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1.
Thirty-two patients, ranging in age from three weeks to 22 years, were fitted with an extended wear 100% silicone lens. The longest period of time a lens remained in the eye without being removed was 120 days. Most lenses were worn an average of six weeks before cleaning was required. No cases of infection or corneal edema were observed that required discontinuing use of the lens.  相似文献   

2.
ABSTRACT: A survey was sent to 572 contact lens practitioners in order to ascertain trends in Australian contact lens practice. Replies were obtained from 134 optometrists and 8 ophthalmologists. The results indicate a resurgence of interest in soft lenses, a high usage of toric soft lenses, a dramatic reduction in PMMA usage and an increase in the use of gas permeable lenses. Possible reasons for these apparent trends are discussed.  相似文献   

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AIM: To compare the clinical performance of two types of silicon hydrogel contact lenses used as bandage lenses after LASEK surgery. METHODS: A prospective, double-masked study was conducted on 42 eyes of 21 patients who received binocular LASEK surgeries. The interocular difference in spherical equivalent power was less than -1.50D. Patients were randomly assigned to wear Galyfilcon A (Lens A) bandage contact lens in one eye and Balafilcon A (Lens B) in the fellow eye after the surgery. The responses to a subjective questionnaire on comfort of wearing, corneal epithelial status, conjunctival hyperemia, limbal neovascularization, lens fitting and contact lens debris were assessed 1 and 5 days postoperatively. Corneal endothelium was assessed before and 5 days after the surgery upon bandage lens removal. RESULTS: There was no difference between the two groups in terms of conjunctival hyperemia, limbal neovascularization, contact lens fitting, corneal epithelial status, corneal endothelium cell density (CD) and endothelium cell size (CS) at any postoperative visit. Complaints of discomfort, including foreign body sensation, pain and intolerance were statistically more among Lens B wearers at any postoperative visit (P<0.05). Lens B appeared to attract much more debris than Lens A at the 5-day post-operative follow-up visit (P<0.01). CONCLUSION: The two types of silicon hydrogel lenses investigated in this study demonstrated similar clinical performance in terms of corneal responses and lens fitting. However, Lens A showed a better performance in terms of comfort of wearing and deposit resistance.  相似文献   

4.
Contact lens practitioners completed an annual survey of their prescribing patterns, usage of care solutions and attitudes to extended wear (EW). The survey period was July 1 1988 to June 30 1989 and the results were compared to those of previous, similar surveys. Many results were close to those in previous surveys, including the average number of pairs of lenses prescribed (95 new, 30 replacement), the proportion of contact lens fittings which were refits (40 per cent), the percentage of lenses prescribed which were soft (83 per cent) and the proportions of toric (soft 23 per cent, hard five per cent) and tinted (soft 39 per cent, hard 71 per cent) lenses prescribed. Results which differed markedly from previous surveys included the number of pairs of replacement lenses sold and the percentage of contact lens patients who were presbyopic. More than 90 per cent of lenses prescribed for EW were soft, although approximately 20 per cent of practitioners indicated that they would prefer to fit rigid gas permeable materials for EW. EW lenses were worn only on a true EW basis in six per cent of cases.  相似文献   

5.
目的:评价圆锥角膜患者使用Rose K2软性角膜接触镜的舒适度及视觉表现.方法:横断面研究.50例患者(50眼)接受全面的眼科检查,包括屈光度、裸眼视力(UCVA)、最佳矫正视力(BCVA)、裂隙灯显微镜及眼底检查、泪膜破裂时间(BUT)、角膜地形图和对比敏感度.戴镜后,测量最佳戴镜矫正视力(BCLCVA)、对比敏感度及舒适度通过平均视觉模拟量(VAS)呈现.结果:患者平均年龄为26.2依6.0 (16 ~39) y.使用Rose K2软性角膜接触镜 UCVA,BCVA,和 BCLCVA 的平均logMAR值依次为0.61依0.37 (0.15 ~1.3),0.42依0.32 (0~1.3) 和0.18依0.20 (0 ~1.3).使用接触镜后视敏度显著提高(P<0.05),在明视和暗视条件下,对比敏感度数值明显增加(P<0.05).Rose K2软性角膜接触镜的视觉模拟量(VAS)值为8.02依1.64(5~10).结论:圆锥角膜患者使用Rose K2软性角膜接触镜能够改善视力,对比敏感度以及舒适度.  相似文献   

6.
本文观察了因配戴软性亲水性角膜接触镜而产生角膜新生血管的33例59眼,对角膜新生血管的发病机制进行了探讨,指出角膜新生血管的发生与戴镜年限、连续戴镜时间、角膜与镜片的匹配有密切关系,对于此并发症的治疗采用停戴接触镜取得较好效果。  相似文献   

7.
We compared the clinical performacne of three brands of disposable contact lenses availble in Australia by refitting 82 Johnson & Johnson Acuvue wearers with either Barnes-Hind Calendar or Bausch & Lomb Medalist lenses. Subjective lens assessments were analysed with regard to patient factors. Many of these factors wer not significant for predicting the success of a lens but overall lens preference and preference on the basis of comfort, handling and quality of vision were predictable from a history of keratitis, wearing mode or lens power. However, High individual variations did occur. Fitting success is imporved by following some simple guidelines but is maximised obly by trialing more than one lens type.  相似文献   

8.
This paper discusses the problems of visualizing new contact lens designs. We have developed computer-aided design (CAD) software that greatly improves lens visualization: this is illustrated for a spherical hydrophilic lens. Designers have the options of displaying magnified cross-sections of any part of the lens, making detailed measurements of these cross-sections, and displaying colour-coded three-dimensional views of the lens surfaces. Future developments are discussed.  相似文献   

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