Relationships between central and peripheral corneal thickness in different degrees of myopia
Purpose: To analyze the relationship between the central corneal thickness (CCT) and mid-peripheral corneal thickness (PCT) with the degree of myopia [axial length (AL) and spherical equivalent refractive error (SE)]. Methods: 175 right myopic eyes from 175 patients were divided according to the deg...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2014-01-01
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| Series: | Journal of Optometry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1888429613000289 |
| _version_ | 1818160491989565440 |
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| author | Sara Ortiz Laura Mena Ana Rio-San Cristobal Raul Martin |
| author_facet | Sara Ortiz Laura Mena Ana Rio-San Cristobal Raul Martin |
| author_sort | Sara Ortiz |
| collection | DOAJ |
| description | Purpose: To analyze the relationship between the central corneal thickness (CCT) and mid-peripheral corneal thickness (PCT) with the degree of myopia [axial length (AL) and spherical equivalent refractive error (SE)].
Methods: 175 right myopic eyes from 175 patients were divided according to the degree of SE: group #1 (n = 76, <6.00 D), group #2 (n = 72, between 6.00 and 12.00 D) and group #3 (n = 27, >12.00 D). The CCT and PCT (3 mm from the apex to the superior, inferior, nasal and temporal locations) were measured with the Orbscan-II. Relative peripheral index (RPI) was calculated by dividing the PCT by the CCT. The AL was measured with the IOL Master, and the SE was obtained with subjective refraction.
Results: AL was 25.18 ± 1.16 mm, 26.59 ± 1.26 mm and 29.45 ± 2.58 mm and SE was −3.31 ± 1.40 D, −8.32 ± 1.64 D and −16.44 ± 4.48 D for groups #1, #2 and #3, respectively. Non-statistically significant differences in central and peripheral corneal thickness were found between groups (P > 0.05 ANOVA). Non-significant relationship was found between central and peripheral corneal thickness with the AL and SE in the three study groups and in the total sample (r < 0.24; P > 0.05). The RPI values were similar between groups without significant difference between groups (P > 0.05 ANOVA). Linear relationship was found between RPI superior location in group #2 (r = −0.23; P = 0.04) and RPI nasal location in group #3 with the EE (r = 0.41; P = 0.03).
Conclusion: There are no significant differences among low, moderate and extremely myopic eyes related to the CCT and PCT. Corneal thickness is very similar in myopic eyes with small differences that are not clinically relevant to myopic patient management. |
| first_indexed | 2024-12-11T16:02:44Z |
| format | Article |
| id | doaj.art-8050af84eb0243d487b9d92bb161706c |
| institution | Directory Open Access Journal |
| issn | 1888-4296 |
| language | English |
| last_indexed | 2024-12-11T16:02:44Z |
| publishDate | 2014-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Optometry |
| spelling | doaj.art-8050af84eb0243d487b9d92bb161706c2022-12-22T00:59:16ZengElsevierJournal of Optometry1888-42962014-01-0171445010.1016/j.optom.2013.03.005Relationships between central and peripheral corneal thickness in different degrees of myopiaSara Ortiz0Laura Mena1Ana Rio-San Cristobal2Raul Martin3Optometry Research Group, IOBA-Eye Institute, University of Valladolid, Valladolid, SpainOptometry Research Group, IOBA-Eye Institute, University of Valladolid, Valladolid, SpainOptometry Research Group, IOBA-Eye Institute, University of Valladolid, Valladolid, SpainOptometry Research Group, IOBA-Eye Institute, University of Valladolid, Valladolid, SpainPurpose: To analyze the relationship between the central corneal thickness (CCT) and mid-peripheral corneal thickness (PCT) with the degree of myopia [axial length (AL) and spherical equivalent refractive error (SE)]. Methods: 175 right myopic eyes from 175 patients were divided according to the degree of SE: group #1 (n = 76, <6.00 D), group #2 (n = 72, between 6.00 and 12.00 D) and group #3 (n = 27, >12.00 D). The CCT and PCT (3 mm from the apex to the superior, inferior, nasal and temporal locations) were measured with the Orbscan-II. Relative peripheral index (RPI) was calculated by dividing the PCT by the CCT. The AL was measured with the IOL Master, and the SE was obtained with subjective refraction. Results: AL was 25.18 ± 1.16 mm, 26.59 ± 1.26 mm and 29.45 ± 2.58 mm and SE was −3.31 ± 1.40 D, −8.32 ± 1.64 D and −16.44 ± 4.48 D for groups #1, #2 and #3, respectively. Non-statistically significant differences in central and peripheral corneal thickness were found between groups (P > 0.05 ANOVA). Non-significant relationship was found between central and peripheral corneal thickness with the AL and SE in the three study groups and in the total sample (r < 0.24; P > 0.05). The RPI values were similar between groups without significant difference between groups (P > 0.05 ANOVA). Linear relationship was found between RPI superior location in group #2 (r = −0.23; P = 0.04) and RPI nasal location in group #3 with the EE (r = 0.41; P = 0.03). Conclusion: There are no significant differences among low, moderate and extremely myopic eyes related to the CCT and PCT. Corneal thickness is very similar in myopic eyes with small differences that are not clinically relevant to myopic patient management.http://www.sciencedirect.com/science/article/pii/S1888429613000289Central corneal thicknessPeripheral corneal thicknessMyopiaAxial lengthRelative peripheral index |
| spellingShingle | Sara Ortiz Laura Mena Ana Rio-San Cristobal Raul Martin Relationships between central and peripheral corneal thickness in different degrees of myopia Journal of Optometry Central corneal thickness Peripheral corneal thickness Myopia Axial length Relative peripheral index |
| title | Relationships between central and peripheral corneal thickness in different degrees of myopia |
| title_full | Relationships between central and peripheral corneal thickness in different degrees of myopia |
| title_fullStr | Relationships between central and peripheral corneal thickness in different degrees of myopia |
| title_full_unstemmed | Relationships between central and peripheral corneal thickness in different degrees of myopia |
| title_short | Relationships between central and peripheral corneal thickness in different degrees of myopia |
| title_sort | relationships between central and peripheral corneal thickness in different degrees of myopia |
| topic | Central corneal thickness Peripheral corneal thickness Myopia Axial length Relative peripheral index |
| url | http://www.sciencedirect.com/science/article/pii/S1888429613000289 |
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