Journal of The British Contact Lens Association最新文献_第9页

Disposable contact lenses: a review 一次性隐形眼镜:回顾

Journal of The British Contact Lens Association Pub Date : 1994-01-01 DOI: 10.1016/S0141-7037(94)80003-0

BSc, FBCO, DCLP, Dorth, FAAO Lyndon Jones

{"title":"Disposable contact lenses: a review","authors":"BSc, FBCO, DCLP, Dorth, FAAO Lyndon Jones","doi":"10.1016/S0141-7037(94)80003-0","DOIUrl":"10.1016/S0141-7037(94)80003-0","url":null,"abstract":"<div><p>The introduction of hydrogel lenses into clinical practice in the early 1970s resulted in a rapid increase in the number of patients being fitted with contact lenses, the improved oxygen performance, wearing times and comfort compared with the polymethylmethacrylate (PMMA) lenses being fitted at that time giving rapid market growth.</p><p>However, both patients and practitioners quickly began to realise that soft lenses were far from being the ‘perfect contact lens’ and were not without their own complications. Their durability was far less than that of PMMA lenses, the solution systems were considerably more complex and expensive than initially envisaged and hitherto rarely encountered complications, such as neovascularisation and papillary conjunctivitis, became major concerns.</p><p>The development of high water content soft lenses solved some of the problems concerning oxygenation, but these lenses were even more prone to breakage and deposition. Attempts to overcome these problems have resulted in the development of planned replacement and disposable systems, which have been widely accepted by practitioners.</p><p>This paper reviews the literature on disposable lenses, particularly when used on a daily-wear basis.</p></div>","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"17 2","pages":"Pages 43-49"},"PeriodicalIF":0.0,"publicationDate":"1994-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(94)80003-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74374729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Concentric-design rigid bifocal lenses, part III: predicting vision from optical measurement 同心设计刚性双焦点透镜，第三部分:从光学测量预测视觉

Journal of The British Contact Lens Association Pub Date : 1994-01-01 DOI: 10.1016/S0141-7037(94)80004-9

PhD, BOptom, MBCO, FAAO Russell L. Woods , PhD John E. Saunders, MSc, DCLP, FBCO, FAAO Michael J.A. Port

{"title":"Concentric-design rigid bifocal lenses, part III: predicting vision from optical measurement","authors":"PhD, BOptom, MBCO, FAAO Russell L. Woods , PhD John E. Saunders, MSc, DCLP, FBCO, FAAO Michael J.A. Port","doi":"10.1016/S0141-7037(94)80004-9","DOIUrl":"10.1016/S0141-7037(94)80004-9","url":null,"abstract":"<div><p>While the main purpose of previous optical investigations of contact lenses has been to elucidate the effects of differences in design, there have been no previous reports of measurements of both optical performance and visual performance of the same contact lenses. In this study optical and visual results were compared and models developed to predict visual performance from the optical performance measurements of rigid concentric-design bifocal contact lenses. Optical performance was measured using an EROS solid state modulation transfer function (MTF) system with apertures of 2 to 6mm and contact lens decentration of 0 to 2mm. Visual performance was measured with a monitor-based contrast sensitivity system, Pelli Robson charts and high and low contrast visual acuity charts. Polymethylmethacrylate (PMMA) bifocal contact lenses were made on a back-surface design in both centre-distance and centre-near designs. Central optic zone diameters varied from 1.8 to 3.4mm, while the peripheral optic zone diameter was fixed at 75mm. Multiple regression analysis models were empirically derived to include the measured pupil diameter, decentration and central optic zone diameter. Best predictions (adjusted multiple correlation, R2: range 0.46–0.80) of visual performance were found with the MTF measurements made with a 4mm aperture. The average measured pupil diameter of the five presbyopic subjects was 2.8mm. These models indicated that the MTF was a useful measure of changes in lens design and that, given the correct conditions of measurement, good predictions of visual performance could be made. Hence, changes in the MTF of bifocal contact lenses are a useful indicator of changes in vision.</p></div>","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"17 2","pages":"Pages 51-57"},"PeriodicalIF":0.0,"publicationDate":"1994-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(94)80004-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83803510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Arthur G. Bennett, FBOA:HD, FBCO Born 20 June 1912 - died 23 March 1994 Arthur G. Bennett, FBOA:HD, FBCO -生于1912年6月20日-逝世于1994年3月23日

Journal of The British Contact Lens Association Pub Date : 1994-01-01 DOI: 10.1016/S0141-7037(94)80034-0

Ronald B. Rabbetts

引用次数: 0

Postscript: informed consent — the UK perspective 附言:知情同意——英国的观点

Journal of The British Contact Lens Association Pub Date : 1994-01-01 DOI: 10.1016/S0141-7037(94)80019-7

Susan Blakeney

引用次数: 0

Addendum to abstracts of the BCIA annual clinical conference — London 1993 1993年伦敦BCIA年度临床会议摘要附录

Journal of The British Contact Lens Association Pub Date : 1994-01-01 DOI: 10.1016/S0141-7037(94)80007-3

引用次数: 0

Leslie Evershed-Martin, CBE, SB, SJ, FBOA (Hons), FSMC Born 25 May 1903 - died Chichester 7 January 1994 莱斯利·埃弗舍德-马丁，CBE, SB, SJ, FBOA(荣誉)，FSMC生于1903年5月25日- 1994年1月7日卒于英国奇切斯特

Journal of The British Contact Lens Association Pub Date : 1994-01-01 DOI: 10.1016/S0141-7037(94)80035-9

Michael Palmer

引用次数: 0

Informed consent for contact lens patients 隐形眼镜患者的知情同意

Journal of The British Contact Lens Association Pub Date : 1994-01-01 DOI: 10.1016/S0141-7037(94)80022-7

OD, JD, MS Michael G. Harris

引用次数: 1

Fitting therapeutic softperm contact lenses in the event of corneal pathology with highly irregular astigmatism 在角膜病理高度不规则散光的情况下，适合治疗性软性隐形眼镜

Journal of The British Contact Lens Association Pub Date : 1994-01-01 DOI: 10.1016/S0141-7037(94)80005-7

Willem Vreugdenhil , Wilhelmina J. Rijneveld , Fred A.G.J. Eggink

引用次数: 7

Contact lens opacity grading system (CLOGS) 隐形眼镜透明度分级系统(CLOGS)

Journal of The British Contact Lens Association Pub Date : 1994-01-01 DOI: 10.1016/S0141-7037(94)80013-8

BSc, PhD, FBCO, FAAO Mark A. Hurst, BSc, MBCO Stewart E. Mitchell, MSc, PhD, FBCO, DCLP William A. Douthwaite

{"title":"Contact lens opacity grading system (CLOGS)","authors":"BSc, PhD, FBCO, FAAO Mark A. Hurst, BSc, MBCO Stewart E. Mitchell, MSc, PhD, FBCO, DCLP William A. Douthwaite","doi":"10.1016/S0141-7037(94)80013-8","DOIUrl":"10.1016/S0141-7037(94)80013-8","url":null,"abstract":"<div><p>Grading and classification systems have been used in contact lens research for many years, despite a lack ofstandardisation. A new system for classifying the type of contact lens deposit and assessing its extent is presented. It makes use of five standard photographs for direct comparison purposes and allows decimal interpolation between grades. A further five photographs are included to allow differential identification of artefacts, scratches and spot deposits. This paper presents both intraobserver (coefficients of repeatability ±0.79, ±0.79 and ±0.76; Pearson correlation coefficients 0.94, <em>p</em><0.0001, 0.92, <em>p</em> <0.0001 and 0.91, <em>p</em><0.0001) and interobserver repeatability (coefficients of repeatability ±1.13, ±1.09 and ±1.22; Pearson correlation coefficients 0.86, <em>p</em><0.0001, 0.90, <em>p</em><0.0001 and 0.84, <em>p</em><0.0001) results derived from three observers which demonstrate the reproducible nature of assessments when using this system. We therefore recommend this system for use in longitudinal studies, such as efficacy trials of contact lens care systems and clinical procedures involving contact lens deposits.</p></div>","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"17 1","pages":"Pages 19-24"},"PeriodicalIF":0.0,"publicationDate":"1994-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(94)80013-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72591330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

A simple formula for calculating the harmonicaverage oxygen transmissibility of an optically powered RGP contact lens 计算光动力RGP隐形眼镜的谐波平均氧透射率的简单公式

Journal of The British Contact Lens Association Pub Date : 1994-01-01 DOI: 10.1016/S0141-7037(94)80021-9

PhD Irving Fatt, BA Constance M. Ruben

{"title":"A simple formula for calculating the harmonicaverage oxygen transmissibility of an optically powered RGP contact lens","authors":"PhD Irving Fatt, BA Constance M. Ruben","doi":"10.1016/S0141-7037(94)80021-9","DOIUrl":"10.1016/S0141-7037(94)80021-9","url":null,"abstract":"<div><p>The harmonic average oxygen transmissibility is a useful predictor of the performance of a rigid gas permeable(RGP) lens. Translation of the lens at each blink mixes the postlens tear film. The amount of oxygen diffusing through different parts of the lens must therefore be averaged to arrive at the amount of oxygen available to the cornea by the diffusion process. When the contact lens has optical power outside the range -3D to +3D, an average process must be applied to the annular zones of different thickness. Campbell's formula for point-to-point lens thickness can be manipulated by the methods of calculus to arrive at a simple formula that gives harmonic average oxygen transmissibility. The formula requires only centre thickness, diameter of the optical zone, optical power, and refractive index. These quantities are used to generate a table of harmonic average oxygen transmissibilities for a variety of RGP lenses. The table shows that harmonic average oxygen transmissibility varies less with optical power than does oxygen transmissibility based on centre thickness. The clinical implication is that oxygen supply to the cornea will not be sensitive to the optical power of the lens.</p></div>","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"17 4","pages":"Pages 115-118"},"PeriodicalIF":0.0,"publicationDate":"1994-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(94)80021-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76096893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6