Abstract：
PURPOSE:To evaluate the accuracy of the C constant for ray tracing-assisted intraocular lens (IOL) power calculation. DESIGN:Case series. SETTING:Public university hospital and private clinic. METHODS:Preoperatively, all intraocular distances were measured using laser biometry. Various IOL designs were studied; powers ranged from -5.0 diopters (D) to +38.0 D. The IOL power calculation was performed with the Olsen formula using the C constant and compared with the Haigis, Hoffer Q, Holladay 1, and the SRK/T formulas on optimized datasets. Outcome measures were the error of the prediction, expressed as the arithmetic error, and the absolute error between the observed refraction and the predicted refraction. RESULTS:Two thousand forty-three cases from the 2 centers were studied. No significant differences were found between the Haigis, Hoffer Q, Holladay 1, and SRK/T formulas with the exception of the SRK/T formula, which performed better than the other thin-lens formulas in eyes with an axial length (AL) greater than 27.0 mm (P<.01). Compared with the SRK/T formula, the Olsen formula showed an improvement of 15% and 14% in the mean absolute error and a 39% and 85% reduction in the number of large errors (>1.0 D) for the 2 series, respectively (P<.0001). Contrary to the Olsen formula, all thin-lens formulas showed a significant bias in terms of the AL, keratometry reading, and anterior segment length (P<.0001). CONCLUSION:The C constant is a promising concept for ray tracing-assisted IOL power calculation.
journal_name
J Cataract Refract Surgjournal_title
Journal of cataract and refractive surgeryauthors
Olsen T,Hoffmann Pdoi
10.1016/j.jcrs.2013.10.037subject
Has Abstractpub_date
2014-05-01 00:00:00pages
764-73issue
5eissn
0886-3350issn
1873-4502pii
S0886-3350(14)00249-1journal_volume
40pub_type
临床试验,杂志文章,多中心研究abstract：:A 39-year-old man was referred with complaints of pain, redness, and reduced vision in the left eye after projectile trauma during hammering. Two years previously, anterior chamber phakic intraocular lenses (pIOLs) had been implanted to correct the patient's high myopia. On presentation, the best corrected visual acui...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2007.07.022
更新日期：2007-12-01 00:00:00
abstract：PURPOSE:To compare the incidence of posterior capsule rupture and vitreous loss during phacoemulsification with and without the use of an anterior chamber maintainer (ACM) SETTING: Aristotle University Eye Clinic, Thessaloniki, Greece. METHODS:The surgical records of patients who had phacoemulsification by experienced...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/S0886-3350(03)00584-4
更新日期：2004-02-01 00:00:00
abstract：:In 8 cases that presented with symptomatic posterior chamber IOL subluxation, a McCannel polypropylene (Prolene) suture was used with the Siepser slipknot technique to successfully refixate the IOLs to the iris. There were no intraoperative complications, and a round pupil was preserved in all cases. ...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2003.10.025
更新日期：2004-06-01 00:00:00
abstract：:One hundred and thirty-three eyes of 103 patients had photorefractive keratectomy with a slit scan mode excimer laser for myopia ranging from -6.00 to -22.00 diopters (D). The epithelium was removed with 20% ethanol, and the ablation was done with a tapered profile surrounding the optical zone. Patients were divided i...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/s0886-3350(13)80526-3
更新日期：1995-07-01 00:00:00
abstract：:Surgery is a major source of errors in patient care. Preventing complications from surgical errors in the operating room is estimated to lead to reduction of up to 41,846 readmissions and save $620.3 million per year. It is now established that poor technical skill is associated with an increased risk of severe advers...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1097/j.jcrs.0000000000000322
更新日期：2020-07-13 00:00:00
abstract：PURPOSE:To compare the accuracy of intraocular lens power prediction for eyes with average keratometry (K) readings greater than 46.00 diopters (D) and lower than 42.00 D. SETTING:Ein-Tal Eye Center, Tel-Aviv, Israel. DESIGN:Retrospective case series. METHODS:Eyes having cataract extraction surgery with steep and fl...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2017.06.036
更新日期：2017-09-01 00:00:00
abstract：PURPOSE:To investigate the association between intraocular pressure (IOP), central corneal thickness (CCT), or both and wavefront aberrations in the anterior cornea and the whole eye in myopia. SETTING:Wenzhou Medical College, Wenzhou, Zhejiang, China. METHODS:Seventy myopic subjects were tested with a Humphrey corne...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2007.04.012
更新日期：2007-08-01 00:00:00
abstract：:In 1984, our ophthalmology department switched from intracapsular cataract extraction (ICCE) to extracapsular cataract extraction (ECCE). We reviewed the postoperative incidence of retinal detachment (RD) in two consecutive series: (1) 604 eyes operated on by ICCE from 1982 to 1983 and (2) 1726 eyes operated on by ECC...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/s0886-3350(13)80498-1
更新日期：1995-03-01 00:00:00
abstract：PURPOSE:To compare the early postoperative visual rehabilitation after laser-assisted subepithelial keratectomy (LASEK) and photorefractive keratectomy (PRK) for the correction of myopia. SETTING:CODET Aris Vision Institute, Tijuana, Mexico. METHODS:This prospective study included 50 eyes of 25 patients with myopia w...
journal_title：Journal of cataract and refractive surgery
pub_type： 临床试验,杂志文章
doi：10.1016/s0886-3350(02)01376-7
更新日期：2002-08-01 00:00:00
abstract：PURPOSE:To investigate the magnitude of postoperative astigmatism in children having cataract extraction with intraocular lens (IOL) implantation through a 3.0 mm superior clear corneal incision. SETTING:Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, USA. METHODS:This retro...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2004.01.019
更新日期：2004-09-01 00:00:00
abstract：:We present a case of endocapsular hematoma, a rare form of intraocular hemorrhage that developed in a patient with pseudophakia receiving oral anticoagulants for previous mitral valve replacement and cerebrovascular disease. ...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2005.07.011
更新日期：2006-01-01 00:00:00
abstract：PURPOSE:To evaluate the safety and efficacy of hyperopic laser in situ keratomileusis (LASIK) in treating hyperopia caused by overcorrected myopic LASIK and to evaluate a new technique to place the hyperopic treatment after lifting the initial myopic flap. SETTING:Open-access outpatient excimer laser surgical facility...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/s0886-3350(00)00784-7
更新日期：2001-03-01 00:00:00
abstract：PURPOSE:To assess the clinical results of transepithelial collagen crosslinking (CXL) in patients 26 years and younger with progressive keratoconus suitable for epithelium-off (epi-off) CXL. SETTING:Department of Ophthalmology, Siena University Hospital, Siena, Italy. DESIGN:Prospective case series. METHODS:The stud...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2013.03.026
更新日期：2013-08-01 00:00:00
abstract：PURPOSE:To determine the effect of a liquid dissection technique on clinical outcomes with ultrastructural analysis of the lenticule surface in small-incision lenticule extraction (SMILE). SETTING:Zhongshan Ophthalmic Center, Guangzhou, China. DESIGN:Prospective case series. METHODS:Consecutive patients with myopia ...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章,随机对照试验
doi：10.1016/j.jcrs.2018.06.023
更新日期：2018-09-01 00:00:00
abstract：PURPOSE:To evaluate the efficacy, safety, predictability, and surgically induced astigmatism (SIA) of laser in situ keratomileusis (LASIK) for the correction of myopia and myopic astigmatism. SETTING:Department of Ophthalmology, National Taiwan University Hospital, Taipei, Taiwan. METHODS:This retrospective study com...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/s0886-3350(01)01071-9
更新日期：2001-12-01 00:00:00
abstract：:We introduce a technique for iris fixation of a posterior chamber intraocular lens (IOL) in which most of the procedure is done outside the eye. This minimizes intraocular manipulation, maximizes corneal endothelial preservation, and avoids the risk for IOL drop into the vitreous cavity intraoperatively. The IOL is fi...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2016.10.008
更新日期：2016-12-01 00:00:00
abstract：PURPOSE:To compare posterior capsule opacification (PCO) after phacoemulsification and implantation of heparin-surface-modified (HSM) poly(methyl methacrylate) (PMMA) intraocular lenses (IOLs) in the capsular bag in patients with diabetes mellitus with that in a control group. SETTING:St. Erik's Eye Hospital, Stockhol...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/s0886-3350(99)80132-1
更新日期：1999-02-01 00:00:00
abstract：PURPOSE:To determine whether laser in situ keratomileusis (LASIK) produces significant changes in optic nerve head (ONH) topography and retinal nerve fiber layer (RNFL) thickness as measured by the Heidelberg Retina Tomograph (HRT) and to evaluate the potential neuroprotective effect of topical betaxolol on these chang...
journal_title：Journal of cataract and refractive surgery
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1016/s0886-3350(03)00466-8
更新日期：2003-12-01 00:00:00
abstract：PURPOSE:To report the prevalence of ocular surface dysfunction in patients presenting for cataract surgery evaluation. SETTING:Duke University Eye Center and Weill Cornell Ophthalmology, single-physician practices. DESIGN:Prospective case series. METHODS:Consecutive patients presenting for cataract surgery evaluatio...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2018.06.026
更新日期：2018-09-01 00:00:00
abstract：:We present 2 cases of toric intraocular lens implantation for keratoconus: A 55-year-old man with forme fruste keratoconus with a preoperative uncorrected distance visual acuity (UDVA) of 20/800 and a refraction of -6.50-3.00x135 and a 46-year-old man with a claw-shaped topographic pattern, a family history of keratoc...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2009.05.043
更新日期：2009-11-01 00:00:00
abstract：:This case outlines the phacoemulsification technique used to overcome the challenge of the hyperdeep anterior chamber, weak zonules, abnormal anterior capsule, and large capsular bag. Key steps included trypan blue staining of the anterior capsule, a large capsulorhexis, prolapse of the nucleus into the anterior chamb...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2005.12.143
更新日期：2006-07-01 00:00:00
abstract：UNLABELLED:Left ventricular assist devices (LVADs) have been increasingly used for 20 years in terminally ill patients with advanced heart failure or awaiting cardiac transplantation. Despite improvement in morbidity and mortality from use of these devices, quality of life may be limited by cataract. Access to cataract...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2014.01.024
更新日期：2014-04-01 00:00:00
abstract：:We describe a technique for cataract extraction in vitrectomized eyes that uses secured removal of the nucleus with no manipulation of the capsular bag. After a large scleral tunnel is prepared and a capsulorhexis created, a 20-gauge retinal cryoprobe enveloped in a plastic or a silicone sleeve is introduced into the ...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/s0886-3350(02)01272-5
更新日期：2002-10-01 00:00:00
abstract：PURPOSE:To evaluate negative dysphotopsia in the far periphery of the pseudophakic eye by generating simulated images of text charts. SETTING:Consultancy. DESIGN:Laboratory study. METHODS:Simulated images of a peripheral text chart were created using a ray-trace model of a pseudophakic eye. The point spread function...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1097/j.jcrs.0000000000000103
更新日期：2020-03-01 00:00:00
abstract：PURPOSE:To determine the level of residual spherical aberration that gives the best objective and subjective quality of image after cataract surgery with intraocular lens (IOL) implantation. SETTING:Department of Ophthalmology, CHU Bretonneau, Tours, France. DESIGN:Cohort study. METHODS:Six months after microincisio...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2010.12.056
更新日期：2011-06-01 00:00:00
abstract：PURPOSE:To determine the effect of ophthalmic viscosurgical devices (OVDs) and irrigation/aspiration (I/A) settings on free radical development during phacoemulsification. SETTING:Department of Ophthalmology, Nippon Medical School, Tokyo, Japan. METHODS:Free radicals were detected by the electron spin resonance (ESR)...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2006.04.026
更新日期：2006-09-01 00:00:00
abstract：PURPOSE:To determine the clinical outcomes of isolated Descemet membrane transplantation (ie, Descemet membrane endothelial keratoplasty [DMEK]) in phakic eyes. SETTING:Tertiary referral center. DESIGN:Cohort study. METHODS:Phakic eyes from a larger group of consecutive eyes that had DMEK for Fuchs endothelial dystr...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2011.11.038
更新日期：2012-05-01 00:00:00
abstract：PURPOSE:To compare the safety and efficacy of the new sodium hyaluronate viscoelastic, Microvisc, with those of Healon in routine phacoemulsification. SETTING:York Finch Eye Associates and York Finch General Hospital, Toronto, Ontario, Canada. METHODS:An unmasked, prospective, randomized clinical trial of 100 eyes in...
journal_title：Journal of cataract and refractive surgery
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1016/s0886-3350(97)80288-x
更新日期：1997-06-01 00:00:00
abstract：:Interlenticular opacification (ILO) developed 7 months after secondary acrylic piggyback lens implantation in which the anterior lens was placed in the bag. This resulted in glare and a hyperopic shift. Treating the ILO with the neodymium:YAG laser successfully reduced the glare and corrected the hyperopic shift. ...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/s0886-3350(01)00865-3
更新日期：2001-09-01 00:00:00
abstract：PURPOSE:To evaluate the effect of implanting 1 or 2 intracorneal rings (Intacs, KeraVision) as a device to correct, stabilize, and/or improve the best corrected visual acuity in patients with clear cornea keratoconus oriented by the preoperative corneal topography pattern. SETTING:Vissum/Instituto Oftalmológico de Ali...
journal_title：Journal of cataract and refractive surgery
pub_type： 杂志文章
doi：10.1016/j.jcrs.2004.09.050
更新日期：2005-05-01 00:00:00
