Correction factor in Orbscan II in the assessment of corneal pachymetry.


PURPOSE:Comparison of corneal pachymetry assessment with ultrasound and Orbscan II using acoustic factor and subtraction methods. METHODS:Ultrasound and Orbscan pachymetry for all patients with LASIK performed between July 2002 and May 2003 were retrospectively analyzed. Comparison between the 2 preoperative measurements was analyzed. RESULTS:Using a custom acoustic factor of 0.93, there was no significant difference between the overall ultrasound and Orbscan pachymetry (P = 0.696). However, there was underestimation in thick corneas and overestimation in thin corneas. Using the subtraction method as the correcting technique, the magnitude of over- and underestimation was reduced. CONCLUSION:The current correction method by means of acoustic factor may result in error in assessing extremes of corneal thickness. Alternative approaches such as the subtraction method can be considered to achieve more accurate results.






Cheng AC,Tang E,Mohamed S,Lam DS




Has Abstract


2006-12-01 00:00:00
















  • Posterior polymorphous dystrophy associated with nonkeratoconic steep corneal curvatures.

    abstract:PURPOSE:To report a case series of eyes with posterior polymorphous corneal dystrophy and steep nonkeratoconic corneas. METHODS:Retrospective, descriptive, nonrandomized case series. RESULTS:Thirty-five eyes of 18 patients (14 cases from 6 families and 4 isolated cases) with diffuse posterior polymorphous corneal dys...


    pub_type: 杂志文章


    authors: Raber IM,Fintelmann R,Chhabra S,Ribeiro MP,Eagle RC Jr,Orlin SE

    更新日期:2011-10-01 00:00:00

  • Efficacy of Corneal Collagen Cross-Linking for the Treatment of Keratoconus: A Systematic Review and Meta-Analysis.

    abstract:PURPOSE:To examine the efficacy of corneal collagen cross-linking (CXL) for the treatment of keratoconus (KCN). METHODS:A systemic literature review and meta-analysis of ocular functional and structural parameters of patients with KCN undergoing cross-linking procedures were performed using PubMed and the web of scien...


    pub_type: 杂志文章,meta分析,评审


    authors: Meiri Z,Keren S,Rosenblatt A,Sarig T,Shenhav L,Varssano D

    更新日期:2016-03-01 00:00:00

  • Rabbit Model of Corneal Endothelial Injury Established Using the Nd: YAG Laser.

    abstract:PURPOSE:To develop a new rabbit model of corneal endothelial injury using a neodymium-doped yttrium aluminum garnet (Nd:YAG) laser. METHODS:The corneal endothelia of 2 groups of New Zealand white rabbits were treated with an Nd:YAG laser in a uniformly scattered fashion. Rabbits in group A underwent laser burns on the...


    pub_type: 杂志文章


    authors: Zhang W,Hu Y,Lu L,Liu Y,Yang X,Sun H,Ruan J,Chen J,Yao Q,Yan C,Gu P,Fu Y,Shao C,Fan X

    更新日期:2017-10-01 00:00:00

  • Iris cavernous hemangioma associated with multiple cavernous hemangiomas in the kidney, brain, and skin.

    abstract:PURPOSE:To document the relationship of iris cavernous hemangiomas with multiorgan hemangiomas in a child. METHODS:A 7-year-old girl with kidney hemangiomas, brain hemangiomas, and skin hemangiomas developed blurred vision and darkening of the right iris. She had undergone 6 previous brain surgeries and multiple revis...


    pub_type: 杂志文章


    authors: Thangappan A,Shields CL,Dinowitz M,Shields JA

    更新日期:2007-05-01 00:00:00

  • Selective Endothelial Removal for Peters Anomaly.

    abstract:PURPOSE:Peters anomaly is the most common cause of congenital corneal opacities. Although conservative management is often ineffective except in mild cases, surgical intervention in the form of penetrating keratoplasty is fraught with unpredictability and often has unacceptable postoperative outcomes. As such, there is...


    pub_type: 杂志文章,评审


    authors: Soh YQ,Mehta JS

    更新日期:2018-03-01 00:00:00

  • Corneoscleral epithelial cysts: evidence of developmental etiology.

    abstract:PURPOSE:To describe the clinical features, histopathology, surgical management and possible etiopathogenesis of corneoscleral epithelial cysts. METHODS:Three patients with corneoscleral epithelial cysts underwent surgical ablation of the cysts. Material obtained during surgery was subjected to histopathologic analysis...


    pub_type: 杂志文章


    authors: Rao SK,Fogla R,Biswas J,Padmanabhan P

    更新日期:1998-07-01 00:00:00

  • Cell-based approach for treatment of corneal endothelial dysfunction.

    abstract::Decompensation of the corneal endothelium causes severe visual impairments that lead to blindness. Although corneal transplantation is a well-known effective therapy for corneal endothelial dysfunction, many patients are not afforded that therapeutic opportunity owing to the worldwide shortage of donor corneas. Thus, ...


    pub_type: 杂志文章,评审


    authors: Okumura N,Kinoshita S,Koizumi N

    更新日期:2014-11-01 00:00:00

  • Factors involved in the occurrence of bleeding complications after enucleation for cornea donation.

    abstract:PURPOSE:To identify risk factors for the occurrence of bleeding complications after enucleation for cornea donation, in order to develop preventive activities to reduce the occurrence of bleeding complications and especially the development of ocular hematomas. METHODS:From all Dutch cornea donors deceased in the year...


    pub_type: 杂志文章


    authors: van Wijk MJ,Nijenhuis MV,Dorrepaal CA,Bokhorst AG

    更新日期:2009-10-01 00:00:00

  • Adenovirus epithelial keratitis.

    abstract::The authors sought to determine whether adenovirus could infect human corneal epithelium in vivo. They reviewed the medical records of six patients with adenovirus-positive viral corneal cultures who were examined at the Bascom Palmer Eye Institute between March 21, 1986, and December 31, 1992. The six patients with a...


    pub_type: 杂志文章


    authors: Chodosh J,Miller D,Stroop WG,Pflugfelder SC

    更新日期:1995-03-01 00:00:00

  • Survival of rabbit limbal stem cell allografts after administration of cyclosporin A.

    abstract:OBJECTIVES:To evaluate the efficacy of systemic or topical administration of cyclosporin A (CsA) after limbal transplantation of stem cell allografts in rabbits. METHODS:Thirty-six rabbits underwent corneal epithelial debridement and limbal ablation to induce ocular surface disease and were then treated by limbal allo...


    pub_type: 杂志文章


    authors: Xu KP,Wu Y,Zhou J,Zhang X

    更新日期:1999-07-01 00:00:00

  • Effects of Repeated Intravitreal Aflibercept Injection on the Corneal Endothelium in Patients With Age-Related Macular Degeneration: Outcomes From the RE-VIEW Study.

    abstract:PURPOSE:The effects of repeated intravitreal aflibercept injection (IAI) on the corneal endothelium were studied in patients with unilateral neovascular age-related macular degeneration. METHODS:RE-VIEW was a phase 4, open-label, single-arm, multicenter study. Patients received IAI every 8 weeks after 3 monthly doses....


    pub_type: 杂志文章,多中心研究


    authors: Lass JH,Benetz BA,Menegay HJ,Tsipis CP,Cook JC,Boyer DS,Singer M,Erickson K,Saroj N,Vitti R,Chu KW,Moini H,Soo Y,Cheng Y

    更新日期:2018-05-01 00:00:00

  • Recovery time of an optimally secreting meibomian gland.

    abstract:PURPOSE:To investigate the times for an optimally secreting meibomian gland (OSMG) to be drained of available liquid secretion, to recover with expressible liquid secretion, and then to be redrained. METHODS:Twelve subjects with no dry eye symptoms and mean age 21.3 +/- 1.9 years were recruited. Lipid layer thickness ...


    pub_type: 杂志文章


    authors: Blackie CA,Korb DR

    更新日期:2009-04-01 00:00:00

  • In vitro comparison of Chen medium and Optisol-GS medium for human corneal storage.

    abstract:PURPOSE:To compare paired human corneas after storage at 4 degrees C in Chen medium (CM) and Optisol-GS medium (OM) for 7, 10, 14, and 21 days. METHODS:One cornea of each pair from nine human donors was randomly stored in either CM or OM, with its mate cornea stored in the other medium. Three pairs of corneas were sto...


    pub_type: 杂志文章


    authors: Nelson LR,Hodge DO,Bourne WM

    更新日期:2000-11-01 00:00:00

  • Prevalence of undiagnosed HIV infection in patients with ocular surface squamous neoplasia in a tertiary center in Karnataka, South India.

    abstract:PURPOSE:To evaluate the prevalence of undiagnosed and asymptomatic human immunodeficiency virus (HIV) infection in patients with ocular surface squamous neoplasia (OSSN) in a referral hospital in Karnataka, South India. METHODS:A consecutive series of patients presenting with OSSN were evaluated in an academic center ...


    pub_type: 杂志文章


    authors: Pradeep TG,Gangasagara SB,Subbaramaiah GB,Suresh MB,Gangashettappa N,Durgappa R

    更新日期:2012-11-01 00:00:00

  • Comparison of bifold forceps and cartridge injector suture pull-through insertion techniques for Descemet stripping automated endothelial keratoplasty.

    abstract:PURPOSE:To compare the outcome of bifold forceps and cartridge injector suture pull-through insertion techniques for Descemet stripping automated endothelial keratoplasty (DSAEK). METHODS:A retrospective review was conducted of the medical records of all patients treated with DSAEK at the University of Iowa Hospitals ...


    pub_type: 杂志文章


    authors: Wendel LJ,Goins KM,Sutphin JE,Wagoner MD

    更新日期:2011-03-01 00:00:00

  • Comparison of Topical Application of TSG-6, Cyclosporine, and Prednisolone for Treating Dry Eye.

    abstract:PURPOSE:To compare the therapeutic effects of topical tumor necrosis factor (TNF)-α-stimulated gene/protein-6 (TSG-6) with those of cyclosporine and prednisolone eye drops in NOD.B10.H2 mice, a model for inflammation-mediated dry eye. METHODS:The 12-week-old NOD.B10.H2 mice were topically administered recombinant TSG-...


    pub_type: 杂志文章


    authors: Kim YJ,Ryu JS,Park SY,Lee HJ,Ko JH,Kim MK,Wee WR,Oh JY

    更新日期:2016-04-01 00:00:00

  • Indications for penetrating keratoplasty and associated procedures, 1989-1995.

    abstract:PURPOSE:To identify changing trends in indications for penetrating keratoplasty and associated surgical procedures. METHODS:Review of charts from all patients who underwent penetrating keratoplasty at Wills Eye Hospital from January 1, 1989 through December 31, 1995. RESULTS:A total of 2,442 corneal transplants were ...


    pub_type: 杂志文章


    authors: Lois N,Kowal VO,Cohen EJ,Rapuano CJ,Gault JA,Raber IM,Laibson PR

    更新日期:1997-11-01 00:00:00

  • Sulfur Hexafluoride 20% Versus Air 100% for Anterior Chamber Tamponade in DMEK: A Meta-Analysis.

    abstract:PURPOSE:To compare intracameral 20% sulfur hexafluoride (SF6) versus 100% air as tamponade for graft attachment in Descemet membrane endothelial keratoplasty (DMEK). METHODS:Using an electronic database search on MEDLINE and CENTRAL from inception to December 2017, we performed a literature review and meta-analysis in...


    pub_type: 杂志文章,meta分析,评审


    authors: Marques RE,Guerra PS,Sousa DC,Ferreira NP,Gonçalves AI,Quintas AM,Rodrigues W

    更新日期:2018-06-01 00:00:00

  • Characterization of Corneal Donor Tissue Lesions by Anterior Segment Optical Coherence Tomography Compared With Eye Bank Technician Slit-Lamp Examination.

    abstract:PURPOSE:To compare anterior segment spectral-domain optical coherence tomography (OCT) with eye bank technician slit-lamp examination (SLE) in characterizing lesions in donor corneas. METHODS:Twenty-nine donor corneas identified by eye bank technicians to have opacities or lesions potentially representing pathologic f...


    pub_type: 杂志文章


    authors: Hsu ST,Perry I,Botsay S,Ko N,Stinnett SS,Kuo AN,Shieh C

    更新日期:2018-10-01 00:00:00

  • Multimodal Assessment of Corneal Thinning Using Optical Coherence Tomography, Scheimpflug Imaging, Pachymetry, and Slit-Lamp Examination.

    abstract:PURPOSE:To assess the relationship between corneal thinning measured by clinician-graded slit-lamp examination compared with ultrasound pachymetry (USP), anterior segment optical coherence tomography (AS-OCT), and the Pentacam. METHODS:Patients with corneal thinning underwent USP, AS-OCT, Pentacam measurements and sta...


    pub_type: 杂志文章


    authors: Oatts JT,Keenan JD,Mannis T,Lietman TM,Rose-Nussbaumer J

    更新日期:2017-04-01 00:00:00

  • Recurrence of keratoconic pathology in penetrating keratoplasty buttons originally transplanted for keratoconus.

    abstract:PURPOSE:Study aimed to examine buttons removed from patients originally grafted for KC (group 1) for signs of recurrence at a cellular level and compare them with buttons removed from patients originally grafted for other conditions (group 2). The study further aimed to compare buttons from group 1 exhibiting high asti...


    pub_type: 杂志文章


    authors: Brookes NH,Niederer RL,Hickey D,McGhee CN,Sherwin T

    更新日期:2009-07-01 00:00:00

  • Clostridium sordellii endophthalmitis after suture removal from a corneal transplant.

    abstract:PURPOSE:To report a case of endophthalmitis caused by Clostridium sordellii. METHODS:A 33-year-old man sustained a penetrating injury of the right eye that resulted in several ocular surgical procedures including pars plana vitrectomy, scleral buckling, scleral-sutured posterior chamber intraocular lens, and penetrati...


    pub_type: 杂志文章


    authors: Zink JM,Singh-Parikshak R,Sugar A,Johnson MW

    更新日期:2004-07-01 00:00:00

  • Topical bevacizumab and ocular surface neovascularization in patients with stevens-johnson syndrome.

    abstract:PURPOSE:To evaluate the efficacy and safety of topical bevacizumab on ocular surface neovascularization among patients with Stevens-Johnson syndrome. METHODS:This was a retrospective, interventional case report. Three eyes of 2 patients were examined. Bevacizumab (25 mg/mL) eyedrops were applied 4 times daily for a pe...


    pub_type: 杂志文章


    authors: Uy HS,Chan PS,Ang RE

    更新日期:2008-01-01 00:00:00

  • Effects of corneal cross-linking on contrast sensitivity, visual acuity, and corneal topography in patients with keratoconus.

    abstract:PURPOSE:To assess the effects of corneal collagen cross-linking (CXL) on contrast sensitivity (CS), visual acuity, and corneal topography investigating possible predictors of efficacy. METHODS:Sixty-eight eyes of 34 patients with progressive keratoconus were enrolled in this prospective study. CXL was performed in one...


    pub_type: 杂志文章


    authors: Lamy R,Netto CF,Reis RG,Procopio B,Porco TC,Stewart JM,Dantas AM,Moraes HV Jr

    更新日期:2013-05-01 00:00:00

  • Histologic evaluation of human posterior lamellar discs for femtosecond laser Descemet's stripping endothelial keratoplasty.

    abstract:PURPOSE:To evaluate the histologic changes in corneal structure after femtosecond laser preparation of posterior lamellar discs, more specifically, the smoothness of the stromal bed and the accuracy of the predicted depth of the horizontal lamellar cut. MATERIALS AND METHODS:Nineteen human donor eyes unsuitable for tr...


    pub_type: 杂志文章


    authors: Cheng YY,Kang SJ,Grossniklaus HE,Pels E,Duimel HJ,Frederik PM,Hendrikse F,Nuijts RM

    更新日期:2009-01-01 00:00:00

  • Conjunctival proliferation after a mild pepper spray injury in a young child.

    abstract:PURPOSE:To report a case of conjunctival proliferation in a 2.5-year-old boy after initial evidence of a mild chemical injury after ocular exposure to pepper spray (oleoresin capsicum). METHODS:Case report with ophthalmologic and histologic findings. RESULTS:A child presented with mild conjunctival injection and chem...


    pub_type: 杂志文章


    authors: Gerber S,Frueh BE,Tappeiner C

    更新日期:2011-09-01 00:00:00

  • The Effect of Intraoperative Angle Kappa Adjustment on Higher-Order Aberrations Before and After Small Incision Lenticule Extraction.

    abstract:PURPOSE:To compare higher-order aberrations (HOAs) after small incision lenticule extraction (SMILE) in patients with and without intraoperative angle kappa adjustments. METHODS:This is a retrospective case series. One hundred six eyes of 106 patients who underwent SMILE at Tianjin Eye Hospital (Tianjin Medical Univer...


    pub_type: 杂志文章


    authors: Shao T,Wang Y,Ng ALK,Chan TCY,Hao W,Zhang J,Cheng GPM,Jhanji V

    更新日期:2020-05-01 00:00:00

  • Treatment of aniridia with Boston type I keratoprosthesis.

    abstract:PURPOSE:To report the outcomes of Boston keratoprosthesis (K-pro) type I implantation for congenital aniridia. METHODS:A retrospective review of the medical records of every patient with congenital aniridia who underwent Boston K-pro type I implantation at the University of Iowa Hospitals and Clinics from January 1, 2...


    pub_type: 杂志文章


    authors: Rixen JJ,Cohen AW,Kitzmann AS,Wagoner MD,Goins KM

    更新日期:2013-07-01 00:00:00

  • Progressive replacement of oral mucosa by conjunctiva in osteo-odonto-keratoprosthesis: preliminary observations.

    abstract:PURPOSE:In a Strampelli osteo-odonto-keratoprosthesis, a patch of oral mucosa is frequently used to cover the ocular surface after implantation of an osteodental lamina into the eye. In many cases, gross modifications in the eye covering become apparent a few years later. The aim of this study was to investigate the hi...


    pub_type: 杂志文章


    authors: Pecorella I,Maurizio T,Antonio C,Giancarlo F

    更新日期:2006-02-01 00:00:00

  • Development and characterization of acellular porcine corneal matrix using sodium dodecylsulfate.

    abstract:PURPOSE:The objective of this study was to produce a porcine corneal acellular matrix (ACM) and assess its possibility for biomedical applications. METHODS:Porcine corneas were treated with various concentrations of sodium dodecylsulfate for different lengths of time. Optimal conditions for processing the ACM were not...


    pub_type: 杂志文章


    authors: Zhou Y,Wu Z,Ge J,Wan P,Li N,Xiang P,Gao Q,Wang Z

    更新日期:2011-01-01 00:00:00