The Effect of Strabismus Muscle Surgery on Corneal Biomechanics
Purpose. Studying the early effect of different extraocular muscle (EOM) surgeries on corneal biomechanics. Subjects and methods. This is a prospective, nonrandomized, interventional study, in which 42 eyes of 29 candidates for EOM surgery for strabismus correction at Cairo university hospitals, age...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Journal of Ophthalmology |
| Online Access: | http://dx.doi.org/10.1155/2018/8072140 |
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| author | Heba A. El Gendy Noha M. Khalil Iman M. Eissa Shireen MA. Shousha |
| author_facet | Heba A. El Gendy Noha M. Khalil Iman M. Eissa Shireen MA. Shousha |
| author_sort | Heba A. El Gendy |
| collection | DOAJ |
| description | Purpose. Studying the early effect of different extraocular muscle (EOM) surgeries on corneal biomechanics. Subjects and methods. This is a prospective, nonrandomized, interventional study, in which 42 eyes of 29 candidates for EOM surgery for strabismus correction at Cairo university hospitals, aged 14–37 years, were recruited. All participants had measuring of the visual acuity, refraction (spherical equivalent (SE)), assessment of the EOM motility and muscle balance, sensory evaluation, fundus examination, and assessing the ocular biomechanics using the Ocular response analyzer (ORA, Reichert, INC., Depew, NY) noting the corneal hysteresis (CH) and corneal resistance factor (CRF) preoperatively. Same patients were reassessed using ORA 4 weeks postoperatively following a different standard EOM surgery (recti weakening/strengthening and inferior oblique weakening either (graded recession) according to the surgical indication, and ∆CH and ∆CRF were calculated, each is the preoperative − the postoperative value. Results. ∆CH and ∆CRF = −0.78 ± 1.56 and −0.72 ± 2.15, respectively, and a highly significant difference was found between each of the pre- and postoperative CH and CRF (p<0.001). 18 eyes had single EOM surgery, while 24 had multiple (2 or 3) EOM surgery; ∆CH in the single group = −1.28 ± 1.5, and ∆CH in the multiple group = 0.4 ± 1.49 (p=0.07). 23 eyes had EOM weakening surgery, while 18 had combined weakening and strengthening EOM surgery: ∆CH in the weakening group = −1.24 ± 1.77 and ∆CH in combined group = −0.26 ± 1.07 (p=0.04). A nonsignificant difference was found for ∆CRF (p=0.53). Conclusion. A different EOM surgery has an early tendency for increase of the postoperative CH specially for muscle weakening procedures (recti recession/inferior oblique muscle weakening). |
| format | Article |
| id | doaj-art-8a02715f4d694404ae8bd6d2c8e044dc |
| institution | Kabale University |
| issn | 2090-004X 2090-0058 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Ophthalmology |
| spelling | doaj-art-8a02715f4d694404ae8bd6d2c8e044dc2025-08-20T03:37:51ZengWileyJournal of Ophthalmology2090-004X2090-00582018-01-01201810.1155/2018/80721408072140The Effect of Strabismus Muscle Surgery on Corneal BiomechanicsHeba A. El Gendy0Noha M. Khalil1Iman M. Eissa2Shireen MA. Shousha3Professor of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, EgyptAssociate Professor of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, EgyptAssociate Professor of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, EgyptLecturer of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, EgyptPurpose. Studying the early effect of different extraocular muscle (EOM) surgeries on corneal biomechanics. Subjects and methods. This is a prospective, nonrandomized, interventional study, in which 42 eyes of 29 candidates for EOM surgery for strabismus correction at Cairo university hospitals, aged 14–37 years, were recruited. All participants had measuring of the visual acuity, refraction (spherical equivalent (SE)), assessment of the EOM motility and muscle balance, sensory evaluation, fundus examination, and assessing the ocular biomechanics using the Ocular response analyzer (ORA, Reichert, INC., Depew, NY) noting the corneal hysteresis (CH) and corneal resistance factor (CRF) preoperatively. Same patients were reassessed using ORA 4 weeks postoperatively following a different standard EOM surgery (recti weakening/strengthening and inferior oblique weakening either (graded recession) according to the surgical indication, and ∆CH and ∆CRF were calculated, each is the preoperative − the postoperative value. Results. ∆CH and ∆CRF = −0.78 ± 1.56 and −0.72 ± 2.15, respectively, and a highly significant difference was found between each of the pre- and postoperative CH and CRF (p<0.001). 18 eyes had single EOM surgery, while 24 had multiple (2 or 3) EOM surgery; ∆CH in the single group = −1.28 ± 1.5, and ∆CH in the multiple group = 0.4 ± 1.49 (p=0.07). 23 eyes had EOM weakening surgery, while 18 had combined weakening and strengthening EOM surgery: ∆CH in the weakening group = −1.24 ± 1.77 and ∆CH in combined group = −0.26 ± 1.07 (p=0.04). A nonsignificant difference was found for ∆CRF (p=0.53). Conclusion. A different EOM surgery has an early tendency for increase of the postoperative CH specially for muscle weakening procedures (recti recession/inferior oblique muscle weakening).http://dx.doi.org/10.1155/2018/8072140 |
| spellingShingle | Heba A. El Gendy Noha M. Khalil Iman M. Eissa Shireen MA. Shousha The Effect of Strabismus Muscle Surgery on Corneal Biomechanics Journal of Ophthalmology |
| title | The Effect of Strabismus Muscle Surgery on Corneal Biomechanics |
| title_full | The Effect of Strabismus Muscle Surgery on Corneal Biomechanics |
| title_fullStr | The Effect of Strabismus Muscle Surgery on Corneal Biomechanics |
| title_full_unstemmed | The Effect of Strabismus Muscle Surgery on Corneal Biomechanics |
| title_short | The Effect of Strabismus Muscle Surgery on Corneal Biomechanics |
| title_sort | effect of strabismus muscle surgery on corneal biomechanics |
| url | http://dx.doi.org/10.1155/2018/8072140 |
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