Publications by authors named "David L Cooke"
Purpose: To describe the Shammas-Cooke formula, an updated no-history (NH) formula for IOL calculation in eyes with prior myopic laser vision correction (M-LVC), and to compare the results with the Shammas PL, Haigis-L, and Barrett True-K NH formulas.
Setting: Bascom Palmer Eye Institute (BPEI), The Lennar Foundation Medical Center, University of Miami, Miami, Florida; Dean A. McGee Eye Institute (DMEI), University of Oklahoma, Oklahoma City, Oklahoma; and private practice, Lynwood, California, and St Joseph, Michigan.
Purpose: To characterize the variability of keratometry measurements on the IOLMaster 700, and relate it to device image quality indicators (QI).
Setting: Two academic centers and one private practice.
Design: Multicenter, retrospective consecutive case series.
A plasma device has been created to study dynamic plasma coupling in an E × B-drifting magnetized plasma. The E × B magnetized plasma device is a 1.2 m diameter by 2 m long cylindrical chamber with two sets of Helmholtz coils in a mirror configuration.
View Article and Find Full Text PDFObjective: To describe a novel method called "three variable optimization" that entails a process of doing just one calculation to zero out the mean prediction error of an entire dataset (regardless of size), using only 3 variables: (1) the constant used, (2) the average intraocular lens (IOL) power, and (3) the average prediction error (PE as actual refraction - predicted refraction).
Design: Development, evaluation, and testing of a method to optimize personal IOL constants.
Methods: A dataset of 876 eyes was used as a training set, and another dataset of 1,079 eyes was used to test the method.
Purpose: To compare the refractive accuracy of legacy and new no-history formulas in eyes with previous myopic laser vision correction (M-LVC).
Design: Retrospective cohort study.
Methods: Setting: Two academic centers Study Population: 576 eyes (400 patients) with previous M-LVC that underwent cataract surgery between 2019-2023.
Leaving trusted paths: Estimating corneal keratometric index in cataract surgery eyes with zero-power implants.
Graefes Arch Clin Exp Ophthalmol
August 2024
Purpose: This study aimed to estimate the corneal keratometric index in the eyes of cataract surgery patients who received zero-power intraocular lenses (IOLs).
Methodology: This retrospective study analyzed postoperative equivalent spherical refraction and axial length, mean anterior curvature radius and aqueous humor refractive index to calculate the theoretical corneal keratometric index value (n). Data was collected from 2 centers located in France and Germany.
This study considered two questions associated with intraocular lens (IOL) power and refraction: (1) Given a refraction with a particular IOL in the eye, what will be the refraction for the IOL or another IOL if located differently with regard to tilt or anterior-posterior position? (2) For a target refraction, what is the power of another IOL if located differently with regard to tilt or position? A thin lens technique was developed to address these questions. For the first question, light was traced through the initial correcting spectacle lens to the cornea, refracted at the cornea, transferred to the position of the initial IOL, refracted at this IOL, transferred to the position of a new IOL (which may be the same IOL but with a different position and/or tilt), refracted backwards through the new IOL, transferred to the cornea and refracted out of the eye to give a new correcting spectacle lens power. For the second question, light was traced through the initial correcting spectacle lens to the cornea, refracted at the cornea, transferred to the position of the initial IOL, refracted at the initial IOL and transferred to the position of a new IOL.
View Article and Find Full Text PDFThis study evaluates the accuracy of a newly developed intraocular lens (IOL) power calculation method that applies four different IOL power calculation formulas according to 768 biometric subgroups based on keratometry, anterior chamber depth, and axial length. This retrospective cross-sectional study was conducted in at Korea University Ansan Hospital. A total of 1600 eyes from 1600 patients who underwent phacoemulsification and a ZCB00 IOL in-the-bag implantation were divided into two datasets: a reference dataset (1200 eyes) and a validation dataset (400 eyes).
View Article and Find Full Text PDFPurpose: The proper selection of an intraocular lens power calculation formula is an essential aspect of cataract surgery. This study evaluated the accuracy of artificial intelligence-based formulas.
Design: Systematic review.
Purpose: To evaluate prediction accuracy of pre- and post-DMEK keratometry (K) and total keratometry (TK) values for IOL power calculations in Fuchs endothelial corneal dystrophy (FECD) eyes undergoing DMEK with cataract surgery (triple DMEK).
Methods: Retrospective cross-sectional multicenter study of 55 FECD eyes (44 patients) that underwent triple DMEK between 2019 and 2022 between two centers in USA and Europe. Swept-source optical coherence tomography biometry (IOLMaster 700) was used for pre- and post-DMEK measurements.
Purpose: This study aimed to explore the concept of total keratometry (TK) by analyzing extensive international datasets representing diverse ethnic backgrounds. The primary objective was to quantify the disparities between traditional keratometry (K) and TK values in normal eyes and assess their impact on intraocular lens (IOL) power calculations using various formulas.
Design: Retrospective multicenter intra-instrument reliability analysis.
A thin lens technique was developed to determine how the effective powers of toric monofocal intraocular lenses (IOLs) are influenced by tilt and the refractive errors associated with the tilt. A series of steps determined the effective power of the cornea at the IOL, the IOL power, the effective power of the tilted IOL, the correction required at the front of the eye and the power of an IOL that would compensate for the tilt. The correction was determined by starting at the ideal reduced image vergence at the IOL, backwards raytracing to obtain a reduced image vergence at the cornea, and subtracting the cornea power from this reduced image vergence.
View Article and Find Full Text PDFBackground: To evaluate the feasibility of creating flanges using an optic piercing technique with a 6 - 0 polypropylene monofilament for scleral fixation of dislocated one-piece diffractive multifocal intraocular lenses (IOLs).
Study Design: Experimental study and case series.
Subjects: Optical bench test and eyes with IOL dislocation.
Determining specified intraocular lens powers when silicone oil is to be used in the vitreous chamber.
J Cataract Refract Surg
August 2023
Purpose: To apply a theoretical approach to determining how specified intraocular lens (IOL) powers should change when vitreous oil substitution is combined with IOL implantation.
Setting: University laboratory, private Ophthalmological practice.
Design: Theoretical raytracing.
Purpose: To evaluate the accuracy of various variations of new-generation multivariate intraocular lens (IOL) power calculation using the Barrett Universal II, Castrop, Emmetropia Verifying Optical 2.0, Hill-Radial Basis Function 3.0, Kane, and PEARL-DGS formulas with and without optional biometric parameters.
View Article and Find Full Text PDFPurpose: To compare the utility of keratometry vs total keratometry (TK) for intraocular lens power calculations in eyes with keratoconus (KCN) using KCN and non-KCN formulae.
Design: Retrospective cohort study.
Methods: This study was conducted at 2 academic centers and included 87 eyes in 67 patients who underwent cataract surgery between 2019 and 2021.
Purpose: To scrutinize the accuracy of 24 intraocular lens (IOL) power calculation formulas in unoperated eyes.
Methods: In a series of consecutive patients undergoing phacoemulsification and implantation of the Tecnis 1 ZCB00 IOL (Johnson & Johnson Vision), the following formulas were evaluated: Barrett Universal II, Castrop, EVO 2.0, Haigis, Hoffer Q, Hoffer QST, Holladay 1, Holladay 2, Holladay 2 (AL Adjusted), K6 (Cooke), Kane, Karmona, LSF AI, Naeser 2, OKULIX, Olsen (OLCR), Olsen (standalone), Panacea, PEARL-DGS, RBF 3.
Purpose: To compare the prediction accuracy of standard keratometry (K) and total keratometry (TK) for intraocular lens (IOL) power calculation in eyes undergoing combined cataract surgery and Descemet membrane endothelial keratoplasty (triple DMEK).
Setting: Tertiary care academic referral center.
Design: Retrospective case series.
Surgeons need to know more about intraocular lens design for accurate power calculation.
J Cataract Refract Surg
June 2023
Improvement in biometry and formulas has raised the bar for accurate intraocular lens (IOL) power calculation. However, when we look closely at the performance of a specific IOL model, we often find that the prediction error varies with the implant power. This phenomenon has no explanation other than that the optic design of the IOL has shifted over the power range, thereby disrupting the assumptions of the calculations.
View Article and Find Full Text PDFArticle Synopsis
- - The study introduces a new index called Cooke-Riaz-Wendelstein (CRW1) that utilizes swept-source optical coherence tomography (SS-OCT) measurements to indicate if a measured eye has a history of myopic laser vision correction (M-LVC).
- - Conducted across six centers, the research analyzed data from 49,199 eyes and found that the CRW1 Index had a positive predictive value (PPV) of 93%, outperforming previous methods in identifying eyes with M-LVC.
- - The CRW1 index provides a convenient and efficient tool for surgeons to detect eyes with a high likelihood of previous M-LVC using only basic SS-OCT measurements.
Purpose: To analyze Abulafia-Koch regression (AKRT), anterior and posterior astigmatism (K and TK), and evaluate biometry data in a large population.
Design: Retrospective cross-sectional study.
Methods: This multicenter (2 tertiary care centers) study analyzed datasets acquired between 2017 and 2020.
Article Synopsis
- A phase I/II study evaluated the effectiveness of H-1337 ophthalmic solution in treating primary open-angle glaucoma (POAG) or ocular hypertension (OHT) among 87 participants.
- The study compared different concentrations of H-1337 against a vehicle (placebo), measuring changes in intraocular pressure over 28 days.
- Results indicated that H-1337 significantly reduced intraocular pressure compared to the vehicle, with a notable incidence of mild adverse events but a low rate of serious side effects.