scholarly journals Corneal thickness evaluation in healthy eyes: Comparison between two different Scheimpflug devices

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0243370
Author(s):  
Nicola Rosa ◽  
Maddalena De Bernardo ◽  
Angela Pepe ◽  
Livio Vitiello ◽  
Giuseppe Marotta ◽  
...  
Keyword(s):  
Observational Study ◽  
Corneal Thickness ◽  
Pupil Center ◽  
Regression Formula ◽  
Ct Measurements ◽  
Corneal Apex ◽  
Thickness Evaluation ◽  
Healthy Eyes

Purpose To evaluate the correlation between corneal thickness (CT) measurements obtained with two Scheimpflug devices, Pentacam HR and Precisio, and to elaborate, if necessary, a regression formula which could make these results comparable. Design Retrospective, Comparative, Observational study. Setting Department of Medicine, Surgery and Dentistry, “Scuola Medica Salernitana” University of Salerno, Italy Methods One hundred twenty four healthy eyes of 124 volunteers (65 males; range: 20–32 years; mean age of 24.8 ± 1.7) were included in this study. CT was measured using Pentacam HR and Precisio in three different points: the pupil center (PC), the corneal apex (CA) and the thinnest point (TP). Results CT obtained with both devices at the PC, at the CA and at the TP showed a good correlation (r = 0.97, r = 0.97, r = 0.97, respectively), but Pentacam HR measurements were significantly thicker than those provided by Precisio (p < 0.01). The differences between Pentacam HR and Precisio were 21.9 ± 8.8 μm at the PC, 21.9 ± 8.9 μm at the CA, 19.1 ± 9.0 μm at the TP. The calculated regression formulas were: y = 0.9558x + 2.3196 for the PC, y = 0.9519x + 4.5626 for the CA, y = 0.9364x + 15.436 for the TP, where x is the CT measured with Pentacam HR and y is the Precisio measurement. Conclusions The findings provided by this study highlight that Precisio measures thinner corneas compared to Pentacam HR. The identified regression formulas could be utilized to make interchangeable the results obtained with these two devices.

scholarly journals Measurement of corneal thickness using Pentacam HR versus Nidek CEM-530 specular microscopy

2019 ◽  
Vol 48 (4) ◽  
pp. 030006051989238
Author(s):  
Maddalena De Bernardo ◽  
Palmiro Cornetta ◽  
Giuseppe Marotta ◽  
Giulio Salerno ◽  
Ilaria De Pascale ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
Corneal Thickness ◽  
Random Order ◽  
Time Of Day ◽  
Specular Microscopy ◽  
Pupil Center ◽  
Ct Measurements ◽  
Significant Difference ◽  
Corneal Apex

Objective To compare corneal thickness (CT) measurements using the CEM-530 (Nidal, Gamagori, Japan) and Pentacam HR (Oculus, Wetzlar, Germany). Methods The CT of 209 healthy subjects (209 right eyes) aged 24 to 89 years (71.35 ± 10.72 years) was measured at the corneal apex (CA), pupil center (PC), and thinnest point (TP) with the Pentacam HR and at the corneal center with the CEM-530 in random order at the same time of day. Results A good correlation but statistically significant difference was found between the CEM-530 and Pentacam HR measurements at the CA (6.10 ± 8.12 µm, R2 = 0.8947), PC (7.46 ± 8.57 µm, R2 = 0.8826), and TP (12.44 ± 10.04 µm, R2 = 0.8392). Comparison of the two devices produced the following regression formulas: y = 0.8859x + 57.644 for the CA, y = 0.8852x +56.657 for the PC, and y = 0.8557x + 68.148 for the TP, where x is the CT obtained with the CEM-530 and y is that obtained with the Pentacam HR. Conclusions These findings indicate that the CEM-530 produces a thicker corneal measurement than the Pentacam HR. The herein-proposed correcting factors are needed to reliably compare these devices.

Central corneal thickness evaluation in healthy eyes with three different optical devices

2015 ◽  
Vol 38 (6) ◽  
pp. 409-413 ◽  
Author(s):  
Michele Lanza ◽  
Erica Paolillo ◽  
Ugo Antonello Gironi Carnevale ◽  
Alessandro Lanza ◽  
Carlo Irregolare ◽  
...  
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Optical Devices ◽  
Thickness Evaluation ◽  
Healthy Eyes

scholarly journals Comparison between two devices in the detection of corneal thickness changes after cataract surgery

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Maddalena De Bernardo ◽  
Livio Vitiello ◽  
Giulia Abbinante ◽  
Ilaria De Pascale ◽  
Luigi Capasso ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Corneal Thickness ◽  
Specular Microscopy ◽  
Slit Lamp ◽  
Thickness Increase ◽  
Pupil Center ◽  
Scheimpflug Camera ◽  
Corneal Apex

AbstractThis study compared corneal thickness (CT) changes obtained with specular microscopy (SM) and a rotating Scheimpflug camera (RSC) after conventional phacoemulsification surgery (PS). One hundred sixty six eyes of 83 patients were analyzed before and one month after PS. One eye underwent PS, while the fellow phakic one was used as control. CT was measured with SM at the center of the cornea and with RSC at the pupil center, at the corneal apex and at the thinnest point. In the operated eye, SM showed a larger CT mean increase than those one detected at the three different measurements’ points evaluated by RSC. Inversely, in the fellow phakic eye, SM showed a greater CT mean decrease than those one registered by RSC at its three measurement’s points. Thus, one month after surgery, even if cornea appears clear at the slit-lamp, a significant thickness increase is still present. This is even more evident if the slight decrease of the fellow phakic eye is considered. The differences between the two devices are probably related to the different measured areas.

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.

Clinical Profile of Myopic Patients as a Risk Factor for Primary Open Angle Glaucoma - A Prospective Observational Study in Gorakhpur, Uttar Pradesh

2021 ◽  
Vol 8 (33) ◽  
pp. 3084-3089
Author(s):  
Ram Kumar Jaiswal ◽  
Ramyash Singh Yadav ◽  
Mridula Ranjan ◽  
Dipti Wahi ◽  
Chiranji Rai
Keyword(s):  
Risk Factor ◽  
Intraocular Pressure ◽  
Observational Study ◽  
High Myopia ◽  
Central Corneal Thickness ◽  
Prospective Observational Study ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Corneal Thickness ◽  
Open Angle

BACKGROUND Myopia is a complex trait including both genetic and environmental factors as well as gene-environment interactions. It has been recognized as a risk factor for development of glaucoma. Both Myopia and raised IOP are known to increase mechanical stress at optic nerve head leading to glaucomatous nerve damage. This study intends to evaluate the clinical profile of myopic subjects and its correlation with Primary open angle glaucoma (POAG). METHODS A prospective observational study done from November 2019 to December 2020 after taking proper informed consent and ethical clearance. 164 eyes of 96 patients studied were divided into three groups, Group 1: low myopia (< -3.00D), Group 2: moderate myopia (-3.00 D to -5.75 D), Group 3: high myopia (≥ -6.00 D). A complete ocular examination was performed. Intraocular pressure was measured using Goldmann applanation tonometer. Visual field analysis using Humphrey automated perimetry was done in patients with suspected primary open angle glaucoma (POAG). Angle parameters and central corneal thickness (CCT) were measured using anterior segment optical coherence tomography (AS-OCT). RESULTS 164 eyes of 96 Myopic subjects were studied with no dropout during study period. Mean age was 46.05 yr. (range: 25-75 yr.). The refraction ranged from -0.50 DS to -17.00 DS. There was no statistically significant difference between Intraocular pressure (IOP), Central corneal thickness (CCT), corrected IOP and Nasal and Temporal Trabecular-iris Angle (TIA) between male and female of same age group. Mean IOP and mean CCT were found to vary significantly with age and with higher degree of myopia. Corrected IOP, Nasal and Temporal TIA increase significantly with higher degree of myopia. Cup-disc ratio (CDR) was found to be significantly higher in patients with moderate to high degree of Myopia. CONCLUSIONS Myopia is an important risk factor for development of primary open angle glaucoma, with its incidence increasing in patients with moderate to high myopia. KEYWORDS Myopia, Primary Open Angle Glaucoma, Intraocular Pressure, Central Corneal Thickness, Trabecular Iris Angle

scholarly journals Keratoconus: early onset, the worst prognosis, eye rubbing and hand-dominance

2020 ◽  
Vol 10 (4) ◽  
pp. 79-84
Author(s):  
Anisur Rahman ◽  
Sharah Rahman ◽  
Jamsed Faridi ◽  
Abdus Salam ◽  
Tarzia Asma Zafrullah ◽  
...  
Keyword(s):  
Observational Study ◽  
Central Corneal Thickness ◽  
Age Of Onset ◽  
Corneal Thickness ◽  
Young Patients ◽  
Close Monitoring ◽  
Dominant Hand ◽  
K Value ◽  
Group A ◽  
Group B

Purpose: Keratoconus is an ectatic disorder of cornea and mostly involve teen aged group, still the pathogenesis and aetiology is not clearly defined. We try to establish the progression of the diseases is inversely proportional to the age of onset of the patient. Design: It was an observational study, carried out at a private eye hospital where patient was referred for RGP contact lenses. Methods: This observational study was carried out from Jan’ 2017 to Dec’ 2019 total three year period and 304 patients with Keratoconus were in the initial study and we divided them into two groups. Group: A, ≤25 years old and Group: B, >25 years old but among these 304 patient we included 200 patients in our study those who completed minimum 3 years follow-up and meet the inclusion criteria. Results: After three years ‘K’ value in group: A, <0.0001 in group: B, <0.3655. Sim K’s Astigmatism <0.0001 in group: A. <0.0223 in group: B. Central corneal thickness <0.0001 in group: A and 0.1957 in group: B. ‘K’ value and central corneal thickness (CCT) deteriorate more in group: A, than group: B. It is also found that KC progress more in case of VKC and it is more prominent in dominant hand side. Conclusion: At diagnosis, keratoconus is often more advanced in children than in adults, with faster disease progression. Early detection and close monitoring are therefore crucial in young patients.

scholarly journals Reproducibility and repeatability of central corneal thickness measurement in healthy eyes using four different optical devices

2016 ◽  
Vol 37 (4) ◽  
pp. 1039-1045 ◽  
Author(s):  
Remzi Karadag ◽  
Murat Unluzeybek ◽  
Ozgur Cakici ◽  
Ayse Yagmur Kanra ◽  
Huseyin Bayramlar
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Optical Devices ◽  
Thickness Measurement ◽  
Healthy Eyes

scholarly journals Repeatability and Agreement of Central Corneal Thickness and Keratometry Measurements between Four Different Devices

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Laszlo Kiraly ◽  
Jana Stange ◽  
Kathleen S. Kunert ◽  
Saadettin Sel
Keyword(s):  
Clinical Practice ◽  
Statistical Analysis ◽  
Correlation Coefficient ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Intraclass Correlation ◽  
Bland Altman Method ◽  
Significant Difference ◽  
Healthy Eyes ◽  
Iolmaster 700

Background.To estimate repeatability and comparability of central corneal thickness (CCT) and keratometry measurements obtained by four different devices in healthy eyes.Methods.Fifty-five healthy eyes from 55 volunteers were enrolled in this study. CCT (IOLMaster 700, Pentacam HR, and Cirrus HD-OCT) and keratometry readings (IOLMaster 700, Pentacam HR, and iDesign) were measured. For statistical analysis, the corneal spherocylinder was converted into power vectors (J0, J45). Repeatability was assessed by intraclass correlation coefficient (ICC). Agreement of measurements between the devices was evaluated by the Bland-Altman method.Results.The analysis of repeatability of CCT data of IOLMaster 700, Pentacam HR, and Cirrus HD-OCT showed high ICCs (range 0.995 to 0.999). The comparison of CCT measurements revealed statistically significant differences between Pentacam HR versus IOLMaster 700 (p<0.0001) and Pentacam HR versus Cirrus HD-OCT (p<0.0001), respectively. There was no difference in CCT measurements between IOLMaster 700 and Cirrus HD-OCT (p=0.519). The repeatability of keratometry readings (J0 and J45) of IOLMaster 700, Pentacam HR, and iDesign was also high with ICCs ranging from 0.974 to 0.999. The Pentacam HR revealed significantly higher J0 in comparison to IOLMaster 700 (p=0.009) and iDesign (p=0.041); however, no significant difference was between IOLMaster 700 and iDesign (p=0.426). Comparison of J45 showed no significant difference between IOLMaster 700, Pentacam HR, and iDesign. These results were in accordance with Bland-Altman plots.Conclusion.In clinical practice, the devices analyzed should not be used interchangeably due to low agreement regarding CCT as well as keratometry readings.

Sign in / Sign up

Export Citation Format

Share Document