scholarly journals Correlation Between Myopic Refractive Error, Corneal Power and Central Corneal Thickness in the Egyptian Population

2021 ◽  
Vol Volume 15 ◽  
pp. 1557-1566
Author(s):  
Mohamed Kotb ◽  
Sherif A Eissa
Keyword(s):  
Refractive Error ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Corneal Power ◽  
Egyptian Population

scholarly journals Reference values of the central corneal thickness with different refractive errors for the adult Egyptian population

2020 ◽  
Author(s):  
Amr A. Gab-Alla
Keyword(s):  
Reference Values ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Cross Sectional Study ◽  
Refractive Errors ◽  
Spherical Equivalent ◽  
Sectional Study ◽  
Cross Sectional ◽  
Egyptian Population ◽  
The Mean

Abstract Background: To generate reference values of the central corneal thickness (CCT) with different refractive errors for the adult Egyptian population. Methods: A retrospective, observational, and cross-sectional study of 2200 eyes in 1166 subjects scheduled for LASIK, who came to private refractive eye center, Ismailia, Egypt. The study period was from January 2018 to January 2020. The subjects were divided into a broad range of myopia with spherical equivalent (SE) <-0.5D and hyperopia SE> +0.5D. Then, the myopic eyes divided into low (SE>-3.0D), moderate (SE-3.0D to >-6.0D), and high (SE<-6.0D). Similarly, the hyperopic eyes were divided into low (SE<+3.0 D) and moderate (SE+3.0D to <+6.0D) and high >+6.0D. The refractive error was measured by an auto-refractometer (Topcon, Tokyo Optical Co., Ltd., Japan), and CCT was measured using Sirius (CSO, Florence, Italy). Results: The data of 1100 myopic eyes in 556 subjects (30.5% males and 69.5% females) and 1100 hyperopic eyes in 610 subjects (33.6% males and 66.4% females). The mean+SD of CCT for the total myopic subjects was 531.98+32.92μm, range (406 to 636μm). The mean+SD of SE was -4.1±2.5D, range (-0.5 to -12.0D). The mean+SD of CCT for the total hyperopic subjects was 529±38.8μm, range (448 to 619 μm). The mean+SD of SE was +3.65+1.97D, range (+0.5 to +8.5D).Conclusion: In this study, the mean of CCT of the Egyptian population was 531.9 μm for myopic and 529μm for hyperopic subjects respectively. The myopic and hyperopic subjects show a reduction in CCT with age. Females have a thinner cornea than males, 23.6% of the myopic eyes, and 16.5% of the hyperopic eyes have CCT less than 500μm.

scholarly journals Changes in Corneal Endothelial Cells Morphology Due to Different Cataract Surgery Procedures: A Retrospective Study From November 2014 to November 2016

2020 ◽  
Vol 17 (2) ◽  
Author(s):  
Ma Bariah ◽  
Leong SY
Keyword(s):  
Endothelial Cells ◽  
Cataract Surgery ◽  
Refractive Error ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Dissipated Energy ◽  
Corneal Endothelial Cells ◽  
Significant Difference ◽  
Duration Of Surgery ◽  
Snellen Chart

Introduction: The corneal endothelium is made up of an extremely thin layer of non -regenerating cells essential in keeping the cornea clear. The purpose of this study was to quantify the corneal endothelial cells morphology, visual acuity (VA) and refractive error in patients having femtosecond laser-assisted cataract surgery (FLACS) and conventional phacoemulsification surgery (CPS). Methods: Clinical data from 56 eyes were included in this study. 28 eyes had FLACS surgery and another 28 eyes had CPS. Distance VA, refractive error, corneal thickness and endothelial cells morphology were evaluated pre-operatively and at 1 month follow up. Refractive error was determined subjectively and VA was taken using Snellen chart. Specular microscope was used to measure endothelial cells morphology and central corneal thickness. Mann Whitney test and Spearman correlation analysis were used to analyse the results. Results: There were no statistically significant difference in the mean endothelial cell density (p=0.24), mean central corneal thickness (p=0.68), mean coefficient of variance (p=0.19), mean hexagonality (p=0.44), VA (p=0.72) and postoperative refractive outcome (p=0.66) between both groups. The duration of surgery was noted to have no statistically significant difference between both groups (p=0.08), while the cumulative dissipated energy and torsional time showed a significant difference between groups (p=0.01 and p<0.01 respectively). Conclusion: This study concluded that there was no significant difference in the endothelial cells morphology in patients undergoing both cataract surgeries. Both surgeries presented similar outcomes in the patients’ eyes.

scholarly journals Stabilization of refractive error and associated factors following small incision phacoemulsification cataract surgery

2022 ◽  
Vol 22 (1) ◽  
Author(s):  
Ammar M Khan ◽  
Derek M. Waldner ◽  
Micah Luong ◽  
Emi Sanders ◽  
Andrew C. S. Crichton ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Cataract Surgery ◽  
Refractive Error ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Spherical Equivalent ◽  
Small Incision ◽  
Lens Position ◽  
Phacoemulsification Cataract Surgery

Abstract Background Accumulating evidence suggests that refractive stabilization occurs rapidly following small incision cataract surgery. Nonetheless, many guidelines still suggest waiting four to 6 weeks before prescribing corrective lenses. This study was undertaken to supplement the existing literature regarding refractive stabilization, and evaluate multiple contributing factors that could dissuade clinicians from confidently correcting refractive error in the early post-operative course following routine cataract surgeries. Methods Adult patients undergoing phacoemulsification cataract surgery with uncomplicated surgeries and post-surgical courses at the Calgary Ophthalmology Centre (Calgary, Alberta, Canada) were included in this prospective observational case series. Exclusion criteria included known corneal dystrophies, infectious keratitis, complicated surgery or toric/multifocal IOLs. Data was collected at weekly intervals for a total of 6 weeks. Collected data included autorefraction, visual acuity, corneal pachymetry, and effective lens position. Results One hundred six eyes of 104 patients were included in this study. Post-operative sphere, cylinder and spherical equivalent were not significantly different at any post-operative week compared with week six, and 80–86% of patients were within 0.5D of last follow-up spherical equivalent at any week. The secondary outcomes of central corneal thickness, effective lens position and visual acuity did, however, exhibit significant differences between early post-operative weeks and last follow-up values. Conclusions These data suggest that refractive error can be effectively measured and corrected as early as one-week post-operatively in the majority of patients, though other measures of post-operative stability including central corneal thickness, effective lens position and visual acuity can require up to 4 weeks to stabilize. Thus a conservative and pragmatic approach may be to wait until 4 weeks post-operatively prior to obtaining refractive correction following uncomplicated phacoemulsification cataract surgery.

Comparison of Refractive Error and Central Corneal Thickness in Neonates of Diabetic and Healthy Mothers

2015 ◽  
Vol 25 (5) ◽  
pp. 396-399
Author(s):  
Tuğba Göncü ◽  
Alpay Çakmak ◽  
Ali Akal ◽  
Sevim Çakmak
Keyword(s):  
Refractive Error ◽  
Central Corneal Thickness ◽  
Corneal Thickness
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