scholarly journals Correlation between contrast sensitivity and higher-order aberration based on pupil diameter after cataract surgery

2011 ◽  
pp. 1701 ◽  
Author(s):  
Takefumi Yamaguchi
Keyword(s):  
Cataract Surgery ◽  
Contrast Sensitivity ◽  
Pupil Diameter ◽  
Higher Order ◽  
Higher Order Aberration

Influence of Pupil Diameter on the Relation between Ocular Higher-Order Aberration and Contrast Sensitivity after Laser In Situ Keratomileusis

2006 ◽  
Vol 47 (4) ◽  
pp. 1334 ◽  
Author(s):  
Tetsuro Oshika ◽  
Tadatoshi Tokunaga ◽  
Tomokazu Samejima ◽  
Kazunori Miyata ◽  
Keisuke Kawana ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Pupil Diameter ◽  
Higher Order ◽  
Laser In Situ Keratomileusis ◽  
Higher Order Aberration

scholarly journals Comparison of Higher-Order Aberration and Contrast Sensitivity in Monofocal and Multifocal Intraocular Lenses

2007 ◽  
Vol 48 (4) ◽  
pp. 627 ◽  
Author(s):  
Chang Yeom Kim ◽  
So-Hyang Chung ◽  
Tae-im Kim ◽  
Young Jae Cho ◽  
Geunyoung Yoon ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Higher Order ◽  
Intraocular Lenses ◽  
Multifocal Intraocular Lenses ◽  
Higher Order Aberration

scholarly journals Improvements in Optical Characteristics after Excision of an Overhanging Bleb Developed following Trabeculectomy

2021 ◽  
Vol 2021 ◽  
pp. 1-5
Author(s):  
Yu Mizuno ◽  
Atsushi Hirota ◽  
Kazuyuki Hirooka ◽  
Yoshiaki Kiuchi
Keyword(s):  
Visual Acuity ◽  
Pupil Diameter ◽  
Higher Order ◽  
Higher Order Aberrations ◽  
Case Presentation ◽  
Conjunctival Flap ◽  
Corrected Visual Acuity ◽  
Before And After ◽  
Higher Order Aberration ◽  
Best Corrected Visual Acuity

Introduction. To examine the corneal total higher-order aberrations before and after the excision of an overhanging bleb that developed following trabeculectomy. Case Presentation. Two patients who developed overhanging blebs following trabeculectomy with a fornix-based conjunctival flap using mitomycin C (MMC) were assessed. We measured the corneal total higher-order aberrations for a 4 mm pupil diameter using the TOPCON KR-1W wavefront analyzer and the visual acuity before and after bleb excision. The corneal total higher-order aberration (HOA) improved from 0.50 μm to 0.38 μm in case 1 and from 0.59 μm to 0.49 μm in case 2 after bleb excision. The intraocular pressure was identical before and after bleb excision in both cases. No significant changes in the best-corrected visual acuity (BCVA) were noted in case 1; however, BCVA was improved from 20/25 to 20/20 in case 2. Both cases showed improvements in the symptoms of dysesthesia. Conclusion. Excision of the overhanging bleb developed following trabeculectomy may have beneficial possibility in some cases where corneal total HOA is affected and reduces the symptoms of dysesthesia.

Usefulness of Itrace in Diagnosing Unclear Cases of the Deterioration in Visual Acuity. Congenital Lens Dysfunction as a New Disease Entity. Preliminary Reports.

2020 ◽  
Keyword(s):  
Visual Acuity ◽  
Visual Impairment ◽  
Contrast Sensitivity ◽  
Higher Order ◽  
New Disease ◽  
Disease Entity ◽  
Apparent Lack ◽  
Visual Contrast ◽  
Visual Contrast Sensitivity ◽  
Higher Order Aberration

The article analyses 22 cases of severe impairment of vision to far distances for no apparent reason. Visual impairment was observed regardless of patients’ age and type of eye defect diagnosed, with the majority of people suffering from myopia and accompanying astigmatism. The exclusion of causes related to the cornea and retina, optic nerve damage and the lack of visible pathologies of the lens in the physical examination did not allow for the determination of the cause of deterioration in visual acuity to far distances despite good vision to near distances. The results of examinations using iTrace indicated the lens as the cause of visual impairment despite the apparent lack of opacity and other pathologies within it. The results of examinations in the field of Higher Order Aberration, Opacity Map, Modulation Transfer Function™ and their graphical presentation using the Dysfunctional Lens Index™ module were analysed. Low values of visual contrast sensitivity and high values of higher order aberrations for the internal optics were observed, with the correct values for the cornea. The more pathological the results of the visual contrast sensitivity and higher order aberration, the lower the values of visual acuity to far distances. In most cases removing the dysfunctional lens and replacing it with an artificial lens allowed for a significant improvement in vision to far distances while maintaining proper vision to near distances. The procedure was performed on patients over 18 years of age. The medical history in the study group may indicate a congenital nature of the abnormal structure of the lens. Thus, it is necessary to consider verification of the diagnosis made in some patients, pointing to a new disease entity, i.e. congenital lens dysfunction.

Pediatric Cataract Surgery: Comparison between Ages at Surgery and Contrast Sensitivity Outcomes

2019 ◽  
Vol 43 (1) ◽  
pp. 50
Author(s):  
Aquirina Caesari Putri ◽  
Rozalina Loebis
Keyword(s):  
Visual Acuity ◽  
Cataract Surgery ◽  
Contrast Sensitivity ◽  
Cataract Extraction ◽  
Significant Negative Correlation ◽  
Natural World ◽  
P Value ◽  
Pediatric Cataract ◽  
Low Contrast ◽  
Significant Difference

Background: Pediatric cataracts are major causes of children’s blindness. Surgery has proven to be beneficial in terms of visual function prognosis. Contrast sensitivity evaluation after surgery is as important as visual acuity considering that natural world consists of various objects in low-to-medium contrasts. The purpose of this study is to analyze the difference of contrast sensitivity outcomes based on ages at surgery. Method: Retrospective data of children with pediatric developmental cataract from July 2013 to November 2015 were collected. All children who underwent cataract surgery at 60-months-old or less were randomized into two groups, ≤24 months and >24-to-60 months. Contrast sensitivity was then examined with preferential-looking method using Hiding Heidi low-contrast test face chart. The main outcome measures were contrast sensitivity of both groups. Age-at-evaluation, cataract onset, duration of follow-up, duration of deprivation and visual acuity were also noted. Result: Of 14 children (23 eyes), 11 eyes (47,8%) were in ≤24 months group, 12eyes (52,2%) were in >24-to-60 months group. All eyes underwent cataract extraction and similar type of intraocular lens implantation. Mean age-at-surgery was 28,2 months±16,8 (SD). Mean contrast sensitivity for each group was 47,50 %±42,29 and 18,33%±27,38, respectively, with p-value 0,031. Further analysis of Spearman’s correlation test demonstrated significant negative correlation (rs = -0,559; p = 0,006) between the two groups. Conclusion: There was statistically significant difference in contrast sensitivity between those who underwent surgery at ≤24 months and >24-to-60 months. Children who underwent surgery at older ages tend to have better contrast sensitivity afterwards.

Changes in pupillometry associated with dissipated energy during phacoemulsification

2020 ◽  
pp. 112067212098437
Author(s):  
Giulia Coco ◽  
Pierluca Cremonesi ◽  
Nardine Menassa ◽  
Luca Pagano ◽  
Kunal A Gadhvi ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Generalized Linear Model ◽  
Pupil Diameter ◽  
University Hospital ◽  
Dissipated Energy ◽  
Dynamic Measurements ◽  
Operative Complications ◽  
Cumulative Dissipated Energy ◽  
Chamber Measurements ◽  
Phacoemulsification Cataract Surgery

Purpose: To investigate the effect of ultrasound level during phacoemulsification on pupil dynamics. Methods: Comparative retrospective study on patients who underwent routine cataract surgery at the Royal Liverpool University Hospital. Clinical parameters, anterior chamber measurements, axial length, surgeon grade, time of surgery, level of ultrasound used (cumulative dissipated energy, CDE), intra- and post-operative complications were collected. Pupil diameters were collected before and 4 ± 1 weeks after surgery in static scotopic, mesopic, photopic pupil conditions. Also, pupil dynamic measurements after luminous stimulus were recorded. Changes in static pupil diameters, relative dilation at 3.5 s after luminous stimulus, and time to reach 75% and 95% of maximum dilation were measured. Results: Forty-eight eyes of 24 patients (13 males) were included with a mean age of 73.1 ± 14.6 years. Mean CDE value was 18.11 ± 10.56. Mean scotopic pupil diameters decreased by 0.24 ± 0.48 mm ( p = 0.021) in the operated eye. Significant correlation was found between reduction in scotopic pupil diameter and CDE ( p = 0.05). A generalized linear model confirmed that the level of CDE was significantly associated with reduction in scotopic pupil diameter ( p = 0.026). Patients who underwent surgeries with lower CDE (0 < CDE ⩽ 10 and 10 < CDE ⩽ 20) did not experience significant changes in scotopic pupil diameter after surgery ( p = 0.28 and p = 0.79, respectively) as opposed to those with higher CDE (CDE > 20; p = 0.03). Conclusion: Phacoemulsification cataract surgery and the cumulative dissipated energy may be associated with changes in pupil behaviour.

scholarly journals Influence of pterygium size on corneal higher-order aberration evaluated using anterior-segment optical coherence tomography

2018 ◽  
Vol 18 (1) ◽  
Author(s):  
Keiichiro Minami ◽  
Tadatoshi Tokunaga ◽  
Keiichiro Okamoto ◽  
Kazunori Miyata ◽  
Tetsuro Oshika
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Segment ◽  
Higher Order ◽  
Optical Coherence ◽  
Higher Order Aberration

The impact of cataract surgery on depressive symptoms for bilateral cataract patients in Ho Chi Minh City, Vietnam

2013 ◽  
Vol 26 (2) ◽  
pp. 307-313 ◽  
Author(s):  
Kien Gia To ◽  
Lynn B. Meuleners ◽  
Michelle L. Fraser ◽  
Dat Van Duong ◽  
Dung Van Do ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Depressive Symptoms ◽  
Cataract Surgery ◽  
Contrast Sensitivity ◽  
Depression Scale ◽  
Epidemiological Studies ◽  
Ho Chi Minh City ◽  
Bilateral Cataract ◽  
Vietnamese Population ◽  
The Impact

ABSTRACTBackground:Depression is common among older populations with cataract. However, the impact of cataract surgery on depression in both developed and developing countries remains unclear. The aim of this study is to determine the impact of cataract surgery on depressive symptoms and to examine the association between objective visual measures and change in depressive symptoms after surgery among a Vietnamese population in Ho Chi Minh City.Methods:A cohort of older patients with bilateral cataract were assessed the week before and one to three months after first eye surgery only or first- and second-eye cataract surgeries. Visual measures including visual acuity, contrast sensitivity, and stereopsis were obtained. Depressive symptoms were assessed using the 20-item Center for Epidemiological Studies-Depression Scale (CES-D). Descriptive analyses and a generalized estimating equations (GEE) analysis were undertaken to determine the impact of cataract surgery on depressive symptoms.Results:Four hundred and thirteen participants were recruited into the study before cataract surgery. Two hundred and forty-seven completed the follow-up assessment after surgery. There was a significant decrease (improvement) of one point in the depressive symptoms score (p = 0.04) after cataract surgery, after accounting for potential confounding factors. In addition, females reported a significantly greater decrease (improvement) of two points in depressive symptom scores (p = 0.01), compared to males. However, contrast sensitivity, visual acuity, and stereopsis were not significantly associated with change in depressive symptoms scores. First-eye cataract surgery or both-eye cataract surgery did not modify the change in depressive symptoms score.Conclusion:There was a small but significant improvement in depressive symptoms score after cataract surgery for an older population in Vietnam.

Wavefront Analysis, Contrast Sensitivity, and Depth of Focus After Cataract Surgery With Aspherical Intraocular Lens Implantation

2010 ◽  
Vol 149 (3) ◽  
pp. 383-389.e2 ◽  
Author(s):  
Marcony R. Santhiago ◽  
Marcelo V. Netto ◽  
Jackson Barreto ◽  
Beatriz A.F. Gomes ◽  
Adriana Mukai ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Contrast Sensitivity ◽  
Intraocular Lens ◽  
Intraocular Lens Implantation ◽  
Depth Of Focus ◽  
Wavefront Analysis ◽  
Lens Implantation
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