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 ◽  
Refractive Errors ◽  
Egyptian Population

Abstract The authors have withdrawn this preprint due to author disagreement.

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 Effect of age, sex, and refractive errors on central corneal thickness measured by Oculus Pentacam®

2017 ◽  
Vol Volume 11 ◽  
pp. 1233-1238 ◽  
Author(s):  
Nauman Hashmani ◽  
Sharif Hashmani ◽  
Azfar Hanfi ◽  
Misbah Ayub ◽  
Choudhry Saad ◽  
...  
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Refractive Errors ◽  
Effect Of Age

scholarly journals A comparative study of central corneal thickness, mean keratometry and astigmatism in persons with and without refractive errors in Taif

2018 ◽  
Vol 5 (2) ◽  
pp. 416
Author(s):  
Afnan H. Alqurashi ◽  
Omayma K. Afifi ◽  
Hatim F. Jabr ◽  
Hanan A. Aljuaid
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Reference Value ◽  
Refractive Errors ◽  
Average Value ◽  
Significant Difference ◽  
Standard Normal ◽  
Km Value ◽  
Group A ◽  
The Mean

Background: Corneal topography is an important parameter in the evaluation of corneal disease, but there is no average value of normal corneal geometry in Saudi individuals is known. So, this study aimed to establish a standard normal value for central corneal thickness (CCT), mean keratometry (km), and astigmatism in Saudi individuals to be used as a reference value, and to compare these results with the same parameters in patients who have refractive errors. Methods: This study was performed from January 2016 to July 2017 at King Faisal Hospital in Taif, KSA, and included a current group of 105 eyes without refractive errors, and 250 eyes with refractor errors. Results: The mean CCT value was 551.681 µm, km value was 43.426 D, and astigmatism was 0.784 D for all eyes with normal visual acuity. However, these values are the statistically significant difference between different ages, but no significant differences according to sex. Regarding the eyes with refractive error, it was found that the mean CCT was 509.66 µm, km was 46.79 D, and for astigmatism was 3.97 D. When the results of two groups were compared, there was a significant difference between them except for km in the group a; (12-20 years). Conclusions: The standard value of central corneal thickness, mean keratometry, and astigmatism in Saudi individuals is differing according to the age but it is the same in both genders. These values are differing statistically in patients with refractor error. 

scholarly journals Correlation of Central Corneal Thickness with Refractive Errors and Corneal Curvature in the South Indian Population

2021 ◽  
Vol 4 (4) ◽  
pp. 31-38
Author(s):  
Nair Shobita ◽  
V Panneer Selvam ◽  
Shah Vinit J ◽  
Jayaraman Radha ◽  
V Vijayraghavan ◽  
...  
Keyword(s):  
Central Corneal Thickness ◽  
Indian Population ◽  
Corneal Thickness ◽  
South Indian Population ◽  
Refractive Errors ◽  
Corneal Curvature ◽  
The South ◽  
South Indian

scholarly journals Relationship between axial length, keratometry and central corneal thickness in patients with refractive errors at a teaching hospital in Southwest, Nigeria

2021 ◽  
Vol 8 (11) ◽  
pp. 1657
Author(s):  
Anthony O. Betiku ◽  
Adeola O. Onakoya ◽  
Olufisayo T. Aribaba ◽  
Omodele O. Jagun
Keyword(s):  
Teaching Hospital ◽  
Refractive Error ◽  
Axial Length ◽  
Refractive Surgery ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
University Teaching ◽  
Refractive Errors ◽  
Cross Sectional ◽  
The Mean

Background: Aim of the study was to determine the relationship between axial length (AL), keratometry and central corneal thickness (CCT), and refractive errors in adult patients attending the Guinness eye centre (GEC), Lagos university teaching hospital (LUTH) Idi-Araba, Lagos.Methods: A descriptive cross-sectional study conducted among consecutive patients aged 16 years and above with refractive errors attending the GEC, LUTH. Ocular parameters measured included AL, anterior corneal curvature, CCT and refractive errors. AL and keratometry were measured with IOL master and CCT with ultrasonic A scan pachymeter. Refraction was done with auto-refractor-keratometer. Data analysis was done with statistical package for social science (SPSS) 20. Results: A total of 394 patients were studied, 157 males and 237 females. The age range was 16-65 years, mean -37.9±13.3 years and median -36.5 years. There were more myopic patients 215 (54.6%) than hyper-metropes 179 (45.4%). The mean AL was 23.9±1.1 mm and eyes with longer AL were more likely to be myopic (r=-0.676, p<0.001); to have flatter cornea (r=0.519, p<0.001) and thicker cornea (r=0.149, p=0.003). The mean CCT was 520.3±31.0 µm. There was a weak negative correlation between CCT and refractive error (r=-0.111, p=0.027).Conclusions: The mean CCT was lower than the mean CCT of other Nigerian studies. Hypermetropic patients were more likely to have thinner corneas. This may lead to underestimation of intraocular pressure (IOP) in these patients. Significant correlation was seen between AL and refractive error, CCT and keratometry. AL correlated with less spherical equivalent refractive error, flatter and thicker cornea. It is therefore important to measure the CCT of all patients going for refractive surgery to detect those at risk of developing corneal ectasia following refractive surgery.

Endothelial Cell Density and Central Corneal Thickness following Penetrating Keratoplasty of Acanthamoeba Keratitis Patients – A Retrospective Cross-Sectional Observational Study

2021 ◽  
Author(s):  
Lei Shi ◽  
Fabian Norbert Fries ◽  
Kassandra Xanthopoulou ◽  
Tanja Stachon ◽  
Loay Daas ◽  
...  
Keyword(s):  
Endothelial Cell ◽  
Observational Study ◽  
Cell Density ◽  
Central Corneal Thickness ◽  
Penetrating Keratoplasty ◽  
Corneal Thickness ◽  
Acanthamoeba Keratitis ◽  
Endothelial Cell Density ◽  
Cross Sectional ◽  
Time Point

Abstract Purpose To analyze endothelial cell density (ECD) and central corneal thickness (CCT) following penetrating keratoplasty (PKP) in Acanthamoeba keratitis (AK) patients. Patients and Methods In this retrospective, clinical, single-center, cross-sectional, observational study, patients were enrolled who underwent PKP at the Department of Ophthalmology of Saarland University Medical Center, Homburg/Saar, Germany between May 2008 and December 2016 with the diagnosis of AK. In all, 33 eyes of 33 patients (14 males, 42%) were enrolled; their mean age at the time of surgery was 39.5 ± 14.3 years. Postoperatively, AK patients received topical polyhexamethylene biguanide, propamidine isethionate, neomycin sulphate/gramicidin/polymixin B sulfate, and prednisolone acetate eye drops (5 ×/day each), and the topical treatment was tapered sequentially with 1 drop every 6 weeks over 6 months. CCT was recorded using Pentacam HR Scheimpflug tomography and ECD with the EM-3000 specular microscope before surgery and 3 and 6 months after surgery as well as after the first and second (complete) suture removal. Results ECD tended to decrease significantly from the time point before surgery (2232 ± 296 cells/mm2) to the time point 3 months after surgery (1914 ± 164 cells/mm2; p = 0.080) and to the time point after the first suture removal (1886 ± 557 cells/mm2; p = 0.066) and decrease significantly to the time point after the second suture removal (1650 ± 446 cells/mm2; p = 0.028). CCT did not change significantly over the analyzed time period (p ≥ 0.475). Conclusion In AK, endothelial cell loss does not seem to be accelerated following PKP, despite the postoperative use of diamidine and biguanide. A subsequent prospective comparative study should confirm our retrospective longitudinal analysis.

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