The oxygen permeability of 28 currently available rigid contact lens materials was measured using the polarographic method, and the data were corrected for boundary and edge effects. Comparison of the measured oxygen permeability values with data supplied by manufacturers (nominal data) reveals a large discrepancy, whereby the measured values are less than the quoted values. This may be attributed to either (a) the manufacturers citing values derived from techniques other than the polarographic method (such as the coulometric technique), or (b) the manufacturers citing values derived earlier that have not been corrected for the edge or boundary effects. Practitioners should continue to exercise caution when interpreting oxygen transmissibility data.
{"title":"Oxygen permeability of rigid contact lens materials","authors":"Dip Optom, MSc Ioannis Tyanoudis, BSc Optom, PhD, FARO, FVCO, MBCO Nathan Efyon","doi":"10.1016/S0141-7037(95)80032-8","DOIUrl":"10.1016/S0141-7037(95)80032-8","url":null,"abstract":"<div><p>The oxygen permeability of 28 currently available rigid contact lens materials was measured using the polarographic method, and the data were corrected for boundary and edge effects. Comparison of the measured oxygen permeability values with data supplied by manufacturers (nominal data) reveals a large discrepancy, whereby the measured values are less than the quoted values. This may be attributed to either (a) the manufacturers citing values derived from techniques other than the polarographic method (such as the coulometric technique), or (b) the manufacturers citing values derived earlier that have not been corrected for the edge or boundary effects. Practitioners should continue to exercise caution when interpreting oxygen transmissibility data.</p></div>","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"18 2","pages":"Pages 49-53"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(95)80032-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88287830","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}
Pub Date : 1995-01-01DOI: 10.1016/S0141-7037(95)80042-5
PhD, FIBiol John Hay , MD, FRCPath, FRCOphth David V. Seal , BSc Ruth Connor , PhD Peter A. Simmons , PhD Alan Tomlinson
Sets of 16 quarter segments of ionic, high-water content hydrogel contact lenses were incubated with mature cysts of Acanthamoeba castellanii. Lens pieces with associated amoebae were then incubated overnight at 25°C with one of the following: Prymesoak, Sofab, 10.10, ReNu, Optifree or sterile isotonic saline. Other lens pieces were sonicated at a frequency of 110 cycles/sec for 5 min in one of these systems or sonicated and then incubated overnight in the disinfectant. Subsequent culture for amoebal viability indicated that only Prymesoak and 10:10 provided 100% efficacy of action against lens-associated Acanthamoeba cysts, but Prymesoak required overnight incubation for such an effect. Sonication before incubation did not significantly improve the acanthamoebicidal properties of the disinfecting systems.
{"title":"Disinfection and sonication: Effect on association of Acanthamoeba cysts with an ionic, high-water content hydrogel contact lens","authors":"PhD, FIBiol John Hay , MD, FRCPath, FRCOphth David V. Seal , BSc Ruth Connor , PhD Peter A. Simmons , PhD Alan Tomlinson","doi":"10.1016/S0141-7037(95)80042-5","DOIUrl":"10.1016/S0141-7037(95)80042-5","url":null,"abstract":"<div><p>Sets of 16 quarter segments of ionic, high-water content hydrogel contact lenses were incubated with mature cysts of <em>Acanthamoeba castellanii</em>. Lens pieces with associated amoebae were then incubated overnight at 25°C with one of the following: Prymesoak, Sofab, 10.10, ReNu, Optifree or sterile isotonic saline. Other lens pieces were sonicated at a frequency of 110 cycles/sec for 5 min in one of these systems or sonicated and then incubated overnight in the disinfectant. Subsequent culture for amoebal viability indicated that only Prymesoak and 10:10 provided 100% efficacy of action against lens-associated <em>Acanthamoeba</em> cysts, but Prymesoak required overnight incubation for such an effect. Sonication before incubation did not significantly improve the acanthamoebicidal properties of the disinfecting systems.</p></div>","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"18 1","pages":"Pages 5-8"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(95)80042-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75252006","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}
Pub Date : 1995-01-01DOI: 10.1016/S0141-7037(95)80018-2
{"title":"Contact lens diary","authors":"","doi":"10.1016/S0141-7037(95)80018-2","DOIUrl":"https://doi.org/10.1016/S0141-7037(95)80018-2","url":null,"abstract":"","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"18 3","pages":"Page 105"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(95)80018-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137286485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-01-01DOI: 10.1016/S0141-7037(95)80051-4
{"title":"Subject index, volume 17 (1994)","authors":"","doi":"10.1016/S0141-7037(95)80051-4","DOIUrl":"https://doi.org/10.1016/S0141-7037(95)80051-4","url":null,"abstract":"","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"18 1","pages":"Page 36"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(95)80051-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136594882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-01-01DOI: 10.1016/S0141-7037(95)80026-3
{"title":"Flashback London 1995","authors":"","doi":"10.1016/S0141-7037(95)80026-3","DOIUrl":"https://doi.org/10.1016/S0141-7037(95)80026-3","url":null,"abstract":"","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"18 4","pages":"Pages 143-144"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(95)80026-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137009930","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}
Pub Date : 1995-01-01DOI: 10.1016/S0141-7037(95)80048-4
{"title":"Obituary","authors":"","doi":"10.1016/S0141-7037(95)80048-4","DOIUrl":"https://doi.org/10.1016/S0141-7037(95)80048-4","url":null,"abstract":"","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"18 1","pages":"Page 33"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(95)80048-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137155976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-01-01DOI: 10.1016/S0141-7037(95)80029-8
{"title":"Photo-atlas","authors":"","doi":"10.1016/S0141-7037(95)80029-8","DOIUrl":"https://doi.org/10.1016/S0141-7037(95)80029-8","url":null,"abstract":"","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"18 4","pages":"Pages 147-148"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(95)80029-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91955563","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}
Pub Date : 1995-01-01DOI: 10.1016/S0141-7037(95)80013-1
BOptom Pauline Cho (Member of Faculty) , PhD, FAAO, MBCO Maurice Yap (Member of Faculty)
Chinese subjects living in Hong Kong (HK-Chinese) were recruited in order to investigate the effect of soft contact lens wear on tear stability and quantity. All subjects were asymptomatic and non-contact lens wearers. The tests used for tear stability were the tear break-up time (TBUT) test and a non-invasive tear break-up time (NITBUT) test; for tear quantity, the Schirmer test (ST) and a modified cotton thread test (CTT) were used. Measurements were taken before and after various periods of contact lens wear. Inconsistent changes in the pre-lens tear film (PLTF) stability were observed. There was no association between corneal staining and low PLTF stability. Soft contact lens wear caused a significant initial transient decrease in the tear stability but no changes in tear quantity. The median NITBUT and TBUT before soft contact lens wear were 9.7s and 4.0s respectively. After 28 weeks of daily soft contact lens wear, the median NITBUT was 5.6s and TBUT was 6.2s. The mean (± SD) CTT value was 23.2 (±11.2) mm/min before soft contact lens wear and 19.4 (±14.0) mm/min after 28 weeks of daily soft contact lens wear. NITBUT and TBUT tests do not appear to identify which patients would have potential problems with contact lens wear whereas CTT values appear to predict subjects most likely to be successful soft contact lens wearers.
{"title":"Effect of contact lens wear on the tears of Hong Kong-Chinese","authors":"BOptom Pauline Cho (Member of Faculty) , PhD, FAAO, MBCO Maurice Yap (Member of Faculty)","doi":"10.1016/S0141-7037(95)80013-1","DOIUrl":"10.1016/S0141-7037(95)80013-1","url":null,"abstract":"<div><p>Chinese subjects living in Hong Kong (HK-Chinese) were recruited in order to investigate the effect of soft contact lens wear on tear stability and quantity. All subjects were asymptomatic and non-contact lens wearers. The tests used for tear stability were the tear break-up time (TBUT) test and a non-invasive tear break-up time (NITBUT) test; for tear quantity, the Schirmer test (ST) and a modified cotton thread test (CTT) were used. Measurements were taken before and after various periods of contact lens wear. Inconsistent changes in the pre-lens tear film (PLTF) stability were observed. There was no association between corneal staining and low PLTF stability. Soft contact lens wear caused a significant initial transient decrease in the tear stability but no changes in tear quantity. The median NITBUT and TBUT before soft contact lens wear were 9.7s and 4.0s respectively. After 28 weeks of daily soft contact lens wear, the median NITBUT was 5.6s and TBUT was 6.2s. The mean (± SD) CTT value was 23.2 (±11.2) mm/min before soft contact lens wear and 19.4 (±14.0) mm/min after 28 weeks of daily soft contact lens wear. NITBUT and TBUT tests do not appear to identify which patients would have potential problems with contact lens wear whereas CTT values appear to predict subjects most likely to be successful soft contact lens wearers.</p></div>","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"18 3","pages":"Pages 87-94"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(95)80013-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88565847","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}
Pub Date : 1995-01-01DOI: 10.1016/S0141-7037(95)80031-X
Tony L. Harknett
{"title":"Clinical records in contact lens practice","authors":"Tony L. Harknett","doi":"10.1016/S0141-7037(95)80031-X","DOIUrl":"10.1016/S0141-7037(95)80031-X","url":null,"abstract":"","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"18 2","pages":"Pages 41-47"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(95)80031-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81016619","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}
Pub Date : 1995-01-01DOI: 10.1016/S0141-7037(95)80036-0
{"title":"BCLA news","authors":"","doi":"10.1016/S0141-7037(95)80036-0","DOIUrl":"https://doi.org/10.1016/S0141-7037(95)80036-0","url":null,"abstract":"","PeriodicalId":100842,"journal":{"name":"Journal of The British Contact Lens Association","volume":"18 2","pages":"Pages 73-75"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0141-7037(95)80036-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137256956","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}
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