Medical optics—aaaah

2020 ◽  
Author(s):  
William L Wolfe
Keyword(s):  
Medical Optics

scholarly journals Usefulness of Surgical Media Center as a Cataract Surgery Educational Tool

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Tomoichiro Ogawa ◽  
Takuya Shiba ◽  
Hiroshi Tsuneoka
Keyword(s):  
Cataract Surgery ◽  
Surgical Procedures ◽  
Intraoperative Complications ◽  
Recording Device ◽  
Educational Tool ◽  
Intraoperative Complication ◽  
Vacuum Level ◽  
Media Center ◽  
Medical Optics ◽  
Education Tool

Purpose.This study retrospectively analyzed cataract surgeries to examine the usefulness of Surgical Media Center (SMC) (Abbott Medical Optics Inc.), a new cataract surgery recording device, for training of cataract surgery.Methods.We studied five hundred cataract surgeries conducted with a phacoemulsification system connected to the SMC. After surgery, the surgical procedures were reviewed, with changes in aspiration rate, vacuum level, and phaco power displayed as graphs superimposed on the surgical video. We examined whether use of SMC is able to demonstrate the differences in technique between experienced and trainee operators, to identify inappropriate phacoemulsification techniques from analyzing the graphs, and to elucidate the cause of intraoperative complications.Results. Significant differences in the time taken to reach maximum vacuum and the speed of increase in vacuum during irrigation and aspiration were observed between experienced and trainee operators. Analysis of the graphs displayed by SMC detected inappropriate phacoemulsification techniques mostly in cases operated by trainee operators.Conclusions. Using SMC, it was possible to capture details of cataract surgery objectively. This recording device allows surgeons to review cataract surgery techniques and identify the cause of intraoperative complication and is a useful education tool for cataract surgery.

The Hard Facts on GP Contact Lens Care

The Eye ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 53-57
Author(s):  
M. Conway
Keyword(s):  
Contact Lens ◽  
Contact Lenses ◽  
Ocular Disease ◽  
Medical Optics

The article is designed to explain the various steps needed to be undertaken daily to keep gas permeable (GP) contact  lenses clean, wettable, and free from pathogens that could cause ocular disease. It explains why the steps need to be performed and what the adverse consequences of failing to perform them might be.Translation of the article: Ruslan Tahaveev (Academy of Medical Optics and Optometry

scholarly journals Effect of Spherical Aberration on the Optical Quality after Implantation of Two Different Aspherical Intraocular Lenses

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Michael Lasta ◽  
Kata Miháltz ◽  
Illés Kovács ◽  
Pia Veronika Vécsei-Marlovits
Keyword(s):  
Contrast Sensitivity ◽  
Pupil Size ◽  
Spherical Aberration ◽  
Optical Quality ◽  
Intraocular Lenses ◽  
Strehl Ratio ◽  
Minimum Diameter ◽  
Link Type ◽  
Medical Optics ◽  
Aspherical Iol

Purpose. To compare the effect of spherical aberration on optical quality in eyes with two different aspherical intraocular lenses. Methods. 120 eyes of 60 patients underwent phacoemulsification. In patients’ eyes, an aberration-free IOL (Aspira-aA; Human Optics) or an aberration-correcting aspherical IOL (Tecnis ZCB00; Abott Medical Optics) was randomly implanted. After surgery, contrast sensitivity and wavefront measurements as well as tilt and decentration measurements were performed. Results. Contrast sensitivity was significantly higher in eyes with Aspira lens under mesopic conditions with 12 cycles per degree (CPD) and under photopic conditions with 18 CPD (p=0.02). Wavefront measurements showed a higher total spherical aberration with a minimal pupil size of 4 mm in the Aspira group (0.05 ± 0.03) than in the Tecnis group (0.03 ± 0.02) (p=0.001). Strehl ratio was higher in eyes with Tecnis (0.28 ± 0.17) with a minimal pupil size larger than 5 mm than that with Aspira (0.16 ± 0.14) (p=0.04). In pupils with a minimum diameter of 4 mm spherical aberration had a significant effect on Strehl ratio, but not in pupils with a diameter less than 4 mm. Conclusions. Optical quality was better in eyes with the aberration-correcting Tecnis IOL when pupils were large. In contrast, this could not be shown in eyes with pupils under 4 mm or larger. This trial is registered with Clinicaltrials.gov NCT03224728.

A Fluidics Comparison of Alcon Infiniti, Bausch & Lomb Stellaris, and Advanced Medical Optics Signature Phacoemulsification Machines

2008 ◽  
Vol 145 (6) ◽  
pp. 1014-1017.e1 ◽  
Author(s):  
Dan Georgescu ◽  
Annie F. Kuo ◽  
Krista I. Kinard ◽  
Randall J. Olson
Keyword(s):  
Medical Optics

scholarly journals Multifocal Toric Intraocular Lenses

2017 ◽  
Vol 11 (01) ◽  
pp. 23
Author(s):  
Tiago Bravo Ferreira ◽  
Keyword(s):  
Cataract Surgery ◽  
Intraocular Lens ◽  
Intraocular Lenses ◽  
Multifocal Intraocular Lens ◽  
Iol Implantation ◽  
Medical Optics ◽  
Toric Iols ◽  
Recent Developments ◽  
Correction Of Astigmatism

Meticulous correction of astigmatism during cataract surgery is mandatory in cases of multifocal intraocular lens (IOL) implantation. Toric multifocal IOLs allow predictable astigmatic correction during cataract surgery. In this editorial, we review our investigation on the Tecnis ZMT IOL (Abbott Medical Optics, CA, US) as well as other recent developments in multifocal toric IOLs.

scholarly journals Verisyse versus Veriflex Phakic Intraocular Lenses: Refractive Outcomes and Endothelial Cell Density 5 Years after Surgery

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Dilek Yaşa ◽  
Alper Ağca
Keyword(s):  
Visual Acuity ◽  
Endothelial Cell ◽  
Cell Density ◽  
Endothelial Cell Density ◽  
Intraocular Lenses ◽  
Distance Visual Acuity ◽  
Medical Optics ◽  
Significant Difference ◽  
Phakic Intraocular Lenses

Purpose. To compare refractive stability, central endothelial cell density (ECD), and complications between Verisyse (Abbott Medical Optics, Netherlands) and Veriflex (Abbott Medical Optics, Netherlands) phakic intraocular lenses (pIOL) over five years.Methods. We retrospectively reviewed the medical records of patients who underwent Verisyse or Veriflex pIOL implantation for surgical correction of myopia. Patients with a 5-year follow-up period were included in the study. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), spherical equivalent of manifest refraction (SE), and ECD were compared between the groups preoperatively and 1, 3, and 5 years postoperatively.Results. The study included 47 eyes in the Verisyse group and 50 eyes in the Veriflex group. There was no significant difference in mean SE, UDVA, CDVA, and ECD preoperatively or postoperatively. In both groups, there was a statistically significant myopic shift between 1-year and 5-year visits (−0.25 ± 0.30 D and −0.23 ± 0.48 D in the Verisyse and Veriflex groups, respectively). There was no significant difference between the groups in terms of efficacy and safety indexes at 5 years. ECD loss was highest during the first year (3.9% loss in the Verisyse group and 3.9% loss in the Veriflex group,p=0.670). At 5 years, the mean cumulative ECD losses in the Verisyse and Veriflex groups were 7.42% and 7.64%, respectively (p=0.709). Cataracts developed in 2.1% of the eyes in the Verisyse group and in 2.0% of those in the Veriflex group. No sight-threatening complications were observed.Conclusion. Verisyse and Veriflex pIOLs are highly effective for treating high myopia up to 5 years after surgery. Longitudinal studies with longer follow-up periods are necessary to determine the endothelial safety profile.

Auswirkungen der Nahaddition auf die optische Qualität von diffraktiven multifokalen Intraokularlinsen – eine Laborstudie an der optischen Bank

2017 ◽  
Vol 234 (12) ◽  
pp. 1533-1539
Author(s):  
Tamer Tandogan ◽  
Gerd Auffarth ◽  
Stephanie Liebing ◽  
Chul Choi ◽  
Ramin Khoramnia
Keyword(s):  
United States ◽  
Transfer Function ◽  
Air Force ◽  
Modulation Transfer Function ◽  
United States Air Force ◽  
Strehl Ratio ◽  
Modulation Transfer ◽  
Medical Optics ◽  
Optische Qualität

Zusammenfassung Ziel Analyse und Vergleich der optischen Qualität diffraktiver multifokaler Intraokularlinsen (IOL) mit unterschiedlichen Nahadditionen mithilfe einer optischen Bank im Rahmen einer Laborstudie. Methode Die AcrySof® IQ ReSTOR® + 2.5 D SV25T0 (Alcon, USA), die AcrySof® IQ ReSTOR® + 3.0 D SN6AD1 (Alcon, USA) sowie die TECNIS® ZMA00 und ZMB00 (Abbott Medical Optics, USA) mit einer Brechkraft von 21 dpt für die Ferne wurden an der optischen Bank OptiSpheric® IOL PRO (TRIOPTICS GmbH, Wedel) untersucht. Das optische Design dieser Linsen ist ähnlich, die Modelle unterscheiden sich allerdings hinsichtlich ihrer Nahaddition: Die AcrySof IQ ReSTOR + 2.5 D hat eine Nahaddition von + 2,5 dpt, die AcrySof IQ ReSTOR + 3.0 D eine Nahaddition von + 3,0 dpt und beide TECNIS-Linsen eine Nahaddition von + 4,0 dpt. Untersucht wurden die Fläche unterhalb der Kurve der Modulationstransferfunktion (Modulation Transfer Function Area, MTFA) und die Strehl Ratio. Weiterhin wurden die Abbildungseigenschaften der IOL mithilfe von USAF-Target-Bildern (USAF: United States Air Force) qualitativ miteinander verglichen. Ergebnis Die MTFA-Werte für den Fernfokus waren im Median 47,85/42,06/33,57 (2,5 dpt/3,0 dpt/4,0 dpt). Für den Intermediärfokus erreichten die MTFA-Werte 11,05/9,54/8,60. Die MTFA-Werte für den Nahfokus waren 20,11/29,50/33,39. Die Strehl Ratio des Fernfokus betrug 0,48/0,42/0,29. Für den Intermediärfokus war die Strehl Ratio 0,11/0,10/0,09. Die Strehl Ratio des Nahfokus betrug 0,20/0,30/0,34. Die USAF-Target-Bilder korrelierten mit diesen Messwerten. Schlussfolgerung Für den Nahfokus erzielen die ZMA00 und ZMB00 die besten Ergebnisse, während die IQ ReSTOR + 2.5 D am schlechtesten abschneidet. Im Intermediärbereich erreichen alle IOL ähnliche Ergebnisse. Für den Fernfokus erzielt die IQ ReSTOR + 2.5 D die besten Ergebnisse. Da heutzutage diverse Nahadditionen bei diffraktiven multifokalen IOL zur Verfügung stehen, kann die Wahl der richtigen Linse individuell auf die Bedürfnisse jedes Patienten abgestimmt werden.

scholarly journals Aphakia korrekciója irisklip műlencse retropupillaris beültetésével

2017 ◽  
Vol 158 (1) ◽  
pp. 20-24
Author(s):  
Antal Szabó ◽  
András Papp ◽  
Ágnes Borbándy ◽  
Zsuzsanna D. Géhl ◽  
Zoltán Zsolt Nagy ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Intraocular Lens ◽  
Secondary Procedure ◽  
Medical Optics ◽  
Corrected Visual Acuity ◽  
Time Period ◽  
The Mean ◽  
The Stability ◽  
Best Corrected Visual Acuity

Abstract: Introduction and aim: The correction of aphakia might be a challenge for the surgeon. The aim of this study is to describe the authors’ experience with the implantation of the retropupillary iris clip intraocular lens. Method: Patients between January 2014 and December 2015 were included in the retrospective study. Retropupillary implantation of iris clip intraocular lens VRSA 54 (AMO Advanced Medical Optics, USA) was performed in all cases. The minimum follow up period was three months. The stability of the intraocular lens and the intraoperative and postoperative complications and the visual acuity were evaluated. Results: During this time period 11 cases (1 female, 10 males) were included in the study. The mean age at the time of the implantation was 57.7 years (between 25–74 years). In 4 cases the iris clip lens was implanted during the first intervention, in 7 cases during the secondary procedure. In all cases the lens was fixated onto the iris posteriorly. The best corrected visual acuity before the iris clip implantation was 0.43 (0.1–1.0) and postoperatively at the time of the follow up 0.49 (0.04–1.0). Conclusions: With the use of the retropupillary implanted iris clip intraocular lens all of the patients could have been rehabilitated without major complications. Orv. Hetil., 2017, 158(1), 20–24.

scholarly journals Explantation and Rotation of Intracorneal Ring Segments with the Support of Femtosecond Laser: An Asymmetrical Version

2013 ◽  
Vol 2 (1) ◽  
pp. 40-42
Author(s):  
E Levinger ◽  
S Levinger ◽  
A Hirsh
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Lower Segment ◽  
Medical Optics ◽  
Corrected Visual Acuity ◽  
Body Sensation ◽  
Uncorrected Visual Acuity ◽  
The Right ◽  
Visual Results

ABSTRACT Purpose To report a 25-year-old man who presented with advance keratoconus in the right eye with uncorrected visual acuity (UCVA) of 0.2 and best spectacle-corrected visual acuity (BSCVA) of 0.33 with +0.50 −9.25 × 45°. Materials and methods Clinical examination and corneal topography revealed grade III keratoconus in the right eye. Intracorneal ring segments (INTACS SK; Addition Technology, Des Plaines, IL) were implanted without surgical complications at 400 µm, with the 450 µm segments implanted superiorly and inferiorly using the femtosecond laser (Intralase®, Advanced Medical Optics, Inc, Abbott Park, IL). Results For 3 months postoperatively, BSCVA remained at 0.5 with plano −4.50 × 25°. The patient was complaining of foreign body sensation in the upper part of the eye and glare asking the surgeon to remove the two segments. The superior segment was removed and the lower segment was rotated 30° counter clockwise. Three months later, UCVA was 0.67 and remained stable for 24 months of follow-up. Conclusion This report shows that implanting the thicker segment inferiorly provides better visual results. How to cite this article Levinger E, Levinger S, Hirsh A. Explantation and Rotation of Intracorneal Ring Segments with the Support of Femtosecond Laser: An Asymmetrical Version. Int J Kerat Ect Cor Dis 2013;2(1):40-42.

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