Purpose: To compare the accuracy and predictability of different intraocular lens (IOL) power calculation methods in eyes after myopic excimer laser surgery.
Methods: Phacoemulsification and IOL implantation outcomes in 37 eyes of 37 patients with prior LASIK or photorefractive keratectomy were documented (amount of correction=-6.92+/-3.12 diopters (D), range: -2.00 to -13.00 D). The theoretical IOL power that would have resulted in emmetropia was calculated (IOLemme). Using the clinical history keratometry and biometry, the IOL power was calculated using the following methods: Sanders, Retzlaff, Kraff (SRK)-T, SRK-T Double-K (DK), Holladay 1 DK, Hoffer Q DK, Holladay 2 DK, Feiz-Mannis, and Ladas-Stark corneal bypass. The calculated IOL power was compared to IOLemme and used to determine the mean error and mean absolute error of refractive outcome for each eye.
Results: The calculated IOL power using the SRK-T, Feiz-Mannis, and Holladay 1 DK methods were significantly different from IOLemme. The lowest mean absolute error was achieved using the Hoffer Q DK method (0.75+/-0.52 D), Holladay 2 DK (0.75+/-0.62 D), SRK-T DK (0.76+/-0.60 D), and Ladas-Stark (0.83+/-63 D). With the SRK-T DK method, 51.4% of eyes were within +/-0.50 D of emmetropia and 67.6% of eyes were within +/-1.00 D. The Holladay 2 DK method had the highest percentage (81.1%) of eyes within +/-1.00 D and 45.9% within +/-0.50 D.
Conclusions: The refractive results of IOL implantation using the same biometry data in eyes after LASIK can vary markedly. The SRK-T DK, Hoffer Q DK, and Holladay 2 DK methods resulted in the highest accuracy.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.3928/1081597X-20080401-07 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Visual and Refractive Outcomes After Bilateral Implantation of a New Toric Intraocular Lens.
Clin Ophthalmol
December 2024
The Department of Ophthalmology, The Shammas Eye Medical Center, Lynwood, CA, USA.
Purpose: To evaluate the clinical outcomes of a new FDA approved toric aspheric hydrophobic acrylic intraocular lens.
Patients And Methods: This is a single surgeon, single-arm, on-label, non-randomized, prospective observational study. Thirty patients underwent bilateral cataract surgery (60 eyes) with placement of a Clareon™ Toric IOL in each eye.
Comparison of Intraocular Lens Formulas in Patients With Postoperative Refractive Surprise.
Cureus
December 2024
Ophthalmology, University of Washington, Seattle, USA.
Objective: This study investigates the refractive accuracy of eight intraocular lens (IOL) power calculation formulas in patients with postoperative refractive surprise after phacoemulsification. It aims to determine if a different formula could result in better refractive outcomes in these eyes.
Methods And Analysis: We retrospectively reviewed consecutive patients undergoing uncomplicated phacoemulsification as a sole procedure between March 2007 and September 2020 at the University of Washington by glaucoma subspecialists as part of a study investigating cataract surgery in normal eyes.
Redefined Formula for Anterior Chamber Volume Calculation: Quantitative Analysis of Biometric Parameters Across Ocular Pathologies.
Clin Ophthalmol
December 2024
Riga Stradins University, Department of Ophthalmology, Riga, Latvia.
Purpose: This study evaluates the discrepancies between ACV measurements obtained from the Heidelberg Anterion and Zeiss IOLMaster 700 and investigates the significance of ACV and other ocular biometry parameters.
Patients And Methods: To investigate intraocular fluid circulation, a robust formula was developed for ACV measurement using the Zeiss IOLMaster 700. A pilot study was conducted to validate this formula, which relied on WTW, CCT, and ACD.
Comparison of ocular biometry and refractive outcomes using two swept-source optical coherence tomography-based biometers.
PLoS One
December 2024
Department of Ophthalmology, Samsung Medical Center School of Medicine, Sungkyunkwan University, Seoul, Republic of Korea.
Background: To evaluate the ocular biometry agreement and prediction of postoperative refractive outcomes obtained using two swept-source optical coherence tomography (SS-OCT) biometers: Anterion (Heidelberg Engineering, Heidelberg, Germany) and Argos (Alcon, Fort Worth, TX, USA).
Methods: Ambispective analysis was conducted on 105 eyes at the Samsung Medical Center, Seoul, Republic of Korea, between June 2021 and March 2022. Biometric values were assessed using both devices before cataract surgery.
Inducing cylindrical and spherical defocus after implantation with new generation intraocular lenses improves intermediate and near visual acuity.
Sci Rep
December 2024
Imaging, Biomechanics and Mathematical Modelling Solutions Lab, Narayana Nethralaya Foundation, Bangalore, India.
An induced cylinder and spherical power after implantation with an extended depth of focus (EDOF) and enhanced monofocal intraocular lens (IOL) could improve distance, intermediate (60 cm) and near (40 cm) visual acuity (VA). In this prospective study, forty eyes with Eyhance EDOF IOL (Johnson and Johnson, USA) and 40 eyes with Vivity EDOF IOL (Alcon Laboratories Inc. USA) were included.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!