Comparison of Pre and Post LASIK Corneal Thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular Microscopy, Ultrasonic Pachymetry
Background : To measure corneal thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular microscopy, Ultrasonic pachymetry Pre and Post LASIK and to compare the four techniques. Materials and Methods: A prospective study was conducted at a tertiary care eye hospital to compare c...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2015-01-01
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| Series: | Delhi Journal of Ophthalmology |
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| Online Access: | https://journals.lww.com/10.7869/djo.100 |
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| author | Metu Rajput Charu Tandon Uma Sridhar |
| author_facet | Metu Rajput Charu Tandon Uma Sridhar |
| author_sort | Metu Rajput |
| collection | DOAJ |
| description | Background :
To measure corneal thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular microscopy, Ultrasonic pachymetry Pre and Post LASIK and to compare the four techniques.
Materials and Methods:
A prospective study was conducted at a tertiary care eye hospital to compare corneal thickness by orbscan, anterior segment optical coherence tomography, specular microscopy, ultrasonic pachymetry pre and post LASIK in 50 subjects (100 eyes).
Results:
Baseline mean CCT measured with ORBSCAN was 556.73 ± 17.07, with ULTPACH was 544.13 ± 16.94, with SPEC was 544.55 ± 18.98 and with ASOCT was 544.61 ± 16.39. There was statistically significant difference in mean CCT among orbscan and the other three methods (P <0.001) preoperatively. On postoperative day 7, mean CCT measured with ORBSCAN was 456.60 ± 30.41, with ULTPACH was 475.02 ± 22.26, with SPEC was 472.06 ± 22.99, and with ASOCT was 475.75 ± 24.17. There was statistically significant difference in mean CCT among orbscan, and the other three techniques namely, ultrasonic pachymetry, specular microscopy, anterior segment optical coherence tomography on postoperative day 7 (p <0.001). On postoperative day 30, mean CCT measured with ORBSCAN was 459.32 ± 27.40, with ULTPACH was 480.95 ± 24.88, with SPEC was 475.31 ± 23.20, and with ASOCT was 479.12 ± 23.83. This also showed statistically significant difference in mean CCT between orbscan, and the other three methods.(P <0.001).
Conclusion:
Ultrasonic pachymetry is considered as the gold standard method of measuring CCT and it compares favourably with specular microscopy and AS OCT. Orbscan has a tendency to overestimate pre LASIK and underestimate post LASIK. |
| format | Article |
| id | doaj-art-c20683691b7f4c65b16b1d5b50e6d963 |
| institution | Kabale University |
| issn | 0972-0200 2454-2784 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Delhi Journal of Ophthalmology |
| spelling | doaj-art-c20683691b7f4c65b16b1d5b50e6d9632025-08-20T03:52:28ZengWolters Kluwer Medknow PublicationsDelhi Journal of Ophthalmology0972-02002454-27842015-01-0125316617010.7869/djo.100Comparison of Pre and Post LASIK Corneal Thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular Microscopy, Ultrasonic PachymetryMetu RajputCharu TandonUma SridharBackground : To measure corneal thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular microscopy, Ultrasonic pachymetry Pre and Post LASIK and to compare the four techniques. Materials and Methods: A prospective study was conducted at a tertiary care eye hospital to compare corneal thickness by orbscan, anterior segment optical coherence tomography, specular microscopy, ultrasonic pachymetry pre and post LASIK in 50 subjects (100 eyes). Results: Baseline mean CCT measured with ORBSCAN was 556.73 ± 17.07, with ULTPACH was 544.13 ± 16.94, with SPEC was 544.55 ± 18.98 and with ASOCT was 544.61 ± 16.39. There was statistically significant difference in mean CCT among orbscan and the other three methods (P <0.001) preoperatively. On postoperative day 7, mean CCT measured with ORBSCAN was 456.60 ± 30.41, with ULTPACH was 475.02 ± 22.26, with SPEC was 472.06 ± 22.99, and with ASOCT was 475.75 ± 24.17. There was statistically significant difference in mean CCT among orbscan, and the other three techniques namely, ultrasonic pachymetry, specular microscopy, anterior segment optical coherence tomography on postoperative day 7 (p <0.001). On postoperative day 30, mean CCT measured with ORBSCAN was 459.32 ± 27.40, with ULTPACH was 480.95 ± 24.88, with SPEC was 475.31 ± 23.20, and with ASOCT was 479.12 ± 23.83. This also showed statistically significant difference in mean CCT between orbscan, and the other three methods.(P <0.001). Conclusion: Ultrasonic pachymetry is considered as the gold standard method of measuring CCT and it compares favourably with specular microscopy and AS OCT. Orbscan has a tendency to overestimate pre LASIK and underestimate post LASIK.https://journals.lww.com/10.7869/djo.100pachymetrylasikorbscanasoct |
| spellingShingle | Metu Rajput Charu Tandon Uma Sridhar Comparison of Pre and Post LASIK Corneal Thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular Microscopy, Ultrasonic Pachymetry Delhi Journal of Ophthalmology pachymetry lasik orbscan asoct |
| title | Comparison of Pre and Post LASIK Corneal Thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular Microscopy, Ultrasonic Pachymetry |
| title_full | Comparison of Pre and Post LASIK Corneal Thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular Microscopy, Ultrasonic Pachymetry |
| title_fullStr | Comparison of Pre and Post LASIK Corneal Thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular Microscopy, Ultrasonic Pachymetry |
| title_full_unstemmed | Comparison of Pre and Post LASIK Corneal Thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular Microscopy, Ultrasonic Pachymetry |
| title_short | Comparison of Pre and Post LASIK Corneal Thickness by Orbscan, Anterior Segment Optical Coherence Tomography, Specular Microscopy, Ultrasonic Pachymetry |
| title_sort | comparison of pre and post lasik corneal thickness by orbscan anterior segment optical coherence tomography specular microscopy ultrasonic pachymetry |
| topic | pachymetry lasik orbscan asoct |
| url | https://journals.lww.com/10.7869/djo.100 |
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