The dependence of the tonometry on the cornea thickness in individuals with varying clinical refraction

2019 ◽  
pp. 98-100
Author(s):  
S.Y. Totskova ◽  
◽  
N.A. Nikitin ◽  
Keyword(s):  
Cornea Thickness

scholarly journals Two Years’ Experience in Keratoconus Treatment using Collagen Cross-linking

2017 ◽  
Vol 6 (1) ◽  
pp. 11-13
Author(s):  
Dimitrii Dementiev ◽  
Maria Sysoeva ◽  
Anna Shipunova
Keyword(s):  
Visual Acuity ◽  
Cross Linking ◽  
Stage Of Disease ◽  
Central Cornea ◽  
Uncorrected Visual Acuity ◽  
Keratorefractive Surgery ◽  
Cornea Thickness ◽  
Central Cornea Thickness ◽  
Collagen Cross Linking

ABSTRACT Purpose To evaluate safety, efficacy, and stability of cross-linking (CLX) procedure as a method for keratoconus treatment in the I and II stage of disease. Materials and methods Twenty eyes of 15 patients (13 males, 2 females, average age 31 years) with keratoconus I stage (13 eyes) and II stage (2 eyes) (by Krumeich classi­fication) were treated by CLX procedure, using riboflavin Medio Cross for standard CLX); riboflavin Medio Cross TE for transepithelial CLX was used to treat keratectasia after previous keratorefractive surgery; in all the cases UV CBM X linker (Vega, CSO) was used. The study included evaluation of uncorrected visual acuity (UCVA), best-corrected visual acuity (BCVA) pre- and postoperative, pachymetry (central cornea thickness) (Visante OCT, Zeiss) pre- and postoperative, total astigmatism pre- and postoperative, using keratotopography (Atlas, Zeiss). Diagnosis and analysis have been performed at the International Center for Ophthalmology in Moscow, Russian ­Federation, since 2012 to 2014 years. Follow-up period was from 1 to 24 months. Results Average UCVA preoperative was 0.4 (Decimal), and average BCVA was 0.64. Average UCVA postoperative was 0.49; average BCVA was 0.66. Total astigmatism preoperative was 2.81 D; total astigmatism postoperative 2.80 D. Central cornea thickness (CCT) preoperative 454 mkm; CCT post­operative 447 mkm. Conclusion Cross-linking indicated safety, stability, and efficacy for treatment of I and II stage keratoconus at the end of follow-up period. Cross-linking is not effective in the treatment of II and III stage of disease. Further study is required. How to cite this article Dementiev D, Sysoeva M, Shipunova A. Two Years’ Experience in Keratoconus Treatment using Collagen Cross-linking. Int J Kerat Ect Cor Dis 2017;6(1):11-13.

scholarly journals New loci associated with central cornea thickness include COL5A1, AKAP13 and AVGR8

2010 ◽  
Vol 19 (21) ◽  
pp. 4304-4311 ◽  
Author(s):  
Veronique Vitart ◽  
Goran Benčić ◽  
Caroline Hayward ◽  
Jelena Škunca Herman ◽  
Jennifer Huffman ◽  
...  
Keyword(s):  
Central Cornea ◽  
Cornea Thickness ◽  
Central Cornea Thickness

Cornea thickness measuring ultrasonic probe

1990 ◽  
Vol 87 (2) ◽  
pp. 930-930
Author(s):  
Toshio Sakane
Keyword(s):  
Ultrasonic Probe ◽  
Cornea Thickness

scholarly journals Ocular Effects of Exposure to 40, 75, and 95 GHz Millimeter Waves

2018 ◽  
Vol 39 (9) ◽  
pp. 912-925 ◽  
Author(s):  
Masami Kojima ◽  
Yukihisa Suzuki ◽  
Kensuke Sasaki ◽  
Masao Taki ◽  
Kanako Wake ◽  
...  
Keyword(s):  
Millimeter Waves ◽  
Corneal Thickness ◽  
Corneal Edema ◽  
Incident Power ◽  
Fluorescence Staining ◽  
Corneal Epithelial ◽  
Incident Power Density ◽  
Focus Type ◽  
Power Densities ◽  
Cornea Thickness

Abstract The objective of this study was to develop a model of ocular damage induced by 40, 75, and 95 GHz continuous millimeter waves (MMW), thereby allowing assessment of the clinical course of ocular damage resulting from exposure to thermal damage-inducing MMW. This study also examined the dependence of ocular damage on incident power density. Pigmented rabbit eyes were exposed to 40, 75, and 95 GHz MMW from a spot-focus-type lens antenna. Slight ocular damage was observed 10 min after MMW exposure, including reduced cornea thickness and reduced transparency. Diffuse fluorescein staining around the pupillary area indicated corneal epithelial injury. Slit-lamp examination 1 day after MMW exposure revealed a round area of opacity, accompanied by fluorescence staining, in the central pupillary zone. Corneal edema, indicative of corneal stromal damage, peaked 1 day after MMW exposure, with thickness gradually subsiding to normal. Three days after exposure, ocular conditions had almost normalized, though corneal thickness was slightly greater than that before exposure. The 50% probability of ocular damage (DD50) was in the order 40 > 95 ≈ 75 GHz at the same incident power densities.

scholarly journals Ocular Biometrics of Vietnamese Young Adults with Myopia

2019 ◽  
Vol 7 (24) ◽  
pp. 4283-4286
Author(s):  
Hien Thi Thu Nguyen ◽  
Dung Thi Thanh Nguyen ◽  
Dong Ngoc Pham ◽  
Anh Phuong Tran ◽  
Do Quyet ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Axial Length ◽  
Pearson Correlation ◽  
Anterior Chamber Depth ◽  
Spherical Equivalent ◽  
Central Cornea ◽  
Spherical Equivalent Refraction ◽  
Cornea Thickness ◽  
Central Cornea Thickness ◽  
Biometric Indices

BACKGROUND: Myopia is most prevalent type of refraction error. In some Asian countries, the prevalence of myopia can be 80 – 90% in the population aged 17 – 18. AIM: To analyze the correlation between ocular biometric indices and refraction status in Vietnamese young myopes. METHODS: A prospective cross – section study was conducted in young myopes. Data on axial length, central cornea thickness, corneal topography & anterior chamber depth and spherical equivalent were collected. Independent Sample T Test and ANOVA test were used to compare between groups. The correlations between ocular biometry and myopic spherical equivalent refraction were examined by Pearson Correlation with the level of significance p < 0.05. RESULTS: Totally, 418 eyes from 209 patients were recruited. The average axial length, central cornea thickness, cornea refraction & anterior chamber depth were 25.68 ± 1.09 mm, 539.78 ± 32.665 µm, 43.16 ± 1.369 D, 3.30 ± 0.243 mm, respectively. The correlation between axial length and spherical equivalent refraction (SER) was high (r = - 0.742, p < 0.0001) while those between central cornea thickness and cornea refraction were negligible (r = - 0.107, p = 0.029; r = -0.123, p = 0.012; respectively). There was no correlation between anterior chamber depth and spherical equivalent refraction (r = 0.019, p = 0.697). CONCLUSION: Among ocular biometric indices, axial length was significantly correlated with spherical equivalent of young adult patients.

scholarly journals Glaucoma in self-reported relatives and non-relatives of Igbo glaucoma patients in Enugu, Nigeria

2021 ◽  
Vol 9 (3) ◽  
pp. 218-225
Author(s):  
Nkiru Nwamaka Kizor-Akaraiwe
Keyword(s):  
General Population ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Population Groups ◽  
Central Cornea ◽  
Glaucoma Diagnosis ◽  
Eye Screening ◽  
Screening Services ◽  
Cornea Thickness ◽  
Central Cornea Thickness

Purpose: To compare proportion of glaucoma and the associated factors among self-reported relatives and non-relatives of predominantly Igbo glaucoma patients Methods: An analytical cross-sectional survey of participants attending a free eye screening dedicated to relatives of glaucoma relatives in Enugu, Nigeria was carried out in July 2017. Non-relatives of glaucoma patients were expected to present for the free screening hence they were allowed to participate to prevent false claims. All participants were interviewed and underwent ophthalmic examinations. Glaucoma diagnosis was based on the ISGEO classification criteria adapted for Nigeria. Participants were subsequently grouped as glaucoma relatives and general population. Results: Forty-two and 56 participants were included in the relatives and general population groups respectively. The proportion of glaucoma in the relatives and general population groups was 43% and 20% respectively. The odds of having glaucoma was three times higher in relatives of patients than in general population (OR= 3.07, 95% CI; 1.25 – 7.5 p=0.013). About 52% of first-degree relatives were diagnosed with glaucoma. In the relatives’ group, 100% of siblings, 40% of children and 0% of parents had glaucoma. Proportion increased with age. Relatives were significantly younger than their probands at diagnosis (16years, p= 0.000). Only 5.6% of the relatives’ group were previously aware of diagnosis. Intraocular pressure and central cornea thickness were similar in both relatives and general population groups. Conclusions: In this screened Igbo population, over one-third of the relatives’ group and about one fifth of general population had glaucoma. Relatives were diagnosed at an earlier age. These findings will aid the advocacy for routine glaucoma family screening services.

scholarly journals Comparison of Four Methods for Corneal Thickness Measurement

2013 ◽  
Vol 6 (1) ◽  
pp. 37-42
Author(s):  
Teodora L. Marinova ◽  
Vesela Ivancheva ◽  
Svilena S. Peeva ◽  
Christina N. Grupcheva
Keyword(s):  
Optical Coherence Tomography ◽  
Laser Scanning ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Anterior Segment ◽  
Laser Scanning Confocal Microscopy ◽  
Thickness Measurement ◽  
Specular Microscopy ◽  
Optical Coherence ◽  
Cornea Thickness

Summary The aim of the study was to evaluate the thickness of the normal cornea in order to establish correlation between four methods of measuring including: ultrasound pachymetry (USP), anterior segment optical coherence tomography (ASOCT), non-contact tono/pachymetry (TONOPACHY) and laser-scanning confocal microscopy (LSCM). The study was based on evaluating repeatability and comparability of four different methods formeasuring the corneal thickness. Non contact specular microscopy was first performed on all 27 patients (aged between 20 and 24 years) to evaluate corneal characteristics and confirm the absence of pathological changes. Each participant was examined by USP, ASOCT and TONOPACHY, and 13 eyes of 10 persons were also examined by LSCM. The values of average central corneal thickness measured by USP, ASOCT, TONOPACHY and LSCM were 532.20±4.5 pm, 553.33±12.1 pm, were 548.20±5.62 pm and 573.33±7.22 pm, respectively. There was a high correlation between the instruments. The mean differences for central corneal thickness measurements were 41.43±1.67 pm between USP and LSCM, 20.43±2.4 pm between USP and ASOCT, and 22.1 ±3.88 pm between USB and TONOPACHY. Anterior segment optical coherence tomography overestimated corneal thickness as compared with that measured by USP, which is believed to be a gold standard. Anterior segment optical coherence tomography had better agreement with USP, as compared with LSCM. However, the results of measured cornea thickness by TONOPACHY were very close to cornea thickness measured by ASOCT.

Characteristic of the central cornea thickness in healthy children and in patients with congenital glaucoma

2021 ◽  
pp. 161-163
Author(s):  
A.Y. Baranov ◽  
◽  
V.V. Brzheskii ◽  
M.N. Chistyakova ◽  
N.N. Sadovnikova ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Applanation Tonometry ◽  
Congenital Glaucoma ◽  
Healthy Children ◽  
Optical Coherence ◽  
Average Value ◽  
Cornea Thickness ◽  
Optical Coherence Tomograph

Background. Ophthalmic hypertension is one of the most important diagnostic criteria for congenital glaucoma. The «gold standard» for measuring intraocular pressure (IOP) is the applanation tonometry (Maklakov and Goldmann methods). However, the thickness of the central corneal zone has a significant effect on the value of IOP measured by these methods. The aim of this study was to compare the central corneal thickness (CCT) in children with congenital glaucoma and in healthy children. Material and methods. We examined 15 children aged from 7 months to 14 years (22 eyes) with congenital glaucoma. In the healthy children group, 26 subjects from 7 to 17 years old (51 eyes) were examined. CCT was measured in all subjects using the optical coherence tomograph Carl Zeiss Cirrus HD-OCT 5000 with an external lens for cornea scanning. The examination was carried out in pachymetry mode; the average thickness of the central ring having a diameter of 2 mm was evaluated. Results. Central corneal thickness in children with glaucoma ranged from 471 to 771 microns, the average value was 561.5±72.26 microns. In the group of healthy children, CCT was in the range of 480-597 microns with an average value of 529.88±29.33 microns. Thus, we noted a higher average value of the central corneal thickness and its higher variability in children with glaucoma in comparison with the group of healthy children. Conclusion. All children with glaucoma and suspected glaucoma should routinely perform pachymetry prior to applanation tonometry. One should consider the central corneal thickness when assessing intraocular pressure. Key words: congenital glaucoma, pachymetry, optical coherence tomography, central corneal thickness, applanation tonometry, intraocular pressure.

INCREASED CENTRAL CORNEA THICKNESS IN SYSTEMIC SCLEROSIS

2009 ◽  
Vol 62 (1) ◽  
pp. 69-74 ◽  
Author(s):  
LISBETH SERUP ◽  
JØRGEN SERUP ◽  
HANS K. HAGDRUP
Keyword(s):  
Systemic Sclerosis ◽  
Central Cornea ◽  
Cornea Thickness ◽  
Central Cornea Thickness
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