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Intraocular lens power calculation in eyes with previous corneal refractive surgery

Eye and Vision 2018年第1期5卷 172-181页

作者： giacomo savini Kenneth J.Hoffer G.B.Bietti Eye Foundation RomeItaly. Stein Eye Institute University of CaliforniaLos AngelesCAUSA.3 St.Mary’s Eye CenterSanta MonicaCAUSA

Background:This review aims to explain the reasons why intraocular lens(IOL)power calculation is challenging in eyes with previous corneal refractive surgery and what solutions are currently available to obtain more accurate ***:After IOL implantation in eyes with previous LASIK,PRK or RK,a refractive surprise can occur because (i)the altered ratio between the anterior and posterior corneal surface makes the keratometric index invalid;(ii)the corneal curvature radius is measured out of the optical zone;and (iii)the effective lens position is erroneously predicted if such a prediction is based on the post-refractive surgery corneal *** methods are currently available to obtain the best refractive outcomes in these eyes,even when the perioperative data(*** corneal power and surgically induced refractive change)are not *** this review,we describe the most accurate methods based on our clinical ***:IOL power calculation after myopic corneal refractive surgery can be calculated with a variety of methods that lead to relatively accurate outcomes,with 60 to 70%of eyes showing a prediction error within 0.50 diopters.

关键词： Cataract Intraocular lens power LASIK PRK Excimer laser Corneal surgery Keratometry

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Effect of orthokeratology on precision and agreement assessment of a new sweptsource optical coherence tomography biometer

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Eye and Vision 2020年第1期7卷 119-127页

作者： Bao Shu Fangjun Bao giacomo savini Weicong Lu Ruixue Tu Haisi Chen Benhao Song Qinmei Wang Jinhai Huang School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical University270 West Xueyuan RoadWenzhou 325027ZhejiangChina Key Laboratory of Vision Science Ministry of HealthWenzhouZhejiangPeople’s Republic of China G.B.Bietti Foundation IRCCS RomeItaly

Background:To evaluate the effect of orthokeratology on precision of measurements in children using a new swept-source optical coherence tomography(SS-OCT)optical biometer(OA-2000),and agreement between its measurements and those provided by the commonly used IOLMaster based on partial coherence interferometry(PCI).Methods:This study recruited fifty-one eyes of 51 normal children(8–16 years).An operator took measurements with the two ***,a second operator took measurements with the SS-OCT *** orthokeratology was performed for one month,the same operators repeated the same *** length(AL),mean keratometry(Km)at 2.5 mm and 3.0 mm diameters(Km2.5 and Km3.0),central corneal thickness(CCT),anterior chamber depth(ACD),lens thickness(LT)and corneal diameter(CD)were ***:With the SS-OCT optical biometer,the test-retest repeatability of AL measurements was*** 95%limits of agreement of difference between the two devices for CD parameter were up to 1.53 *** orthokeratology,the fluctuation ranges of difference for Km3.0 measurement was 1.11 times higher than before orthokeratology,while the absolute values of difference for AL,Km2.5,ACD and CD measurements were ***:Before and after orthokeratology,the SS-OCT biometer showed high repeatability and reproducibility for all *** orthokeratology contact lenses affected the agreement between SS-OCT and PCI biometers for Km3.0 *** CD measurement showed poor agreement between the two devices.

关键词： Swept source optical coherence tomography Orthokeratology Precision Agreement Children

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The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

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Eye and Vision 2020年第5期7卷 300-311页

作者： Yune Zhao Ding Chen giacomo savini Qing Wang Hongfang Zhang Yili Jin Benhao Song Rui Ning Jinhai Huang Chenyang Mei School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical UniversityWenzhouZhejiangChina Key Laboratory of Vision Science Ministry of Health P.R.ChinaWenzhouZhejiangChina G.B.Bietti Foundation IRCCS RomeItaly Eye Hospital of Wenzhou Medical University 270 West Xueyuan RoadWenzhou 325027ZhejiangChina

Purpose:To assess the repeatability and reproducibility of swept-source optical coherence tomography(SS-OCT)and Scheimpflug system and evaluate the agreement between the two systems in measuring multiple corneal regions in ***:Pachymetric and keratometric maps for both systems were ***,midperipheral and peripheral corneal thickness(CT),keratometry and astigmatism power vectors were *** three outcomes yielded by the same observer were used to assess intraobserver *** differences in the mean values provided by each observer were used to evaluate interobserver ***-subject standard deviation,test-retest repeatability(TRT)and coefficient of variation(CoV)were used to analyze the intraobserver repeatability and interobserver *** T-test and Bland-Altman were used to appraise interdevice ***:Seventy-eight eyes of 78 children were *** CoV was≤2.12 and 1.10%,respectively,for repeatability and *** and CoV were lower for central and paracentral CT measurements than for peripheral *** SS-OCT device generated higher precision when acquiring CT data,whereas Scheimpflug system showed higher reliability when measuring corneal *** the CT readings measured using SS-OCT were significantly thinner than Scheimpflug device(P<0.001),the central and thinnest CT values were still of high *** interdevice agreement of keratometry measurement was high for the central corneal region and moderate for the paracentral and peripheral ***:The precision of CT measurements by SS-OCT was higher,while the reliability of keratometry measurements by the Scheimpflug system was higher in *** from the measured values in the central corneal region,the thickness and keratometry readings should not be considered interchangeable between the two systems.

关键词： Central corneal thickness Children Precision Paracentral corneal thickness Peripheral corneal thickness Keratometry Swept-source optical coherence tomography Scheimpflug imaging

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