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Noya-Padin V, Nores-Palmas N, Giraldez MJ, Yebra-Pimentel E, Pena-Verdeal H. Comparison Between Ocular Biometric Parameters and Intraocular Pressure With and Without Contact Lenses. Eye Contact Lens 2023; 49:464-470. [PMID: 37713633 DOI: 10.1097/icl.0000000000001030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/19/2023] [Indexed: 09/17/2023]
Abstract
OBJECTIVES To compare the values of central corneal thickness, anterior chamber depth (ACD), lens thickness (LT), vitreous length (VL), axial length (AL), and corneal-compensated intraocular pressure performed with and without contact lenses (CL). METHODS Forty volunteer participants (16 men and 24 women, 24.2±2.9 years) were recruited. In a single visit, participants underwent autorefraction, keratometry, biometry, topography, pachymetry, and tonometry with the naked eye (without CL). Then, biometry, pachymetry, and tonometry were repeated twice wearing two CL (somofilcon A and nesofilcon A) fitted in a random order. RESULTS Many of the ocular biometric values were affected by the use of CL during measurements (paired t test; all P ≤0.003), except for LT and VL (Wilcoxon test; both P ≥0.272). Corneal-compensated intraocular pressure was also affected by contact lens wear during measurements, obtaining lower values when wearing them (Wilcoxon test; all P ≤0.001). CONCLUSIONS Central corneal thickness, ACD, AL, and corneal-compensated intraocular pressure measurements cannot be performed while wearing CL. However, LT and VL measurements were not affected by any contact lens use. In addition, it was observed that ACD results from both devices are not interchangeable either when measured with the naked eye or using any contact lens.
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Affiliation(s)
- Veronica Noya-Padin
- Applied Physics Department (Optometry Area) (V.N.-P., N.N.-P., M.J.G., E.Y.-P., H.P.-V.), Facultade de Óptica e Optometría, Universidade de Santiago de Compostela; and Optometry Group (M.J.G., E.Y.-P., H.P.-V.), Instituto de Investigación Sanitaria Santiago de Compostela (IDIS), Santiago de Compostela, Spain
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Noya-Padin V, Garcia-Queiruga J, Sabucedo-Villamarin B, Nores-Palmas N, Taboada-Mecias R, Yebra-Pimentel E. Intraocular Pressure Fluctuation Throughout the Day. Cureus 2023; 15:e48826. [PMID: 38106705 PMCID: PMC10722343 DOI: 10.7759/cureus.48826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/14/2023] [Indexed: 12/19/2023] Open
Abstract
Purpose To compare intraocular pressure (IOP) values at different time points, both in the total sample and according to iridocorneal angle aperture, to assess whether IOP fluctuations were constant throughout the day, and to examine correlations with other factors. Methods Over a single day, the IOP of 34 volunteers was measured at three-hour intervals from 9:00 a.m. to 6:00 p.m. To avoid any IOP value being affected by other measurements, anamnesis, slit-lamp evaluation (with iridocorneal angle measurement), and refractive status were performed after the final measurement. The differences between IOP values at different time points and IOP fluctuation at three-hour intervals were compared by ANOVA and Friedman test, respectively, both for the total group and according to iridocorneal angle aperture. For relationships, Pearson's correlation was performed for parametric variables and Spearman's correlation for nonparametric variables. Results Significant differences were observed in IOP between time points for the total sample (p < 0.001), but not for a narrow-angle group (p = 0.058). No significant differences were found in IOP fluctuations at three-hour intervals either in the total sample or according to angle aperture (all p ≥ 0.332). There was a positive correlation of IOP at different time points (all r ≥ 0.646, all p < 0.001) but no relationship with spherical equivalent, age, or sleep duration (all p ≥ 0.057). IOP at 12:00 p.m. was correlated with a 12:00 p.m. to 3:00 p.m. fluctuation (r = 0.428, p = 0.012); and IOP fluctuation between 9:00 a.m. and 12:00 p.m. was correlated with age (r = 0.485, p = 0.004). Conclusion As IOP decreases from morning until at least 6:00 p.m., measuring these two values during clinical evaluation is essential for the effective monitoring and prevention of IOP-related diseases.
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Affiliation(s)
- Veronica Noya-Padin
- Department of Applied Physics (Optometry Area), Universidade de Santiago de Compostela, Santiago de Compostela, ESP
- Department of Optometry, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, ESP
| | - Jacobo Garcia-Queiruga
- Department of Applied Physics (Optometry Area), Universidade de Santiago de Compostela, Santiago de Compostela, ESP
- Department of Optometry, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, ESP
| | - Belen Sabucedo-Villamarin
- Department of Applied Physics (Optometry Area), Universidade de Santiago de Compostela, Santiago de Compostela, ESP
| | - Noelia Nores-Palmas
- Department of Applied Physics (Optometry Area), Universidade de Santiago de Compostela, Santiago de Compostela, ESP
| | - Ricardo Taboada-Mecias
- Department of Applied Physics (Optometry Area), Universidade de Santiago de Compostela, Santiago de Compostela, ESP
| | - Eva Yebra-Pimentel
- Department of Applied Physics (Optometry Area), Universidade de Santiago de Compostela, Santiago de Compostela, ESP
- Department of Optometry, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, ESP
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Noya-Padin V, Garcia-Queiruga J, Iacubitchii M, Giraldez MJ, Yebra-Pimentel E, Pena-Verdeal H. Lenstar LS900 vs EchoScan US-800: comparison between optical and ultrasound biometry with and without contact lenses and its relationship with other biometric parameters. Expert Rev Med Devices 2023. [PMID: 37402231 DOI: 10.1080/17434440.2023.2233410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 05/23/2023] [Accepted: 06/15/2023] [Indexed: 07/06/2023]
Abstract
BACKGROUND Due to the increasing use of contact lenses (CL) and the interest in ocular and body size relationships, this study aimed to compare measurements from two biometers (contact ultrasonic EchoScan US-800 and non-contact optical Lenstar LS900) with and without CL and to explore the relationship between ocular and body biometric parameters. DESIGN AND METHODS This cross-sectional study measured ocular biometry using two biometers along with their body height and right foot length in 50 participants. Differences between biometry data from the two devices were compared and correlations between ocular and body biometric values were analyzed. RESULTS All parameters showed interbiometric differences (p ≤ 0.030), except crystalline lens thickness during CL wear (p = 0.159). Comparing measurements with and without CL, differences were observed in axial length (p < 0.001), vitreous length measured by optical biometer (p = 0.016), and anterior chamber depth by ultrasonic biometer (p < 0.016). Lens thickness remained unaffected (p ≥ 0.190). Body height and foot length were correlated with anterior chamber depth, vitreous length, and axial length (p ≤ 0.019, r ≥ 0.330). Most biometric parameters were correlated among them using both devices (p ≤ 0.037, r ≥ 0.296). CONCLUSIONS These biometers are not interchangeable and CL affects measurements. Body height and foot length correlate with ocular dimensions, and most ocular biometric values correlate positively.
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Affiliation(s)
- Veronica Noya-Padin
- Departamento de Física Aplicada (Área de Optometría), Santiago de Compostela, Galicia, Spain
| | - Jacobo Garcia-Queiruga
- Departamento de Física Aplicada (Área de Optometría), Santiago de Compostela, Galicia, Spain
| | - Maria Iacubitchii
- Ophthalmology Department, Nicolae Testemitanu State University of Medicine and Pharmacy, Chisinau, Republic of Moldova
| | - Maria J Giraldez
- Departamento de Física Aplicada (Área de Optometría), Santiago de Compostela, Galicia, Spain
- Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Eva Yebra-Pimentel
- Departamento de Física Aplicada (Área de Optometría), Santiago de Compostela, Galicia, Spain
- Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Hugo Pena-Verdeal
- Departamento de Física Aplicada (Área de Optometría), Santiago de Compostela, Galicia, Spain
- Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
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Park HY, Shin HY. Comparison of Central Corneal Thickness Measured by Tono-pachymetry and Ultrasound Pachymetry. JOURNAL OF THE KOREAN OPHTHALMOLOGICAL SOCIETY 2021. [DOI: 10.3341/jkos.2021.62.7.904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Purpose: We compared the accuracy of central corneal thickness (CCT) measurements according to CCT measured by noncontact Tono-pachymetry and ultrasound pachymetry (USP). Methods: CCT was measured in 90 eyes of 90 subjects by two optometrists. The CCT measurements were compared and the correlations between the measurements were analyzed. To evaluate whether the measurements varied depending on CCT, the subjects were classified into three groups according to CCT (group 1: thin thickness group; group 2: medium thickness group; and group 3: thick thickness group). The differences in CCT obtained by the two devices (△CCT = Tono-pachymetry-USP) were compared and analyzed among the three groups. Results: The average CCT measurements by Tono-pachymetry and USP were 523.26 ± 32.93 μm and 527.08 ± 37.33 μm, respectively. CCT by Tono-pachymetry was significantly thinner than by USP (△CCT= -3.82 ± 15.34, p = 0.020). The two measurements were strongly correlated (r = 0.912, p < 0.001). The △CCT values were 5.40 ± 12.13 μm in group 1, -6.37 ± 15.07 μm in group 2, and -10.50 ± 14.39 μm in group 3 (p < 0.001). Conclusions: CCT measured by tono-pachymetry was thinner on average compared to the value measured by USP and the differences in measurements between the two devices were different according to CCT. The thinner the CCT, the thicker the measurement, and the thicker the CCT, the thinner the measurement. Therefore, this trend should be considered when interpreting tono- pachymetry results in clinical practice.
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Kim JS, Rho CR, Cho YW, Shin J. Comparison of corneal thickness measurements using ultrasound pachymetry, noncontact tonopachy, Pentacam HR, and Fourier-domain OCT. Medicine (Baltimore) 2021; 100:e25638. [PMID: 33879743 PMCID: PMC8078248 DOI: 10.1097/md.0000000000025638] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Accepted: 03/28/2021] [Indexed: 01/04/2023] Open
Abstract
We retrospectively compared the central corneal thickness (CCT) obtained by ultrasound pachymetry (USP; SP-3000, Tomey Corp., Nagoya, Japan), non-contact tonopachy (TP) (NT-530P, Nidek Co., Ltd., Gamagori, Japan), Pentacam HR (OCULUS Inc., Wetzlar, Germany), and RTVue optical coherence tomography (OCT) (Optovue Inc., Fremont, CA, USA) in 78 eyes of 78 healthy subjects with myopia. Agreement between the measurement methods was evaluated using 95% confidence intervals for the limits of agreement (LoA). The mean CCT values were 546.9 ± 34.7, 548.1 ± 33.5, 559.2 ± 34.0, and 547.2 ± 34.8 μm for USP, non-contact TP, Pentacam, and RTVue, respectively. The thickest and the thinnest mean CCT values corresponded to those obtained by Pentacam HR and USP, respectively. Plots of the differences against the means showed the best agreement between USP and RTVue (LoA, 10.14-10.70 μm), while the largest discrepancy was observed between RTVue and Pentacam systems (LoA, -25.47-1.44 μm). Our data showed that CCT measurements using these 4 instruments were well correlated. However, the results from Pentacam differed significantly from those of the other instruments.
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Affiliation(s)
| | - Chang Rae Rho
- Department of Ophthalmology and Visual Science, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Daejeon, Republic of Korea
| | - Yeon Woo Cho
- Department of Ophthalmology and Visual Science, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Daejeon, Republic of Korea
| | - Jeongah Shin
- Department of Ophthalmology and Visual Science, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Daejeon, Republic of Korea
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Teberik K, Eski MT, Ankarali H. Comparison of central corneal thickness and intraocular pressure measured with two different tono/pachymeter devices in non-glaucomatouse children. Eur J Ophthalmol 2021; 31:3010-3017. [PMID: 33525899 DOI: 10.1177/1120672121991492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
PURPOSE The goal of this research is to compare the intraocular pressure (IOP) and the mean central corneal thickness (CCT) values obtained from the measurements with Nidek NT-530P and Canon TX-20P devices with the values obtained by ultrasound pachymetry (UP) and Goldmann applanation tonometry (GAT) in children. METHODS This prospective study was conducted with 119 healthy children. The measurements were repeated three times for each eye. The intraclass correlation coefficient (ICC) was used to assess the correlation between the measurements obtained from different devices. The Bland-Altman plot was used to analyze the agreement between two different devices graphically. The measurements were taken in the same order in all subjects: TX-20P, NT-530P, UP, and GAT. RESULTS The mean age of the children was 10.1 ± 3.2 (6-17) years. The mean CCT values for the eyes were 568.90 and 569.68 (TX-20P), 571.44 and 566.37 (NT-530P), 564.77 and 564.67 μm UP, (right and left, respectively). The highest correspondence observed for CCT was between UP and NT-530P devices (ICC, 0.982, the left eye). The mean IOP measurements for Canon TX-20P, NT-530P, and GAT were 16.5 ± 3.2, 16.3 ± 3.2, and 16.8 ± 3.6 mmHg for the right eyes, respectively, while those for the left eyes were 16.6 ± 3.1, 16.2 ± 3.3, and 16.8 ± 3.7 mmHg. The highest correspondence was noted between measurements obtained using GAT and Nidek NT-530P devices (ICC, 0.945, in the left eye). CONCLUSION Tono/pachymetry devices in the healthy children are provides significant agreements with the gold standard methods for IOP and CCT measurements.Clinical Trial Registration number: 2016-94.
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Affiliation(s)
- Kuddusi Teberik
- Department of Ophthalmology, Düzce University Medical School, Düzce, Turkey
| | | | - Handan Ankarali
- Biostatistics and Medical Informatics Department, İstanbul Medeniyet University Faculty of Medicine, Istanbul, Turkey
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Kouassi Rebours AC, Kouassi FX, Soumahoro M, Koman Chiatse Ellalie CE, Alla Ngoran Siméon KRA, Agbohoun RP. [Comparison of Goldmann tonometry with air-puff tonometry. A study of 159 patients in Abidjan]. J Fr Ophtalmol 2020; 44:41-47. [PMID: 33158610 DOI: 10.1016/j.jfo.2020.03.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 02/08/2020] [Accepted: 03/23/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE The goal of this study was to compare the intraocular pressure (IOP) values obtained with each of the tonometry methods as well as to study the effect of corneal pachymetry on the measurements obtained by each method. MATERIAL AND METHODS We carried out a cross-sectional, descriptive, analytical, prospective study in the ophthalmology department of a multispecialty clinic in Abidjan (Ivory Coast) from April 2018 to August 2018. Patients aged 15 and over were included in the study. Over this period, IOP was measured by Goldman Applanation Tonometer (HaagStreit, AT 900, Switzerland) and air-puff Tonopachymeter (Nidek, NT 530 P, Japan), which also permitted measurement of central optical corneal pachymetry. The data analyzed focused on socio-demographic characteristics, ophthalmologic history, tonometry, and central corneal pachymetry. The comparison of the values obtained by both devices and the effect of central corneal thickness (CCT) on tonometry were analyzed using EpiDataAnalysis V2.2.2.183 software. RESULTS We examined 318 eyes of 159 patients whose mean age was 40±12.57 years, range 16 to 82 years. The gender ratio was 1. A past ophthalmologic history was noted in 79.2% of patients. The mean IOP by Goldmann applanation tonometry was 12.75±3.17mmHg, and that by non-contact air-puff tonometry was 13.83±3.80mmHg. The mean central corneal thickness was 530.50±32.61μm. The difference between IOP measured by non-contact tonometry and that measured by contact tonometry was statistically significant, with P=0.00. There was no statistically significant relationship between central corneal pachymetry and contact tonometry (P=0.80). However, there was a statistically significant relationship between non-contact tonometry and central pachymetry (P=0.00). The values obtained with the air-puff tonometer are more affected by central corneal thickness. CONCLUSION The values obtained by Goldmann applanation tonometry are not equivalent to those obtained by non-contact air-puff tonopachymetry.
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Affiliation(s)
- A C Kouassi Rebours
- Service d'ophtalmologie, université Félix-Houphouet-Boigny, CHU de Cocody, Abidjan, Côte d'Ivoire.
| | - F X Kouassi
- Service d'ophtalmologie, université Félix-Houphouet-Boigny, CHU de Cocody, Abidjan, Côte d'Ivoire
| | - M Soumahoro
- Service d'ophtalmologie, université Félix-Houphouet-Boigny, CHU de Cocody, Abidjan, Côte d'Ivoire
| | | | - K R A Alla Ngoran Siméon
- Service d'ophtalmologie, université Félix-Houphouet-Boigny, CHU de Cocody, Abidjan, Côte d'Ivoire
| | - R P Agbohoun
- Service d'ophtalmologie, université Félix-Houphouet-Boigny, CHU de Cocody, Abidjan, Côte d'Ivoire
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Uzlu D, Akyol N, Türk A, Oruç Y. A comparison of three different tonometric methods in the measurement of intraocular pressure in the pediatric age group. Int Ophthalmol 2020; 40:1999-2005. [DOI: 10.1007/s10792-020-01375-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 04/10/2020] [Indexed: 10/24/2022]
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Velis G, Kavitha S, Zebardast N, Sengupta S, Venkatesh R. Comparison of the corrected intraocular pressure by tonopachy with that of Goldmann applanation tonometry in normal and glaucomatous patients. Indian J Ophthalmol 2020; 68:620-626. [PMID: 32174582 PMCID: PMC7210839 DOI: 10.4103/ijo.ijo_570_19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Purpose: To compare corrected intraocular pressure (IOP) by tonopachy with that of Goldmann applanation tonometry (GAT) in normal and glaucomatous patients. Methods: In this cross-sectional study, IOP and central corneal thickness (CCT) were measured in 426 eyes (213 normal eyes and 213 glaucomatous eyes) of 426 patients by tonopachy followed by GAT and ultrasound pachymetry. IOP was corrected for CCT by in-built formula in tonopachy and Ehlers correction factor for Goldmann tonometer. Limits of agreements were assessed using Bland–Altman plots. Intraclass correlation coefficient was calculated to estimate the absolute agreement between single and average measurements of IOP and CCT of tonopachy with that of Goldmann tonometer and ultrasound pachymetry respectively. Results: Mean corrected IOP measured with tonopachy and GAT in glaucomatous eyes was 17.63 ± 5.04 mmHg and 19.42 ± 5.83 mmHg, and in controls it was 13.4 ± 2.5 mmHg and 16.2 ± 3.1 mmHg, respectively. Limits of agreement ranged from –4.63 to +9.25 mmHg for total population (mean = 2.31), ˗6.01 to +9.59 mmHg (mean = 1.79) for glaucoma group and ˗2.99 to +8.65 mmHg (mean = 2.83) for controls. Intraclass correlation coefficient for IOP measurement between tonopachy and Goldmann tonometer was 0.84 for total population, 0.85 for glaucoma group, and 0.63 for controls, respectively. Conclusion: Corrected IOP obtained by tonopachy showed moderate agreement with GAT and it is more in glaucoma patients than controls. Thus, tonopachy can be used as a screening tool, but cannot replace GAT.
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Affiliation(s)
- Girish Velis
- Department of Glaucoma, Aravind Eye Hospital, Pondicherry, India
| | | | - Nazlee Zebardast
- Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
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Bang SP, Lee CE, Kim YC. Comparison of intraocular pressure as measured by three different non-contact tonometers and goldmann applanation tonometer for non-glaucomatous subjects. BMC Ophthalmol 2017; 17:199. [PMID: 29096616 PMCID: PMC5668971 DOI: 10.1186/s12886-017-0593-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 10/27/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND To compare the measurement of intraocular pressure (IOP) among the three different non-contact tonometers (NCT) and the Goldmann applanation tonometer (GAT) for non-glaucomatous subjects. METHODS In 52 eyes of 52 non-glaucomatous subjects, IOP was measured sequentially with the Canon TX-20P, the Nidek NT-530P, the Topcon CT-1P, and the GAT at the same time. We evaluated the IOP-measurement agreement among the tonometers as well as the factors affecting the measurements. RESULTS A significant positive correlation was shown between the IOP values obtained with GAT and each NCT. The Canon TX-20P showed statistically the most significant agreement with the GAT (ICC 0.906, 95% CI 0.837-0.946). In an analysis of the Bland-Altman plots, the Canon TX-20P also showed the largest mean bias (1.38 mmHg) but the narrowest limits of agreement (LoA) (95% LoA; ± 3.43 mmHg). The Topcon CT-1P showed the smallest mean bias (0.48 mmHg) but the widest LoA (95% LoA; ± 4.16 mmHg). The Topcon CT-1P and Nidek NT-530P both showed a significantly positive correlation between increasing central corneal thickness (CCT) and increasing IOP. CONCLUSION There was a statistically significant correlation between each of the three different NCT and the GAT measurements. IOP measured with the Canon TX-20P and Topcon CT-1P tended to be higher, and with the Nidek NT-530P lower, than with the GAT. Practitioners need to know the properties of their own NCTs and their respective measurement tendencies.
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Affiliation(s)
- Seung Pil Bang
- Department of Ophthalmology, Keimyung University School of Medicine, Dongsan Medical Center, #56, Dalseong-ro, Jung-gu, Daegu, 41931, South Korea
| | - Chong Eun Lee
- Department of Ophthalmology, Keimyung University School of Medicine, Dongsan Medical Center, #56, Dalseong-ro, Jung-gu, Daegu, 41931, South Korea
| | - Yu Cheol Kim
- Department of Ophthalmology, Keimyung University School of Medicine, Dongsan Medical Center, #56, Dalseong-ro, Jung-gu, Daegu, 41931, South Korea.
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Hahn IK, Kim JY, Kim MJ, Tchah H, Moon CH. Validity of Tono-pachymetry for Measuring Corrected Intraocular Pressure in Non-surgical and Post-photorefractive Keratectomy Eyes. KOREAN JOURNAL OF OPHTHALMOLOGY 2017; 31:44-51. [PMID: 28243023 PMCID: PMC5327174 DOI: 10.3341/kjo.2017.31.1.44] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 11/29/2016] [Indexed: 11/23/2022] Open
Abstract
Purpose To assess the validity of central corneal thickness (CCT) and corrected intraocular pressure (IOP) values obtained by tono-pachymetry in non-surgical and post-photorefractive keratectomy (PRK) eyes. Methods For the study, 108 young healthy participants and 108 patients who had PRK were enrolled. Measurements were randomly performed by tono-pachymetry, ultrasonic (US) pachymetry, and Goldmann applanation tonometry (GAT). CCT measurement by tono-pachymetry was compared to that of US pachymetry. The corrected IOP value obtained by tono-pachymetry was compared to that obtained by US pachymetry and GAT. The corrected IOP from US pachymetry and GAT was calculated using the identical compensation formula built into the tono-pachymetry. Bland-Altman plot and paired t-test were conducted to evaluate the between-method agreements. Results The mean CCT measurement using tono-pachymetry was significantly greater by 7.3 µm in non-surgical eyes (p < 0.001) and 17.8 µm in post-PRK eyes (p < 0.001) compared with US pachymetry. Differences were significant in both Bland-Altman plotand paired t-test. The mean difference of corrected IOP values obtained by tono-pachymetry and calculated from measurements by US pachymetry and GAT was 0.33 ± 0.87 mmHg in non-surgical eyes and 0.57 ± 1.08 mmHg in post-PRK eyes. The differences in the Bland-Altman plot were not significant. Conclusions The CCT measurement determined using tono-pachymetrywas significantly thicker than that of US pachymetry. The difference in CCT was greater in post-PRK eyes than in non-surgical eyes. However, the corrected IOP value obtained by tono-pachymetry showed reasonable agreement with that calculated from US pachymetry and GAT measurements.
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Affiliation(s)
- In Kyun Hahn
- Department of Ophthalmology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jae Yong Kim
- Department of Ophthalmology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Myoung Joon Kim
- Department of Ophthalmology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Hungwon Tchah
- Department of Ophthalmology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Chan Hee Moon
- Department of Ophthalmology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.; Department of Ophthalmology, Aerospace Medical Center, Republic of Korea Air Force, Cheongju, Korea
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Correlation analysis between central corneal thickness and intraocular pressure in juveniles in Northern China: the Jinan city eye study. PLoS One 2014; 9:e104842. [PMID: 25148520 PMCID: PMC4141688 DOI: 10.1371/journal.pone.0104842] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 07/15/2014] [Indexed: 12/27/2022] Open
Abstract
Purpose To determine the distributions and relation of central corneal thickness (CCT) and intraocular pressure (IOP) by NT-530P in Chinese juveniles, and the effect of gender, age, height, weight and refractive errors on the CTT and IOP. Methods CCT and IOP of 982 eyes in 514 juveniles aged from 7 to 18 years were measured with NT-530P. Multi-linear regression and ANOVA analysis were used to analyze the relation of CCT and IOP, and the effect of gender, age, height, weight, refractive condition on CCT and IOP respectively. Results The mean CCT and IOP were 554.19±35.46 µm and 15.31±2.57 mmHg. There were significant correlations between the CCT and IOP values. Linear regression analysis revealed a positive correlation between CCT and IOP (r = 0.44, P<0.05). Linear regression equation: IOP = −2.35+0.032CCT, which means the IOP will increase 0.32 mm Hg for every 10-µm increase in CCT. The mean of Corrected IOP (CIOP) was 15.32±2.38 mmHg and had no relation with CCT. There was a negative correlation between refraction degree and CCT (P<0.05), but no correlation between refraction degree and IOP. Multi-linear regression model revealed that the height, weight, age and gender have no effect on the distribution of CCT and IOP respectively. Conclusions There is a 0.32 mmHg increase in IOP for every 10-µm increase in CCT. The height, weight, age and gender has no effect on the distribution of CCT and IOP. CCT will become thinner with myopia diopters increases in juveniles. The measurement of CCT is helpful in evaluating the actual IOP correctly.
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Paschalis EI, Cade F, Melki S, Pasquale LR, Dohlman CH, Ciolino JB. Reliable intraocular pressure measurement using automated radio-wave telemetry. Clin Ophthalmol 2014; 8:177-85. [PMID: 24531415 PMCID: PMC3891580 DOI: 10.2147/opth.s54753] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
PURPOSE To present an autonomous intraocular pressure (IOP) measurement technique using a wireless implantable transducer (WIT) and a motion sensor. METHODS The WIT optical aid was implanted within the ciliary sulcus of a normotensive rabbit eye after extracapsular clear lens extraction. An autonomous wireless data system (AWDS) comprising of a WIT and an external antenna aided by a motion sensor provided continuous IOP readings. The sensitivity of the technique was determined by the ability to detect IOP changes resulting from the administration of latanoprost 0.005% or dorzolamide 2%, while the reliability was determined by the agreement between baseline and vehicle (saline) IOP. RESULTS On average, 12 diurnal and 205 nocturnal IOP measurements were performed with latanoprost, and 26 diurnal and 205 nocturnal measurements with dorzolamide. No difference was found between mean baseline IOP (13.08±2.2 mmHg) and mean vehicle IOP (13.27±2.1 mmHg) (P=0.45), suggesting good measurement reliability. Both antiglaucoma medications caused significant IOP reduction compared to baseline; latanoprost reduced mean IOP by 10% (1.3±3.54 mmHg; P<0.001), and dorzolamide by 5% (0.62±2.22 mmHg; P<0.001). Use of latanoprost resulted in an overall twofold higher IOP reduction compared to dorzolamide (P<0.001). Repeatability was ±1.8 mmHg, assessed by the variability of consecutive IOP measurements performed in a short period of time (≤1 minute), during which the IOP is not expected to change. CONCLUSION IOP measurements in conscious rabbits obtained without the need for human interactions using the AWDS are feasible and provide reproducible results.
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Affiliation(s)
| | - Fabiano Cade
- Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Samir Melki
- Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Louis R Pasquale
- Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Claes H Dohlman
- Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Joseph B Ciolino
- Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
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