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IOL power calculation

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https://www.readbyqxmd.com/read/29770644/comparative-efficacy-of-the-new-optical-biometer-on-intraocular-lens-power-calculation-al-scan-versus-iolmaster
#1
Ahnul Ha, Won Ryang Wee, Mee Kum Kim
PURPOSE: To evaluate the agreement in axial length (AL), keratometry, and anterior chamber depth measurements between AL-Scan and IOLMaster biometers and to compare the efficacy of the AL-Scan on intraocular lens (IOL) power calculations and refractive outcomes with those obtained by the IOLMaster. METHODS: Medical records of 48 eyes from 48 patients who underwent uneventful phacoemulsification and IOL insertion were retrospectively reviewed. One of the two types of monofocal aspheric IOLs were implanted (Tecnis ZCB00 [Tecnis, n = 34] or CT Asphina 509M [Asphina, n = 14])...
May 15, 2018: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/29721927/estimations-of-retinal-blue-light-irradiance-values-and-melatonin-suppression-indices-through-clear-and-yellow-tinted-intraocular-lenses
#2
Masaki Tanito, Ichiya Sano, Tsutomu Okuno, Yoshihisa Ishiba, Akihiro Ohira
Spectral transmittance values in the wavelength range of 300 to 800 nanometers were measured using a spectrophotometer for 18 intraocular lenses (IOLs) including clear (ZCB00) and yellow-tinted (ZCB00V, both from AMO Japan) IOLs with three different lens powers. Also measured were the blue-light irradiance (BLI) values, which might reflect retinal damage caused by sunlight, and the melatonin suppression indices (MSIs), which might reflect the nonvisual photoreception function, through these IOLs. The BLIs (in mWcm-2 ) calculated were 7...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29700651/comparison-of-anterior-segment-parameters-and-axial-length-measurements-performed-on-a-scheimpflug-device-with-biometry-function-and-a-reference-optical-biometer
#3
Maria Muzyka-Woźniak, Adam Oleszko
PURPOSE: To compare measurements of axial length (AL), corneal curvature (K), anterior chamber depth (ACD) and white-to-white (WTW) distance on a new device combining Scheimpflug camera and partial coherence interferometry (Pentacam AXL) with a reference optical biometer (IOL Master 500). To evaluate differences between IOL power calculations based on the two biometers. METHODS: Ninety-seven eyes of 97 consecutive cataract or refractive lens exchange patients were examined preoperatively on IOL Master 500 and Pentacam AXL units...
April 26, 2018: International Ophthalmology
https://www.readbyqxmd.com/read/29685742/-is-holladay-2-formula-acurate-enough-for-calculating-intraocular-lens-power-in-non-standard-eyes
#4
C Cordelette, C Arndt, J Vidal, M Afriat, E Durbant, C Brugniart, A Ducasse, F Favre, A Denoyer
PURPOSE: To evaluate the benefit of the Holladay 2 formula versus the 3rd generation formulae in calculating the IOL power in eyes with non-standard axial length or keratometry before cataract surgery. PATIENTS: Retrospectiv study from January to December 2015. The inclusion critaeria were axial length (AL) <22mm or >26mm, or average keratometry <42 D or >46 D, dividing the patients in 4 groups respectively. The 7 parameters required to calculate the Holladay 2 formula were collected...
April 20, 2018: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29615113/intraocular-lens-power-calculation-for-the-equine-eye
#5
Ulrike Meister, Christiane Görig, Christopher J Murphy, Hubertus Haan, Bernhard Ohnesorge, Michael H Boevé
BACKGROUND: Phacoemulsification and intraocular lens (IOL) implantation during cataract surgery in horses occur with increasing frequency. To reduce the postoperative refractive error it is necessary to determine the proper IOL power. In the present study retinoscopy, keratometry and ultrasonographic biometry were performed on 98 healthy equine eyes from 49 horses. The refractive state, corneal curvature (keratometry) and the axial location of all optical interfaces (biometry) were measured...
April 3, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29607215/calculation-of-unknown-preoperative-k-readings-in-postrefractive-surgery-patients
#6
Nicola Rosa, Maddalena De Bernardo, Maria Borrelli
Purpose: To determine the unknown preoperative K readings (Kpre) to be used in history-based methods, for intraocular lens (IOL) power calculation in patients who have undergone myopic photorefractive keratectomy (PRK). Methods: A regression formula generated from the left eyes of 174 patients who had undergone PRK for myopia or for myopic astigmatism was compared with other methods in 168 right eyes. The Pearson index and paired t -test were utilized for statistical analysis...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29605815/predictability-of-formulae-for-intraocular-lens-power-calculation-according-to-the-age-of-implantation-in-paediatric-cataract
#7
Byung Joo Lee, Sang-Mok Lee, Jeong Hun Kim, Young Suk Yu
AIMS: To analyse the predictability of diverse intraocular lens (IOL) power calculation formulae in paediatric patients with congenital cataract. METHODS: The medical records of patients who underwent cataract surgery and posterior chamber IOL implantation (in-the-bag) for congenital cataract before 17 years of age were reviewed retrospectively. Target refractions calculated by Sanders-Retzlaff-Kraff (SRK)/II, SRK/T and Hoffer-Q formulae were compared with the actual refraction...
March 31, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29564411/comparison-of-okulix-ray-tracing-software-with-srk-t-and-hoffer-q-formula-in-intraocular-lens-power-calculation
#8
Mohammad Ghoreyshi, Ahmadreza Khalilian, Mohammadreza Peyman, Mohaddeseh Mohammadinia, Alireza Peyman
Purpose: To compare the performance of OKULIX ray-tracing software with SRK-T and Hoffer Q formula in intraocular lens (IOL) power calculation in patients presenting with cataract. Methods: In this prospective study, 104 eyes of 104 patients with cataract who underwent phacoemulsification and IOL implantation were recruited. Three IOL brands were used and for all eyes, IOL power calculation was performed using SRK-T, Hoffer Q formula and also OKULIX ray-tracing software...
March 2018: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/29545950/comparison-of-two-toric-iol-calculation-methods
#9
C Kern, K Kortüm, M Müller, A Kampik, S Priglinger, W J Mayer
Purpose: To compare two calculators for toric intraocular lens (IOL) calculation and to evaluate the prediction of refractive outcome. Methods: Sixty-four eyes of forty-five patients underwent cataract surgery followed by implantation of a toric intraocular lens (Zeiss Torbi 709 M) calculated by a standard industry calculator using front keratometry values. Prediction error, median absolute error, and refractive astigmatism error were evaluated for the standard calculator...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29543854/comparison-of-axial-length-anterior-chamber-depth-and-intraocular-lens-power-between-iolmaster-and-ultrasound-in-normal-long-and-short-eyes
#10
Jing Dong, Yaqin Zhang, Haining Zhang, Zhijie Jia, Suhua Zhang, Xiaogang Wang
PURPOSE: To compare the axial length (AL), anterior chamber depth (ACD) and intraocular lens power (IOLP) of IOLMaster and Ultrasound in normal, long and short eyes. METHODS: Seventy-four normal eyes (≥ 22 mm and ≤ 25 mm), 74 long eyes (> 25 mm) and 78 short eyes (< 22 mm) underwent AL and ACD measurements with both devices in the order of IOLMaster followed by Ultrasound. The IOLP were calculated using a free online LADAS IOL formula calculator. RESULTS: The difference in AL and IOLP between IOLMaster and Ultrasound was statistically significant when all three groups were combined...
2018: PloS One
https://www.readbyqxmd.com/read/29527012/accuracy-of-intraocular-lens-power-calculation-using-three-optical-biometry-measurement-devices-the-oa-2000-lenstar-ls900-and-iolmaster-500
#11
Olga Reitblat, Adi Levy, Guy Kleinmann, Ehud I Assia
PURPOSE: To compare ocular measurements of three optical biometry devices and their application in intraocular lens (IOL) power calculations. METHODS: One hundred and forty eyes which had undergone cataract extraction surgery with preoperative biometry with OA--2000, IOLMaster-500, and Lenstar-LS900 were enrolled. Biometry measurements of the three devices were compared. The deviation of the postoperative refraction from the preoperative refractive target was calculated with different formulas (Barrett Universal II, Hoffer Q, Holladay I, and SRK/T)...
March 12, 2018: Eye
https://www.readbyqxmd.com/read/29525618/new-algorithm-for-toric-intraocular-lens-power-calculation-considering-the-posterior-corneal-astigmatism
#12
Carmen Canovas, Aixa Alarcon, Robert Rosén, Sanjeev Kasthurirangan, Joseph J K Ma, Douglas D Koch, Patricia Piers
PURPOSE: To assess the accuracy of toric intraocular lens (IOL) power calculations of a new algorithm that incorporates the effect of posterior corneal astigmatism (PCA). SETTING: Abbott Medical Optics, Inc., Groningen, the Netherlands. DESIGN: Retrospective case report. METHODS: In eyes implanted with toric IOLs, the exact vergence formula of the Tecnis toric calculator was used to predict refractive astigmatism from preoperative biometry, surgeon-estimated surgically induced astigmatism (SIA), and implanted IOL power, with and without including the new PCA algorithm...
March 7, 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29502613/wang-koch-formula-for-optimization-of-intraocular-lens-power-calculation-evaluation-at-a-canadian-center
#13
Marko Popovic, Matthew B Schlenker, Xavier Campos-Möller, Austin Pereira, Iqbal Ike K Ahmed
PURPOSE: To externally validate the Wang-Koch method for optimization of intraocular lens (IOL) formulas. SETTING: TLC Laser Eye Centre, Mississauga, Ontario, Canada. DESIGN: Retrospective case series. METHODS: Consecutive cataract patients with an axial length (AL) of 25.0 mm or longer were recruited. The predicted postoperative spherical equivalents (SEs) calculated from the Holladay 1 formula were compared with the 3-week postoperative SEs to yield prediction errors for Wang-Koch adjusted and unadjusted ALs...
January 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29498180/accuracy-of-intraocular-lens-power-calculation-formulas-in-long-eyes-a-systematic-review-and-meta-analysis
#14
Qiwei Wang, Wu Jiang, Tiao Lin, Yi Zhu, Chuan Chen, Haotian Lin, Weirong Chen
IMPORTANCE: Visual outcome after intraocular lens (IOL) implantation in long eyes is considerably affected by IOL power calculation. Various formulas have been designed to achieve an accurate IOL power prediction. However, controversy about the accuracy remains. BACKGROUND: To evaluate the accuracy of IOL power calculation formulas in long eyes. DESIGN: Meta-analysis. PARTICIPANTS: Patients with ocular axial length (AL) over 24...
March 2, 2018: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/29450545/use-of-the-posterior-anterior-corneal-curvature-radii-ratio-to-improve-the-accuracy-of-intraocular-lens-power-calculation-eom-s-adjustment-method
#15
Mingue Kim, Youngsub Eom, Hwa Lee, Young-Woo Suh, Jong Suk Song, Hyo Myung Kim
Purpose: To evaluate the accuracy of IOL power calculation using adjusted corneal power according to the posterior/anterior corneal curvature radii ratio. Methods: Nine hundred twenty-eight eyes from 928 reference subjects and 158 eyes from 158 cataract patients who underwent phacoemulsification surgery were enrolled. Adjusted corneal power of cataract patients was calculated using the fictitious refractive index that was obtained from the geometric mean posterior/anterior corneal curvature radii ratio of reference subjects and adjusted anterior and predicted posterior corneal curvature radii from conventional keratometry (K) using the posterior/anterior corneal curvature radii ratio...
February 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29403584/visual-outcomes-and-refractive-status-after-combined-silicone-oil-removal-cataract-surgery-with-intraocular-lens-implantation
#16
Hussain F Al-Habboubi, Waseem Al-Zamil, Ali A Al-Habboubi, Rajiv Khandekar
Purpose: To evaluate refractive status and identify predictors of surgical success following a combined silicone oil removal/cataract surgery with intraocular lens (IOL) implantation procedure. Methods: In this single-armed, retrospective study, we reviewed patients who underwent vitreoretinal surgery followed by a combined silicone oil removal/cataract surgery procedure between 2009 and 2013. Preoperative data included patient demographics, refractive status, IOL power, and axial length (measured with the IOL Master)...
January 2018: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29360197/clinical-outcomes-with-distance-dominant-multifocal-and-monofocal-intraocular-lenses-in-post-lasik-cataract-surgery-planned-using-an-intraoperative-aberrometer
#17
Bret Fisher, Rick Potvin
IMPORTANCE: Studies evaluating the clinical benefits of intraoperative aberrometry (IA) in cataract surgery are limited. BACKGROUND: The study was designed to determine whether IA improved clinical outcomes of post-laser in situ keratomileusis (LASIK) cataract surgery with different intraocular lenses (IOLs) implanted. DESIGN: A retrospective chart review of clinical outcomes from one surgeon at one surgical centre was conducted. It included post-LASIK cataract surgeries where IA was used for the confirmation of IOL power, with either a distant-dominant multifocal IOL or a monofocal IOL implanted...
January 23, 2018: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/29358627/predictability-of-intraocular-lens-power-calculation-for-cataract-with-keratoconus-a-multicenter-study
#18
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
https://www.readbyqxmd.com/read/29308773/evaluation-of-visual-outcomes-after-toric-intraocular-lens-implantation
#19
H R Ng, C H Goh, Y S Ngim, J Juliana
PURPOSE: To evaluate postoperative visual acuity, refractive status and rotational stability of toric intraocular lens (IOL) in correcting pre-existing corneal astigmatism. METHODS: A total of 69 patients with topographic corneal astigmatism of 1.0 Diopter (D) and above who underwent cataract surgery between June 2015 and December 2016 were included in this retrospective observational study. All preoperative toric IOL calculations were performed using immersion biometry...
December 2017: Medical Journal of Malaysia
https://www.readbyqxmd.com/read/29282016/influence-of-corneal-power-on-intraocular-lens-power-of-the-second-eye-in-the-srk-t-formula-in-bilateral-cataract-surgery
#20
Young Choi, Youngsub Eom, Jong Suk Song, Hyo Myung Kim
BACKGROUND: To evaluate the effect of different adjustments of the refractive outcome of the first eye according to corneal power (K) in order to improve the intraocular lens (IOL) power calculation of the second eye in the SRK/T formula. METHODS: One hundred thirty-four patients who underwent uncomplicated bilateral, sequential phacoemulsification with AcrySof IQ implantation were enrolled. The optimal partial adjustment of the refractive outcome of the first eye according to K was retrospectively analyzed using a regression formula...
December 28, 2017: BMC Ophthalmology
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