The Experts below are selected from a list of 2487 Experts worldwide ranked by ideXlab platform
Robert E Fenzl - One of the best experts on this subject based on the ideXlab platform.
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minus power intraocular lenses to correct refractive errors in myopic Pseudophakia
Journal of Cataract and Refractive Surgery, 1999Co-Authors: James P Gills, Robert E FenzlAbstract:Abstract Purpose To evaluate the effectiveness of a secondary, piggyback, minus-power intraocular lens (IOL) to correct the refractive error in patients with myopic Pseudophakia. Methods In this prospective noncomparative cohort study, 51 myopic pseudophakic patients received implantation of a minus-power IOL as a secondary procedure to correct residual pseudophakic myopia. Results The mean residual myopia of −3.05 diopters (D) was reduced to –0.38 D. All eyes were within ±1.00 D of the desired refraction. Uncorrected visual acuity was 20/40 or better in 72% of eyes, and best corrected visual acuity was 20/40 or better in 96%. Uncorrected visual acuity improved by 2 or more lines in 85% of eyes and by 5 or more lines in 65%. Conclusion Clinical outcomes can now be improved in patients with myopic Pseudophakia whose previous options (i.e., lens exchange or refractive surgery) were more traumatic or less predictable.
H Helbig - One of the best experts on this subject based on the ideXlab platform.
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is Pseudophakia a risk factor for neovascular age related macular degeneration
Investigative Ophthalmology & Visual Science, 2007Co-Authors: Florian K P Sutter, Moreno Menghini, Daniel Barthelmes, J C Fleischhauer, M M Kurzlevin, Martina M Bosch, H HelbigAbstract:PURPOSE: To examine the possible association between Pseudophakia and neovascular age-related macular degeneration (AMD). METHODS: Reports of all patients undergoing fluorescein angiography in the authors' department over a 6-year period were retrospectively reviewed. Four hundred ninety-nine patients with recent onset of neovascular AMD in one eye and early age-related maculopathy (ARM) in the fellow eye were included in the study. Lens status (phakic or pseudophakic) in both eyes at the time of onset of neovascular AMD and the time between cataract surgeries (if performed) and onset of neovascular AMD were determined. RESULTS: There was no significant difference in lens status between eyes with neovascular AMD and fellow eyes with early ARM (115/499 [23.0%] vs. 112/499 [22.4%] pseudophakic; P = 0.88, odds ratio 1.035, 95% CI 0.770-1.391). Subgroup analysis revealed no difference between the groups with large drusen, small drusen, or pigmentary changes only (respectively, 20.3% vs. 19.6% pseudophakic, P = 0.92; 20.5% vs. 23.3% pseudophakic, P = 0.84; 33.3% vs. 31.7% pseudophakic, P = 1.0). Pseudophakic eyes with neovascular AMD had not been pseudophakic for a significantly longer period at the time of onset of neovascular AMD than their pseudophakic fellow eyes at the same time point (225.9 +/- 170.4 vs. 209.9 +/- 158.2 weeks, P = 0.27). CONCLUSIONS: The results do not support the hypothesis that Pseudophakia is a major risk factor for the development of neovascular AMD.
Elsa Fonseca - One of the best experts on this subject based on the ideXlab platform.
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Pupil Function in Pseudophakia: Proximal Miosis Behavior and Optical Influence
Photonics, 2019Co-Authors: Elsa Fonseca, Paulo Torrao Fiadeiro, Renato Gomes, Angel Sanchez Trancon, Antonio M G Baptista, Pedro M. SerraAbstract:The pseudophakic eye lacks the ability to produce a refractive change in response to object proximity. Thus, individual anatomical features such as the pupil size play an important role in achieving functional vision levels. In this work, the range of pupil sizes at varying object distance was measured in pseudophakic participants. Furthermore, the impact of the measured values on eye optical quality was investigated using a computer simulation model. A binocular eye-tracker was used to measure the participants’ pupil sizes at six object distances, ranging from 0.33 m (i.e., vergence of 3.00 D) to 3.00 m (i.e., vergence of 0.33 D), while observing a Maltese cross with a constant angular size of 1 ∘ . In total, 58 pseudophakic participants were enrolled in this study (age mean ± standard deviation: 70.5 ± 11.3 years). The effects of object distance and age on pupil size variation were investigated using linear mixed effects regression models. Age was found to have a small contribution to individual variability. The mean infinite distance pupil size (intercept) was 4.45 ( 95 % CI: 2.74, 6.17) mm and the mean proximal miosis (slope) was − 0.23 ( 95 % CI: −0.53, 0.08) mm/D. The visual acuity (VA) estimation for a distant object ranged from − 0.1 logMAR (smallest pupil) to 0.04 logMAR (largest pupil) and the near VA ( 0.33 m) when mean proximal miosis was considered ranged from 0.28 logMAR (smallest pupil) to 0.42 logMAR (largest pupil). When mean distance pupil was considered, proximal miosis individual variability produced a variation of 0.04 logMAR for the near object and negligible variation for the distant object. These results support the importance of distance pupil size measurement for the prediction of visual performance in Pseudophakia, while suggesting that proximal miosis has a negligible impact in VA variability.
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influence of pupil function in Pseudophakia
Fourth International Conference on Applications of Optics and Photonics, 2019Co-Authors: Elsa Fonseca, Paulo Torrao Fiadeiro, Renato Gomes, Angel Sanchez Trancon, Antonio M G Baptista, Pedro SerraAbstract:In Pseudophakia, the eye is unable accommodate so proximal objects can be properly focused. Achieving functional vision levels relies on individual anatomical features, notably, the pupil size. This study measured the range of pupil sizes found in a population of pseudophakes, for an object placed at different distances, and modeled the optical quality associated to pupil variation. The pupil size of 58 pseudophakic eyes (age mean ± standard deviation: 70.5 ± 11.3 years) was measured using a binocular eye-tracker. The participants observed on a monitor a circular white patch subtending 5° with a cross on its center. The object was placed at 3.0, 1.0, 0.66, 0.5, 0.4, 0.33 m. The pupil size variation as a function of object distance was modelled using a linear mixed effects model. The mean and 95% confidence interval (CI) were calculated for a far object and the slope of the function, indicative of the proximal myosis. The effect of object distance on the image quality was modeled using a pseudophakic model eye for the pupil size data. The mean distance pupil sizes were 4.45 (95%CI: 2.74, 6.17) mm and the mean proximal myosis was -0.23 (95%CI: -0.53, -0.08) mm/D. The VA estimation for a distance object ranged from -0.1 logMAR for the smallest pupil to 0.08 logMAR and the near VA when mean myosis was considered ranged from 0.28 logMAR to 0.65 logMAR. These results support the importance of distance pupil size measurement for the prediction of visual performance in Pseudophakia, while suggesting that myosis has a negligible impact in VA variability.
Catherine P. Creuzot-garcher - One of the best experts on this subject based on the ideXlab platform.
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The learning curve for primary vitrectomy without scleral buckling for pseudophakic retinal detachment
Graefe's Archive for Clinical and Experimental Ophthalmology, 2008Co-Authors: Brice Dugas, Pierre-olivier Lafontaine, Alexandre Guillaubey, Jean-paul Berrod, Isabelle Hubert, Alain M. Bron, Catherine P. Creuzot-garcherAbstract:Background To assess the functional and anatomical outcome of primary vitrectomy without scleral buckling for rhegmatogenous retinal detachment (RRD) in pseudophakic patients and to present the learning curve for this surgery in less experienced surgeons. Methods We reviewed the charts of pseudophakic patients treated with primary vitrectomy without scleral buckling for a rhegmatogenous retinal detachment with PVR
Lingam Vijaya - One of the best experts on this subject based on the ideXlab platform.
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Glaucoma in aphakia and Pseudophakia in the Chennai Glaucoma Study.
The British journal of ophthalmology, 2005Co-Authors: H. Arvind, Ronnie George, Prema Raju, S. V. Ramesh, Mani Baskaran, Pradeep G. Paul, Catherine A. Mccarty, Lingam VijayaAbstract:Aim: To determine the prevalence of glaucoma among aphakes and pseudophakes in a rural population of southern India. Methods: 3924 subjects aged 40 years or above underwent complete ophthalmic examination. Glaucoma in aphakia/Pseudophakia was diagnosed using International Society of Geographical and Epidemiological Ophthalmology criteria in aphakic/pseudophakic people. Results: 54 subjects (37 aphakes, 17 pseudophakes) (1.38% of 3924 subjects, 11.2% of 482 aphakes/pseudophakes) had glaucoma in aphakia/Pseudophakia. Aphakia, age, intraocular pressure (IOP), pseudoexfoliation, and peripheral anterior synechiae greater than or equal to 180 degrees of the angle were risk factors for glaucoma on univariate analysis. On multivariate analysis, IOP and aphakia were independent risk factors for glaucoma. 39 people (72.22%) with glaucoma had normal IOP at presentation. None of the people with glaucoma were aware of the disease. Blindness in one or both eyes was seen in 12 subjects (10 unilateral and two bilateral)—that is, 22.22% of people with glaucoma in aphakia/Pseudophakia. Conclusions: Glaucoma is an important cause of ocular morbidity among aphakes and pseudophakes in this rural population of south India. This glaucoma, responsible for unilateral or bilateral blindness in 22.2% of those affected, was entirely undetected in this study population.
