Publications by authors named "Jeff H Pettey"
Purpose: This study aims to investigate the differences between the heat energy produced during cataract surgery and Cumulative dissipated energy (CDE). CDE is often used as a medium for understanding the energy delivered to the eye during cataract surgery. However, the actual energy produced at the tip level of the tip is not well understood.
View Article and Find Full Text PDFObjectives: To analyse the accuracy of artificial intelligence (AI)-driven intraocular (IOL) calculation formulae, together with established formulae using the heteroscedastic methodology and the Eyetemis Analysis Tool.
Methods: Data from 404 eyes who underwent uneventful phacoemulsification with implantation of the SN60WF IOL were retrospectively reviewed. IOL power calculations were performed using the Barrett Universal II (BUII), EVO 2.
Purpose: To assess the accuracy of intraocular lens (IOL) power calculation in different age groups using various IOL calculation formulas.
Methods: Data from 421 eyes of 421 patients ≥60 years old (ages: 60-69, n = 131; 70-74, n = 105; 75-84, n = 158 and ≥85, n = 27), who underwent uneventful cataract surgery with SN60WF IOL implantation at John A. Moran Eye Center, Salt Lake City, USA, were retrospectively obtained.
Purpose: To evaluate efficiency of grooving, nuclear fragment removal, and changes in pressure control in the Oertli Faros using traditional peristaltic and Speed and Precision (SPEEP) features. The SPEEP mode uses novel peristaltic technology permitting independent control of flow and vacuum.
Methods: A porcine lens model was used with an enclosed chamber simulating the anterior segment.
Efficiency of a polymer-coated phacoemulsification tip in cataract surgery.
J Cataract Refract Surg
October 2023
Purpose: To determine whether there is a difference in efficiency during phacoemulsification when using the hybrid polymer tip compared with the metal balanced tip, as measured by cumulative dissipated energy (CDE) and total procedure time.
Setting: John A. Moran Eye Center, University of Utah, Salt Lake City, Utah.
Purpose: To understand the role of ophthalmic viscosurgical devices (OVDs) in corneal incision contracture (CIC). Specifically, the aim was to evaluate with the tip of the phacoemulsification needle free of OVD, how various OVDs near the tip and sleeve may transmit thermal energy to the incision site.
Methods: A small chamber was filled with balanced saline solution (BSS), and a thin membrane was placed on the surface.
Purpose: To determine the difference, if any, in grooving efficiency at various settings on the Whitestar Signature Pro phacoemulsification (phaco) system.
Methods: Cataractous lenses were simulated by exposing porcine lenses to formalin for 2 hours. A total of 120 lenses were analyzed at various power settings on both longitudinal and transversal handpieces.
The Navajo Nation is the largest Native American reservation by area and citizenship. The study sought to provide the first large-scale examination of ocular pathology within this population. A retrospective review of all Navajo patients seen at Moran Eye Center Navajo Nation Outreach Clinics from 2013 to 2021 for demographics, visual acuity, refractive, and eye pressure data was undergone.
View Article and Find Full Text PDFObjective: To study the thermal properties and response magnitude of a forced-infusion phacoemulsification machine on 4 ophthalmic viscosurgical devices (OVDs).
Design: Experimental study.
Methods: A phacoemulsification tip, thermocouple, and gauge were placed into an artificial anterior chamber with balanced saline solution (BSS) or approximately 0.
Purpose: To determine the actual vacuum pressure generated by the Oertli CataRhex 3 (Oertli), using an external measuring system.
Methods: The effective vacuum pressure created by the Oertli was measured with a pressure device that was continuous with the vacuum tubing system while closed to the external environment. Measurements were taken with the machine set to 300 and 500 mmHg at flow rates of 20, 35, and 50 mL/min and at bottle heights of 60, 80, and 100 cm.
Purpose: To describe gender representation at 8 national ophthalmology conferences, stratified by role, session category, and subspecialty.
Design: Retrospective cross-sectional study.
Methods: Data were examined on 3817 presenters at the 2019 American Academy of Ophthalmology subspecialty days, American Society of Cataract and Refractive Surgery, American Glaucoma Society, American Society of Retina Specialists, American Society of Ophthalmic Plastic and Reconstructive Surgery, American Association for Pediatric Ophthalmology and Strabismus, North American Neuro-Ophthalmology Society, and American Uveitis Society meetings.
Purpose: To evaluate the effect of each of the tip sizes available for the Oertli CataRhex3 phacoemulsification machine on efficiency.
Methods: Porcine lenses were fixed in formalin for 2 hours, then cut into 3.0 mm cubes.
The aim of this study was to assess efficacy of a virtual, double-flipped clinical rotation in ophthalmology for medical students during the coronavirus disease 2019 (COVID-19) pandemic. We instituted a virtual, reverse-classroom clinical elective for eight medical students interested in ophthalmology as a career. The course included required prework, interactive case-based discussions, and follow-up quizzes (first flip) entirely prepared and delivered by the students as teachers (second flip).
View Article and Find Full Text PDFThis study assesses a new departmental role-a professionalism mentor-who receives sexual harassment reporting, liaisons with campus resources, and organizes educational sessions. Multicenter randomized controlled survey study. Academic ophthalmology departments in the United States were randomized to a professionalism mentor group ( = 9) and a control group ( = 7).
View Article and Find Full Text PDFBackground: The American Indian Navajo and Goshute peoples are underserved patient populations residing in the Four Corners area of the United States and Ibupah, Utah, respectively.
Methods: We conducted a cross-sectional study of epidemiological factors and lipid biomarkers that may be associated with type II diabetes, hypertension and retinal manifestations in tribal and non-tribal members in the study areas (n = 146 participants). We performed multivariate analyses to determine which, if any, risk factors were unique at the tribal level.
Purpose: To evaluate longitudinal power settings for optimally efficient lens fragment removal, using the Centurion machine.
Setting: John A. Moran Eye Center, University of Utah, Salt Lake City, USA.
Purpose: To measure the time to fragment removal and number of chatter events using various combinations of micropulse on times and off times (measured in milliseconds) of longitudinal ultrasound (US) using a venturi-based phacoemulsification system.
Setting: John A. Moran Eye Center, University of Utah, Salt Lake City, USA.
Purpose: The aim of this study was to determine optimal bottle height, vacuum, aspiration rate, and power settings of the Oertli CataRhex 3 phacoemulsification machine.
Methods: Porcine lens nuclei were hardened with formalin and cut into 2.0 mm cubes.
Importance: Although almost equal numbers of male and female medical students enter into ophthalmology residency programs, whether they have similar surgical experiences during training is unclear.
Objective: To determine differences for cataract surgery and total procedural volume between male and female residents during ophthalmology residency.
Design, Setting, Participants: This retrospective, longitudinal analysis of resident case logs from 24 US ophthalmology residency programs spanned July 2005 to June 2017.
Phacoemulsification, initially used in the late 1960s, continues to be the standard of care for cataract removal. An animal model was developed so that, in a controlled research setting, all the various machines, handpieces, tips, and settings could be investigated. As a general rule, the higher power, vacuum, and aspiration settings lead to optimally efficient phacoemulsification.
View Article and Find Full Text PDFPurpose: To determine optimal power settings on the Centurion Vision System during the grooving step in cataract surgery.
Methods: Intact porcine lenses hardened by formalin and placed in a chamber designed to simulate the anterior chamber of the eye were used to test longitudinal power at 40%, 70%, and 100% and torsional power at 0%. Flow rate was set at 40 mL/min.
Objective: To compare relative efficiency and chatter of high aspiration and vacuum settings.
Design: In vitro laboratory study.
Methods: The John A.
Purpose: To examine the role of high vacuum and aspiration settings on efficiency using a transversal ultrasound (US) machine.
Setting: John A. Moran Eye Center Laboratory, University of Utah, Salt Lake City, Utah, USA.
Optimum on-time duty cycle for a transversal ultrasound machine.
J Cataract Refract Surg
September 2018
Purpose: To evaluate the optimum on-time setting for the most efficient removal of lens fragments using micropulse ultrasound (US) and Ellips FX transversal US in the Whitestar Signature Pro phacoemulsification machine.
Setting: John A. Moran Eye Center Laboratories, University of Utah, Salt Lake City, Utah, USA.
Purpose: To determine optimum flow settings on the Centurion Vision System during the grooving step in cataract surgery.
Setting: John A. Moran Eye Center Laboratory, University of Utah, Salt Lake City, Utah, USA.