Extended Wear Silicone Contact Lenses in Children with Cataracts

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.     

Current Australian Contact Lens Practice*

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.     

Clinic study on silicone hydrogel contact lenses used as bandage contact lenses after LASEK surgery

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.     

圆锥角膜患者使用Rose K2软性角膜接触镜的临床表现

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.     

Contact lens practice in Australia 1988–1989

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.     

亲水性软性角膜接触镜所致角膜新生血管临床观察

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。     

A clinical comparison of the Johnson & Johnson Acuvue,the Barnes-Hind Calendar and the Bausch & Lomb Medalist disposable contact lenses

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.     

Computer-aided design of hydrophilic contact lenses

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.     

Silsoft extended wear contact lenses in pediatric aphakia

Fifty pediatric aphakic patients, ranging in age from 7 days to 11 years, were fitted with the Silsoft extended wear contact lens. Compared to other extended wear lenses, the Silsoft lens has several advantages. These include easier handling, a less traumatic fitting procedure for the child, the use of fluorescein for evaluation of the lens-cornea relationship and a low loss rate. This lens appears to be safe, with no permanent adverse effects on the cornea.     

Contact lens practice in Australia 1987–1988

Contact lens practitioners were surveyed in September 1988 on their prescribing patterns, use of care solutions and attitudes to extended wear (EW). During the period July 1, 1987 to June 30, 1988, the responding practitioners prescribed an average of 95 new pairs of contact lenses and provided an average of 96 pairs of replacement lenses. Thirty-eight per cent of fittings were refits, 80 per cent of lenses prescribed were soft lenses, 25 per cent and 12 per cent of soft and hard lenses respectively were toric, and 39 per cent and 87 per cent of soft and hard lenses respectively were tinted. Hydrogen peroxide was the most popular method for disinfecting soft lenses. Over 85 per cent of the respondents were prepared to fit contact lenses for EW use under certain circumstances, but only 15 per cent of all lenses prescribed were for any type of EW. Over 90 per cent of lenses prescribed for EW were soft. The most commonly recommended frequency for regular EW lens replacement was six-monthly and the mean number of nights of overnight wear recommended by the practitioners was 4.5 nights per week.     

Acanthamoeba keratitis related to cosmetic contact lenses

We report a rare case of Acanthamoeba keratitis related to cosmetic contact lenses in both eyes. A 17-year-old girl with a history of wearing cosmetic contact lenses presented with keratitis. She purchased cosmetic contact lenses via the Internet, and followed a contact lens care system irregularly, occasionally using tap water. Cell culture was performed on samples collected from a corneal scraping, the contact lenses and the storage cases. The isolated organism was Acanthamoeba. The patient was treated with polyhexamethylene biguanide and chlorhexidine for 3 months, and recovered with normal visual acuity. Poor hygiene and insufficient disinfection may be major risk factors for Acanthameoba keratitis in cosmetic contact lens wearers. The cosmetic contact lens user should receive professional advice before accessing the lenses, and this must be communicated to the public.     

Contact lens compliance amongst soft contact lens users

目的:从卫生和镜片、镜片盒及镜片护理液的更换来调查隐形眼镜配戴者的依从性.方法:以每天配戴镜片至少8h、持续配戴≥6mo的隐形眼镜配戴者为研究对象.采用半结构化、经过预先测试和验证的问卷调查表,在接受口头知情同意后评估软性隐形眼镜配戴者的依从性.每位受试者都接受访问,收集有关戴隐形眼镜使用历史的信息.年龄、性别、使用的镜片类型、配戴经验(a)、配戴时间和习惯、一天中持续使用镜片的时间和护理方法的细节都进行了记录.结果:共73名参与者的平均年龄为23.63±5.23y.观察到:依从性最高的项目为镜片清洁和消毒程序(98%);依从性最低的是隐形眼镜配件护理(81%).依从性较差的是:更换镜片盒(41%),检查并丢弃过期的护理液(22%)和未能进行后续随访(22%).镜片配戴的性别、配戴方式、配戴类型以及隐形眼镜使用年限依从性间无统计学差异.结论:这项研究结果证明总体上配戴者依从性良好.然而,在隐形眼镜盒和护理液等镜片配件的护理中,存在一定程度的不遵嘱执行.我们认为有必要考虑改善镜片护理操作依从性的方法.     

Ocular Discomfort at the Initial Wearing of Rigid Gas Permeable Contact Lenses

Purpose To evaluate the relationship between ocular discomfort in the initial wearing of rigid gas permeable contact lenses (RGPCL) and the time required to adapt to RGPCL as measured by using the visual analogue scale (VAS).Methods RGPCL were prescribed for 89 patients (178 eyes) with myopia or myopic astigmatism and no history of wearing contact lenses. The patients who stopped wearing RGPCL after 1 week because of ocular discomfort were defined as dropouts, and those who adapted to regular full-time RGPCL wear were defined as successful wearers. VAS scores were measured at several intervals for 1 month after the initial wearing of the lenses. The number of days required to adapt to wearing RGPCL was defined as the adaptation time.Results Four patients were dropouts due to ocular discomfort (eight eyes; 4.5%). VAS scores were significantly lower in successful wearers than in dropouts at 1 week, although their VAS scores were not different at 1 day. VAS scores of the successful wearers at 1 week were significantly lower than those at 1 day. The average time required to adapt to RGPCL was 23.0 ± 22.1 days for the 85 successful wearers. Lower VAS scores at 1 day or 1 week were significantly correlated with a shorter adaptation time in the successful RGPCL wearers.Conclusions Our results indicate that the VAS score might be useful for predicting successful RGPCL use and the adaptation time required by successful wearers. Jpn J Ophthalmol 2004;48:376–379 © Japanese Ophthalmological Society 2004     

软性虹彩片联合透气性半硬性角膜接触镜矫治外伤性无虹膜无晶状体眼

目的 评价软性虹彩片联合透气性半硬性角膜接触镜(RGPCL)对外伤性无虹膜无晶状体眼的矫治效果.设计回顾性病例系列.研究对象 角膜内皮细胞密度在2500个/mm2以上外伤性无虹膜无晶状体眼患者59例(59眼).方法患者联合戴用软性虹彩片和RGPCL,比较初诊时的插片视力和RGPCL矫正视力,随诊5年,非接触性角膜内皮计...     

眼科成像设备在接触镜适配中的应用

接触镜在全球的应用日益广泛,配适方法的不断进步是目前接触镜安全性、舒适性不断提高的原因之一。在接触镜适配过程中,越来越多的先进影像技术被运用于指导接触镜的配适,这些技术的出现简化了接触镜适配的过程,为临床医生进行简便、准确、个性化的接触镜适配提供了帮助,也为接触镜的个性化设计提供了参考数据。     

美容性角膜接触镜的验配探讨

目的：为各种角膜白斑、虹膜异常的病人寻求医学美容及保留有用视力。方法Ｚ：对各种角膜白斑、虹膜异常的病人按有用视力和无用视力。分别进行有孔和无孔美容性角膜接触镜（俗称美容镜）的配戴。与健眼的虹膜色泽、瞳孔大小、舍适程度、配戴前后有用视力的评估。进一步统计分析探讨。结果：共收集４３０眼美容镜配戴者,有用视力的角膜旁中央白斑戴有孔美容镜４３眼,视力范围在眼前指数至０．６之间,戴镜前后的有用视力基本保持不变;无用视力的各种角膜白斑戴无孔美容镜３８７眼,能有效遮盖白斑,起到角膜美容的作用。结论：（１）各种角膜白斑的医学美容应首选配戴美容性隐形眼镜,既可逆性,又经济、安全、有效。（２）有孔美容镜既能有效遮盖角膜旁中央白斑,又能保留有用视力,两全其美。     

A prosthetic,prism ballasted soft lens for traumatically induced corectopia,heterochromia and corneal scarring

A case describing the fitting of a tinted contact lens to mask ocular disfigurement is presented. The initial injury and sequelae are outlined, followed by the steps taken to modify the appearance including different tint types, depth and position. It is possible to provide some degree of normalcy in appearance with this type of cosmetic contact lens.