定泪膜破裂时间(BUT)。填写眼表疾病分析量表(OSDI)和视疲劳调查表,统计受试者眼部疲劳发生率及严重程度,分析视疲劳发生危险因素。
结果:纳入受试者373名中 63.0%(235名)舰员存在不同程度的视疲劳状况。其中视疲劳发生与性别、年龄及既往角膜屈光手术史无相关性(P>0.05); 存在干眼主观症状及电子屏幕暴露时长是其发生的危险因素(P<0.01)。相关危险因素构建CHAID决策树模型,总体预测准确率为76.9%。
结论:连续航行舰员中存在干眼主观症状,电子屏幕暴露时长是舰员发生视疲劳的危险因素。 相似文献
角膜屈光手术是指通过角膜手术矫正近视、远视以及散光等屈光不正的方法,临床上经常可以见到术后屈光回退的现象,即手术后又发生了屈光不正。屈光不正以及手术导致的欠佳的视觉质量经常会给患者带来困扰。截止目前,不同种类以及方式的角膜屈光手术均存在屈光回退的问题。目前认为角膜屈光手术后发生的屈光回退主要和角膜上皮增厚以及角膜生物力学改变相关。屈光回退可以在术前通过患者的手术条件以及手术相关参数等危险因素进行预测和规避,同时也可以通过选择合适的手术方式和药物方法进行预防。对于已经发生的屈光回退可选择非手术方法以及增效手术方法进行处理。 相似文献