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IOL power calculation cataract keratoconus

Kazutaka Kamiya, Kei Iijima, Shoji Nobuyuki, Yosai Mori, Kazunori Miyata, Takefumi Yamaguchi, Jun Shimazaki, Shinya Watanabe, Naoyuki Maeda
This study was aimed to assess the predictability of intraocular lens (IOL) power calculation after cataract surgery for keratoconus. We retrospectively reviewed the clinical charts of 102 eyes of 71 consecutive keratoconic patients who developed cataract. We determined manifest spherical equivalent, prediction errors, and absolute errors, 1 month postoperatively. The achieved refraction was significantly more hyperopic than the targeted refraction, when keratometric readings were used (p = 0.001). At 1 month, 36% and 63% of the eyes were within ±0...
January 22, 2018: Scientific Reports
Pankaj C Gupta, Jane T Caty
PURPOSE OF REVIEW: To evaluate and summarize literature from the past 18 months reporting advancements and issues in astigmatism assessment prior to cataract surgery. RECENT FINDINGS: New and updated toric calculators and regression formulas offer the opportunity for more accurate lens selection for our patients. Concurrently, improvements in topographic evaluation of corneal keratometry have allowed for a decrease in unplanned residual corneal astigmatism. Measuring posterior corneal astigmatism is especially valuable in eyes with keratoconus when planning to implant toric intraocular lens (IOL) and now allows access to this patient population...
January 2018: Current Opinion in Ophthalmology
Reena Gupta, Ruta Kinderyte, Deborah S Jacobs, Ula V Jurkunas
PURPOSE: To report a case of coexistent Fuchs endothelial corneal dystrophy (FECD) and keratoconus (KCN) in which there was normalization of corneal topography after Descemet membrane endothelial keratoplasty (DMEK). METHODS: Retrospective medical record review. RESULTS: Preoperative findings revealed a best-corrected visual acuity of 20/40 with -1.00 - 2.50 × 147, topographic maximum keratometry of 50.8 D with inferior steeping, and confluent guttae in the left eye...
October 2017: Cornea
Sara Bozorg, Roberto Pineda
Patients with both cataract and keratoconus present unique challenges for the surgeon. Accurate keratometry (K) and axial length (AL) readings may be impossible, and uncertainty is introduced when estimating the corneal power for intraocular lens (IOL) selection. Different options on how to choose an IOL and how to manage irregular astigmatism of a keratoconic patient with cataract have been proposed and are reviewed. The stage of keratoconus and the history of the patient are both critical in determining the strategy used in treatment of cataracts...
September 2014: Seminars in Ophthalmology
Jorge L Alió, Pablo Peña-García, Fidan Abdulla Guliyeva, Felipe A Soria, Ghassam Zein, Sabat K Abu-Mustafa
AIMS: To investigate the visual and refractive outcomes, safety, efficacy and stability of cataract surgery in eyes with stable keratoconus. METHODS: 17 eyes (10 patients) diagnosed as stable keratoconus, aged from 34 to 73 years (56.63 ± 12.47), underwent micro-incision cataract surgery (MICS) followed by implantation of toric intraocular lens (IOL). Seven of them were operated bilaterally and three unilaterally. A complete ophthalmological examination was performed preoperatively and postoperatively...
March 2014: British Journal of Ophthalmology
Do Young Park, Dong Hui Lim, Tae-Young Chung, Eui-Sang Chung
PURPOSE: We describe a patient with posterior keratoconus accompanied by hyperopia and a cataract, which were successfully treated by cataract surgery and secondary piggyback intraocular lens (IOL) implantation. METHODS: Case report. RESULTS: A 47-year-old woman presented to our clinic with low vision in her right eye. Uncorrected distant visual acuity was 20/400 in the right eye with a manifest refraction of +11.5 diopters. On the slit-lamp examination, localized posterior keratoconus and lens opacity were noted in the right eye...
May 2013: Cornea
Sepehr Feizi, Mohammad A Javadi
PURPOSE: To evaluate change in graft steepness after graft refractive surgery (GRS) consisting of relaxing incisions with or without counterquadrant compression sutures and discover the existing influential factors. METHODS: In this retrospective study, 78 eyes of 76 patients who had received penetrating keratoplasty for keratoconus underwent GRS because of high post-penetrating keratoplasty astigmatism. Any shift in graft curvature was calculated using the keratometric coupling ratio (CR; the ratio of flattening of the incised meridian to steepening of the opposite meridian)...
September 2012: Cornea
Nuthida Thebpatiphat, Kristin M Hammersmith, Christopher J Rapuano, Brandon D Ayres, Elisabeth J Cohen
PURPOSE: To evaluate the visual and topographic outcomes in patients with keratoconus who have undergone cataract surgery and to analyze different methods of keratometry and formulas for intraocular lens (IOL) calculation in patients with keratoconus. METHODS: In a retrospective case series, 12 eyes (nine patients) with keratoconus underwent phacoemulsification with IOL implantation. The IOL power was determined by using standard and corneal topography-derived keratometry in three formulas: SRK, SRKII, and SRKT...
September 2007: Eye & Contact Lens
Tetsuro Oshika
The importance of quality of vision (QOV) along with quality of life (QOL) in medicine has been recently widely recognized. We have conducted studies to quantitatively analyze factors related to QOV. Irregular astigmatism can be a significant obstacle for achieving satisfactory QOV. Videokeratography data were broken down using Fourier harmonic series analysis into spherical power, regular astigmatism (second harmonic component, n = 2), asymmetry (n = 1), and higher order irregularity (n > or = 3). The irregular astigmatism component calculated by the Fourier analysis significantly correlated with best spectacle-corrected visual acuity...
December 2004: Nippon Ganka Gakkai Zasshi
B Seitz, A Langenbucher, A Beyer, M M Kus, A Behrens
PURPOSE: After penetrating keratoplasty (PK), peripheral swelling effects, malapposition of the graft in the recipient bed and suture tension may result in a changed ratio of curvature between anterior and posterior corneal surface. The purpose of this pilot study was to assess the posterior corneal curvature after PK with and without sutures and to compare this data to the posterior curvature of normal individuals. PATIENTS AND METHODS: In this cross-sectional study, 44 eyes after PK with a double running 16-bite diagonal antitorque suture in place (mean age 37 +/- 14 years, spherical equivalent (SEQ) -0...
September 2000: Klinische Monatsblätter Für Augenheilkunde
C P Noonan, J Mackenzie, A Chandna
Measurement of the anterior corneal radius of curvature is important in the pediatric population for proper fitting of contact lenses, calculation of intraocular lens power in patients undergoing cataract surgery, and monitoring changes in shape of the cornea in keratoconus. Because astigmatism in preschool children is mainly the result of corneal asphericity, measurement of the anterior corneal radius of curvature may also be used in screening in children at risk for amblyopia. The aim of this study was to determine the repeatability of the hand-held automated Nidek keratometer (Nidek Co...
June 1998: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
B Seitz, A Behrens, A Langenbucher
In the review period, limitations of individual Placido disk-based topography systems have been studied and new principles, such as raster photogrammetry, pancorneal slit topography, laser holographic interferometry, and confocal laser scanning topography, have been introduced for laboratory or clinical work. Both Fourier analysis and Zernike decomposition of topographic height data seem to be powerful new tools for cross-sectional analysis of complex topographic corneal images, such as after cataract surgery, penetrating keratoplasty, and refractive surgery, as well as for longitudinal studies of corneal changes, such as in schoolchildren...
August 1997: Current Opinion in Ophthalmology
L Celikkol, D Ahn, G Celikkol, S T Feldman
A patient with keratoconus had cataract extraction and intraocular lens (IOL) implantation in both eyes. The IOL power was determined using keratometric values (K-values) measured by standard keratometry in the right eye and videokeratography in the left eye. The ideal IOL power and the K-value that would have led to the ideal IOL power were determined from the postoperative refraction at 6 weeks. The ideal K-value was compared with the K-values derived from videokeratography and standard keratometry. Refraction at 6 weeks postoperatively was 5...
May 1996: Journal of Cataract and Refractive Surgery
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