scholarly journals Difference in Central Corneal Thickness between Applanation Ultrasound and Oculus Wave � 152 Light Occulyzer II

2019 ◽  
Vol 35 (3) ◽  
Author(s):  
Munira Shakir, Ronak Afza Memon Sahira Wasim Shakir Zafar
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Clinical Settings ◽  
Exclusion Criteria ◽  
Cross Sectional ◽  
Ultrasound Pachymetry ◽  
Department Of Ophthalmology ◽  
The Mean ◽  
Thickness Measurements ◽  
Applanation Ultrasound

Purpose: To determine the mean difference of central corneal thickness measurements by using ultrasound Pachymetry and oculus Wave light Occulyzer II. Study Design: Cross-sectional comparative study using non-probability consecutive sampling. Place and Duration of Study: This study was conducted at Department of Ophthalmology, Liaquat National Hospital Karachi from November 2018 to June 2019. Material & Methods: After approval from ethical committee, patients were included in our study on the basis of inclusion & exclusion criteria. Central corneal thickness measurements were taken by using ultrasound Pachymetry & oculus Wave light Occulyzer II. All the data was collected by single researcher. The results were plotted, compared & analyzed. Paired t-test was used for the comparison of quantitative variables. Results: There were 130 patients included in the study out of which 73 (56.2%) were males and 57 (43.8%) were females. Mean age of these patients was 33.9 � 8.9 years. The mean � SD thinnest oculus Wave light Occulyzer II measurement was 538.61 � 23.46 ?m and ranged between 476.0 and 619.0 ?m whereas the mean thinnest ultrasound Pachymetry measurement was 535.1 � 21.816 ?m and ranged between 482 and 601 ?m. There was highly significant correlation of central corneal thickness between both the instruments. (r = 0.96, p < 0.001). Conclusion: There is a high correlation of central corneal thickness between the readings obtained from ultrasound and optical pachymetry machines therefore oculus Wave light Occulyzer II can be used as an alternative technique to ultrasound pachymetry while assessing CCT in clinical settings. Key Words: Central corneal thickness, Ultrasound Pachymetry, Optical Pachymetry.

scholarly journals Determining the mean difference in central corneal thickness measured by applanation ultrasound and oculus Wavelight Occulyzer II

2021 ◽  
Vol 35 (3) ◽  
Author(s):  
Dr Ronak afza Memon ◽  
Dr munira Shakir ◽  
Dr Sahira Wasim
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Mean Difference ◽  
Topical Anesthetic ◽  
Cross Sectional ◽  
Anesthetic Agents ◽  
Department Of Ophthalmology ◽  
The Mean ◽  
Thickness Measurements ◽  
Ultrasound Pachymeter

Abstract Objective: The objective is to determine the mean difference of central corneal thickness measurements by using ultrasound pachymeter and oculus Wavelight Occulyzer II. Patients & Methods: This prospective cross-sectional comparative study was conducted at Department of Ophthalmology, Liaquat National Hospital, Karachi for 6 months duration, after the approval from ethical committee. Patients were included in our study on the basis of inclusion & exclusion criteria. Central corneal thickness measurements was taken by using ultrasound pachymeter & oculus Wavelight Occulyzer II. All the data was collected by single researcher. The results were plotted, compared & analyzed. Results: 130 patients attending ophthalmology department and fulfilling the inclusion criteria were assessed. One eye of each patient was measured (65 were right eye and 65 were left eye). 73(56.2%) were male and 57(43.8%) were females. Mean age of these patients was 33.9 ±8.9 years. The mean ± SD thinnest oculus Wavelight Occulyzer II measurement was 538.61±23.46 ?m and ranged between 476.0 and 619.0 ?m whereas the mean thinnest ultrasound pachymeter measurement was 535.1±21.816?m and ranged between 482 and 601 ?m. There was highly significant correlation of central corneal thickness between both the instruments. (r=0.96, p<0.001)  Conclusion: According to the results of our study there is a highly correlation of central corneal thickness was found between the readings obtained from both UP and oculus Wavelight Occulyzer II. So we concluded that oculus Wavelight Occulyzer II can be used as an alternative technique to ultrasound pachymetry while assessing CCT in clinical settings to  decrease the risk of procedure associated problems with UP like epithelial trauma and infection, to decrease the frequent use of topical anesthetic agents, for early detection and management of glaucoma & in anxious patients also. Keywords: Central corneal thickness, ultrasound pachymeter, oculus Wavelight Occulyzer II  

scholarly journals CENTRAL CORNEAL THICKNESS

2018 ◽  
Vol 25 (02) ◽  
pp. 252-260
Author(s):  
Muhammad Ijaz Ahmad ◽  
Manzoor Ahmad Qureshi ◽  
Muhammad Shakeel Ahmad ◽  
Yousef Homood Aldebasi
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Mean Value ◽  
T Test ◽  
Kingdom Of Saudi Arabia ◽  
Cross Sectional ◽  
Ultrasound Pachymetry ◽  
Significant Difference ◽  
The Mean ◽  
Ultrasonic Pachymetry

Objectives: To compare central corneal thickness in myopic and keratoconuseyes by ultrasound pachymetry and pentacam HR. Study Design: Cross sectional study.Setting: Qassim University, Optometry Clinics, Kingdom of Saudi Arabia. Period: October2016 to April 2017. Methodology: One hundred myopic and keratoconus participants. CentralCorneal Thickness (CCT) were measured with two techniques by ultrasonic pachymetry andpentacam HR in two groups. Group one consisted of 80 myopic participants and group two of 20Keratoconuspatients.Pentacamreadings were recorded first. CCT were compared and analyzedstatistically using unpaired t-test and histogram. Results: One hundred participants (100) wereincluded in which 80 participants were myopic and 20 with keratoconus. Both eyes (200) of allthe participants were examined. Age of the myopics ranged from 18-30 years (Mean=23.03).The mean value with ultrasound pachymetery was 555μm (SD±32.021) and with pentacam566μm (SD±37.367). We observed a tendency of overestimation of CCT measurements withpentacam. Statistically a significant difference of reading between two devices (P<0.001) wasfound. In keratoconus participants, the mean age was 23.7 years (21- 26). The mean CCT takenwith Pentacam HR and US Pachymetry was 476μm (SD± 16.980) and 465μm (SD± 35.868)respectively. The t-test showed no statistical difference between thepentacam HR andultrasound pachymetry (p>0.214). Conclusion: Measurements of central corneal thicknessdone with Ultrasound Pachymeter and Pentacam HR are closely related to each other andare interchangeable when used in normal refractive error cases. While in Keratonus patientsultrasound pachymetry is preferred because of its reliability.

scholarly journals Usefulness of the Non-Contact Tonometry in Out-Patient Screening

2016 ◽  
Vol 15 (2) ◽  
Author(s):  
Satheesh Solomon T Selvin ◽  
Chris Elsa Samson Jacob ◽  
Thomas Kuriakose
Keyword(s):  
Central Corneal Thickness ◽  
Care Center ◽  
Corneal Thickness ◽  
Tertiary Care ◽  
Cross Sectional Study ◽  
Applanation Tonometry ◽  
Cross Sectional ◽  
Significant Difference ◽  
Iop Measurement ◽  
The Mean

Purpose: Goldmann applanation tonometry (GAT) is considered the gold standard for Intraocular Pressure (IOP) measurement. It has the disadvantages of being a contact device, need for a slit-lamp, non-portability and need of a skilled examiner. Many hospitals are using a Non Contact Tonometry (NCT) as a screening device to save clinician time, however the usefulness is not proved in terms of reliability. This study was aimed to determine the usefulness of the Air-puff tonometer (TONOREF NIDEK II, NIDEK CO., LTD., JAPAN) over a GAT in a tertiary care center. Design: Cross-sectional Study Methods: This was a cross-sectional, non interventional observational study conducted on 224 eyes (right eye) from 224 patients. All patients underwent the IOP measurement with both methods and a central corneal thickness (CCT) measured. The data was analyzed using SPSS 20.0 software. Results: The mean age of the patients was 40.3±11.29 years. There was a statistically significant difference (p<0.001) between the mean NCT and GAT readings which persisted even after correction for central corneal thickness. The correlation between NCT and GAT using Pearson’s correlation coefficient was strong irrespective of the corrections for their corneal thickness (r = 0.751 and 0.718 for uncorrected and corrected values respectively). The correlation of the individual clinicians for the readings varied from moderate to strong. The ROC curve showed the best sensitivity and specificity to occur at around 13 to 14 mmHg. Conclusion: NCT seems to overestimate the IOP at low ranges as compared to the GAT and underestimate at higher ranges. The crossover of the values is seen between 12 to 13 mmHg.  The clinician should do an individualized analysis of his/her GAT measurements to the readings of the NCT machine at the clinic to obtain clinician specific nomogram. 

scholarly journals The pattern of central corneal thickness in patients attending a Tertiary Hospital in Dar-Es-Salaam

2021 ◽  
Vol 9 (2) ◽  
pp. 127-133
Author(s):  
Annamary Stanislaus ◽  
Ntsilane Susan Mosenene ◽  
Celina Mhina ◽  
John Stanslaus Kisimbi ◽  
Frederick Robert Burgess ◽  
...  
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Dar Es Salaam ◽  
Applanation Tonometry ◽  
P Value ◽  
Muhimbili National Hospital ◽  
National Hospital ◽  
Cross Sectional ◽  
Significant Difference ◽  
The Mean

Background: Central Corneal Thickness (CCT) is an indicator of corneal health status as well as being an essential tool in assessment and management of corneal diseases. It is an important factor in the diagnosis and management of glaucoma as it affects the measurement of intraocular pressure. However, the pattern of central corneal thickness in our population is not known. Our study aimed to describe the CCT measurements and their variation with age and sex among patients attending the eye clinic at Muhimbili National Hospital (MNH), in Dar es Salaam, Tanzania. Methodology: A hospital-based descriptive, cross-sectional study used convenient sampling to recruit adult patients aged 18 years and above, presenting to the MNH between August 2016 and January 2017.Visual acuity assessment, Goldman applanation tonometry and CCT assessment using an ultrasound pachymeter were performed. Patients with previous intraocular surgery were excluded. Results: A total of 398 patients (208 males and 190 females) were recruited. The mean CCT was 526.64±38.30 µm; being 523.99±38.20 µm for males and 529.7±38.3 µm for females. 226 (56.85%) had CCT of less than 520 µm.There was no statistically significant difference in CCT between gender. The proportion of patients with thinner CCT increased with increasing age from 25.8% in those < 30 years to 75% in those aged 71years and above. The mean CCT decreased with increasing age with P-value<0.001. Conclusion: The average CCT in patients attending Muhimbili National Hospital is 526.64 µm (SD 38.30) which is generally thin, inversely proportion to age and similar that of other Africans and African-Americans. This finding has implications for the management of glaucoma in this population.

scholarly journals Measurements of Corneal Thickness in Eyes with Pseudoexfoliation Syndrome: Comparative Study of Different Image Processing Protocols

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Katarzyna Krysik ◽  
Dariusz Dobrowolski ◽  
Katarzyna Polanowska ◽  
Anita Lyssek-Boron ◽  
Edward A. Wylegala
Keyword(s):  
Time Domain ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Imaging Systems ◽  
Pressure Measurements ◽  
Swept Source ◽  
Swept Source Oct ◽  
The Mean ◽  
Thickness Measurements ◽  
Cataract Patients

Purpose. Comparative analysis of central and peripheral corneal thickness in PEX patients using three different imaging systems: Pentacam-Scheimpflug device, time-domain optical coherence tomography (OCT) Visante, and swept-source OCT Casia. Materials and Methods. 128 eyes of 80 patients with diagnosed PEX were examined and compared with 112 normal, non-PEX eyes of 72 cataract patients. The study parameters included 5 measured zones: central and 4 peripheral (superior, inferior, nasal, and temporal). Results. The mean CCT in eyes with PEX syndrome measured with all three instruments was thicker than that in normal eyes. Corneal thickness measurements in the PEX group were statistically significantly different between Pentacam and OCT Casia: central corneal thickness (p=0.04), inferior corneal zone (p=0.01), and nasal and temporal corneal zones (p<0.01). Between Pentacam and OCT Visante inferior, nasal and temporal corneal zones were statistically significantly different (p<0.01). Between OCT Casia and OCT Visante, there were no statistically significant differences in measured parameters values. Conclusion. The central corneal thickness in eyes with PEX syndrome measured with three different independent methods is higher than that in the non-PEX group, and despite variable peripheral corneal thickness, this one parameter is still crucial in intraocular pressure measurements.

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.

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