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Dysphotopsia

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https://www.readbyqxmd.com/read/28433446/functional-magnetic-resonance-imaging-to-assess-the-neurobehavioral-impact-of-dysphotopsia-with-multifocal-intraocular-lenses
#1
Andreia M Rosa, Ângela C Miranda, Miguel Patrício, Colm McAlinden, Fátima L Silva, Joaquim N Murta, Miguel Castelo-Branco
PURPOSE: To investigate the association between dysphotopsia and neural responses in visual and higher-level cortical regions in patients who recently received multifocal intraocular lens (IOL) implants. DESIGN: Cross-sectional study. PARTICIPANTS: Thirty patients 3 to 4 weeks after bilateral cataract surgery with diffractive IOL implantation and 15 age- and gender-matched control subjects. METHODS: Functional magnetic resonance imaging (fMRI) was performed when participants viewed low-contrast grating stimuli...
April 19, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28407161/preliminary-evidence-of-successful-near-vision-enhancement-with-a-new-technique-presbyopic-allogenic-refractive-lenticule-pearl-corneal-inlay-using-a-smile-lenticule
#2
Soosan Jacob, Dhivya Ashok Kumar, Amar Agarwal, Athiya Agarwal, Ramalingam Aravind, A I Saijimol
PURPOSE: To describe a new technique (PrEsbyopic Allogenic Refractive Lenticule [PEARL] inlay) using an allogenic corneal inlay prepared from a small incision lenticule extraction (SMILE) lenticule. METHODS: A SMILE lenticule of specified thickness (mean: 61.5 ± 3.32 µm) was trephined at the center to 1-mm diameter and implanted in the cornea on the coaxially sighted light reflex under a femtosecond laser-created cap of 120 µm in the nondominant eye of presbyopic patients...
April 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28366376/negative-dysphotopsia-causes-and-rationale-for-prevention-and-treatment
#3
Jack T Holladay, Michael J Simpson
PURPOSE: To determine the cause of negative dysphotopsia using standard ray-tracing techniques and identify the primary and secondary causative factors. SETTING: Department of Ophthalmology, Baylor College of Medicine, Houston, Texas, USA. DESIGN: Experimental study. METHODS: Zemax ray-tracing software was used to evaluate pseudophakic and phakic eye models to show the location of retinal field images from various visual field objects...
February 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28007099/in-the-bag-nasal-intraocular-lens-optic-truncation-for-treatment-of-negative-dysphotopsia
#4
Neeti Meghnad Alapati, George J Harocopos, Arsham Sheybani
We describe in-the-bag nasal intraocular lens (IOL) optic truncation, a new technique for the treatment of negative dysphotopsia. After a plane is created between the nasal capsular bag and the IOL, micrograspers and intraocular scissors are used to amputate the nasal optic edge. The amputation is to reduce the optical impact of the IOL edge and nasal anterior capsule on the occurrence of negative dysphotopsia. The technique addresses many of the proposed mechanisms contributing to the development of negative dysphotopsia and can theoretically be used in all patients with chronic symptomatology...
December 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27956290/objective-evaluation-of-negative-dysphotopsia-with-goldmann-kinetic%C3%A2-perimetry
#5
Natalia Y Makhotkina, Tos T J M Berendschot, Rudy M M A Nuijts
PURPOSE: To compare the extension of peripheral visual fields in phakic and pseudophakic patients and to evaluate whether Goldmann kinetic perimetry can be used as an objective measure of negative dysphotopsia. SETTING: University Eye Clinic, Maastricht University Medical Centre, Maastricht, the Netherlands. DESIGN: Prospective and case-control study. METHODS: Kinetic perimetry was performed with V4e and I4e stimuli...
November 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27830188/introduction-of-a-toric-intraocular-lens-to-a-non-refractive-cataract-practice-challenges-and-outcomes
#6
Clare Kirwan, John M Nolan, Jim Stack, Ian Dooley, Johnny Moore, Tara Cb Moore, Stephen Beatty
AIM: To identify challenges inherent in introducing a toric intraocular lens (IOL) to a non-refractive cataract practice, and evaluate residual astigmatism achieved and its impact on patient satisfaction. METHODS: Following introduction of a toric IOL to a cataract practice with all procedures undertaken by a single, non-refractive, surgeon (SB), pre-operative, intra-operative and post-operative data was analysed. Attenuation of anticipated post-operative astigmatism was examined, and subjectively perceived visual functioning was assessed using validated questionnaires...
May 25, 2016: International Journal of Ophthalmology and Clinical Research
https://www.readbyqxmd.com/read/27678470/ring-shaped-dysphotopsia-associated-with-posterior-chamber-phakic-implantable-collamer-lenses-with-a-central-hole
#7
Youngsub Eom, Dae Wook Kim, Dongok Ryu, Jun-Heon Kim, Seul Ki Yang, Jong Suk Song, Sug-Whan Kim, Hyo Myung Kim
PURPOSE: To evaluate the incidence of central hole-induced ring-shaped dysphotopsia after posterior chamber phakic implantable collamer lens (ICL) with central hole (hole ICL) implantation and to investigate the causes of central hole-induced dysphotopsia. METHODS: The clinical study enrolled 29 eyes of 15 consecutive myopic patients implanted with hole ICL. The incidence of ring-shaped dysphotopsia after hole ICL implantation was evaluated. In the experimental simulation study, non-sequential ray tracing was used to construct myopic human eye models with hole ICL and ICL without a central hole (conventional ICL)...
September 28, 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27341093/-the-effect-of-multifocal-toric-lens-rotation-on-visual-quality
#8
M Veselá, D Baráková, D Bujalková, D Garajová
PURPOSE: The aim of the study was evaluation and comparison of rotational stability and the effect of multifocal toric intraocular lens rotation (T-MIOL) at visual quality of two types of intraocular lens AcrySof IQ ReSTOR Toric SND1Tx (Alcon Laboratories, Inc.) and AT LISA toric 909M (Carl Zeiss Meditec AG). There was evaluated a pseudophakic dysphotopsia based on patients subjective feelings as well as the independence on glasses and overall satisfaction with the visual quality after T-MIOLs were implanted...
2016: Ceská a Slovenská Oftalmologie
https://www.readbyqxmd.com/read/27304603/stability-of-a-novel-intraocular-lens-design-comparison-of-two-trifocal-lenses
#9
Francisco Poyales, Nuria Garzón, Jos J Rozema, Concepción Romero, Begoña Ortíz de Zárate
PURPOSE: To compare visual outcomes, rotational stability, and centration in a randomized controlled trial in patients undergoing cataract surgery who were bilaterally implanted with two different trifocal intraocular lenses (IOLs) with a similar optical zone but different haptic shape. METHODS: Twenty-one patients (42 eyes) with cataract and less than 1.50 D of corneal astigmatism underwent implantation of one FineVision/MicoF IOL in one eye and one POD FineVision IOL in the contralateral eye (PhysIOL, Liège, Belgium) at IOA Madrid Innova Ocular, Madrid, Spain...
June 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27257726/current-theories-and-methods-for-managing-negative-dysphotopsia
#10
Garett S Frank, Preeya K Gupta
No abstract text is available yet for this article.
2016: International Ophthalmology Clinics
https://www.readbyqxmd.com/read/27035075/an-update-on-new-low-add-multifocal-intraocular-lenses
#11
REVIEW
Mario J Rojas, Elizabeth Yeu
PURPOSE OF REVIEW: The purpose of this article is to provide an overview and update on recent literature regarding low-add multifocal intraocular lenses (MFIOLs). RECENT FINDINGS: Clinical and benchwork studies involving low-add MFIOLs were reviewed. Clinical studies focused on uncorrected distance, intermediate, and near vision, along with secondary dysphotopsias. Studies done in the laboratory assessed the optical properties of various lenses, and optically replicated visual scenarios at different viewing distances...
July 2016: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/26796456/extending-the-range-of-vision-using-diffractive-intraocular-lens-technology
#12
Henk A Weeber, Sieger T Meijer, Patricia A Piers
PURPOSE: To describe and to experimentally assess a new intraocular lens (IOL) design using new diffractive technology. SETTING: AMO Groningen b.v., Groningen, Netherlands. DESIGN: Experimental study. MATERIALS AND METHODS: The basic principles of the new diffractive technology are described. The new IOL comprises two diffractive technologies; one is designed to extend the range of vision by elongating the focus, and the other increases the retinal image contrast by correcting chromatic aberration...
December 2015: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/26429472/a-novel-full-angle-scanning-light-scattering-profiler-to-quantitatively-evaluate-forward-and-backward-light-scattering-from-intraocular-lenses
#13
Bennett N Walker, Robert H James, Don Calogero, Ilko K Ilev
Glare, glistenings, optical defects, dysphotopsia, and poor image quality are a few of the known deficiencies of intraocular lenses (IOLs). All of these optical phenomena are related to light scatter. However, the specific direction that light scatters makes a critical difference between debilitating glare and a slightly noticeable decrease in image quality. Consequently, quantifying the magnitude and direction of scattered light is essential to appropriately evaluate the safety and efficacy of IOLs. In this study, we introduce a full-angle scanning light scattering profiler (SLSP) as a novel approach capable of quantitatively evaluating the light scattering from IOLs with a nearly 360° view...
September 2015: Review of Scientific Instruments
https://www.readbyqxmd.com/read/26367435/vignetting-and-negative-dysphotopsia-with-intraocular-lenses-in-far-peripheral-vision
#14
Michael J Simpson
At very large visual angles, vignetting can occur at the edge of an intraocular lens (IOL), because it is much smaller than the natural crystalline lens that it replaces. Ray trace calculations show that, by 80-90 deg of input visual angle, it is possible that about half the light is no longer focused by the IOL. This may create curved, peripheral, shadowlike regions, which are a clinical characteristic of negative dysphotopsia. The imaging characteristics for this "far peripheral vision" region are different from those of a phakic eye, whether or not negative dysphotopsia is experienced...
September 1, 2015: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/26327909/sutureless-glueless-scleral-fixation-of-single-piece-and-toric-intraocular-lens-a-novel-technique
#15
Aditya Kelkar, Rachana Shah, Jai Kelkar, Shreekant Kelkar, Ekta Arora
Sutureless, glueless, scleral fixation of an intraocular lens is a known technique of fixing a lens in the scleral pockets. However, this technique is applied to single-piece and toric lenses instead of 3-piece lenses, allowing the advantage of the use of premium lenses in patients with poor capsular support. Favourable results without complications of pigment dispersion, iris transillumination defects, dysphotopsia, elevated intraocular pressure, intraocular hemorrhage and cystoid macular edema with a well-centered, stable intraocular lens have been observed in the 3-month postoperative period in both cases...
May 2015: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/26229427/refractive-index-and-its-impact-on-pseudophakic-dysphotopsia
#16
Bryce R Radmall, Anne Floyd, Zack Oakey, Randall J Olson
PURPOSE: It has been shown that the biggest dissatisfier for uncomplicated cataract surgery patients is pseudophakic dysphotopsia (PD). While edge design of an intraocular lens (IOL) impacts this problem, refractive index is still controversial as to its impact. This retrospective cohort study was designed to determine the role of increasing refractive index in PD. PATIENTS AND METHODS: This study was conducted at the John A. Moran Eye Center, University of Utah, USA...
2015: Clinical Ophthalmology
https://www.readbyqxmd.com/read/25985431/the-intersection-of-optics-and-neuro-ophthalmology-the-enigma-of-pseudophakic-dysphotopsia
#17
EDITORIAL
Marc A Michelson, Jack T Holladay
No abstract text is available yet for this article.
June 2015: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/25968132/determinants-of-patient-satisfaction-and-function-related-to-vision-following-cataract-surgery-in-eyes-with-no-visually-consequential-ocular-co-morbidity
#18
Clare Kirwan, John M Nolan, Jim Stack, Tara C B Moore, Stephen Beatty
PURPOSE: To investigate subjectively reported outcomes following cataract surgery and the relationships between such outcomes in the context of falling thresholds for cataract surgery. SETTING: Large, private, non-refractive cataract practice, Institute of Eye Surgery, Whitfield Clinic, Waterford, Ireland METHODS: Pre-operative, intra-operative and post-operative data of 2552 eyes undergoing phacoemulsification and implantation of the Tecnis(R) ZCB00 1-piece intraocular lens (IOL) by a single surgeon between July 2009 and October 2013 was analysed...
October 2015: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/25947640/treatment-of-negative-dysphotopsia-with-supplementary-implantation-of-a-sulcus-fixated-intraocular-lens
#19
Natalia Y Makhotkina, Tos T J M Berendschot, Henny J M Beckers, Rudy M M A Nuijts
PURPOSE: Our aim was to evaluate the resolution of negative dysphotopsia after supplementary implantation of a sulcus-fixated intraocular lens (IOL). METHODS: This was a retrospective case series. Patients with severe negative dysphotopsia were treated with supplementary implantation of the Rayner Sulcoflex Aspheric (653 L) IOL. Primary outcome measurements were subjectively reported complaints of dysphotopsia, best corrected distance visual acuity (CDVA), iris-IOL distance, anterior chamber depth (ACD) and volume (ACV), angle opening distance and trabecular-iris space area at 500 and 750 μm...
June 2015: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/25804577/pinhole-iris-fixated-intraocular-lens-for-dysphotopsia-and-photophobia
#20
Gonzalo Muñoz, Stephanie Rohrweck, Hani F Sakla, Wassim Altroudi
UNLABELLED: We present the pinhole iris-fixated diaphragm intraocular lens (IOL), which is a 1-piece black polycarbonate IOL with rigid iris-fixated haptics, an 8.5 mm overall length, a 6.0 mm diameter optic, and a central opening, the pinhole. The IOL was implanted in a 36-year-old man who had a history of debilitating dysphotopsia (star burst, halos, glare, and ghosting) and severe light sensitivity in his right eye following several interventions for keratoconus. The diameter of the central opening of the pinhole IOL, 2...
March 2015: Journal of Cataract and Refractive Surgery
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