J Ophthalmol. 2018 Sep 16;2018:8072140. doi: 10.1155/2018/8072140. eCollection 2018.
The Effect of Strabismus Muscle Surgery on Corneal Biomechanics.
Journal of ophthalmology
Heba A El Gendy, Noha M Khalil, Iman M Eissa, Shireen Ma Shousha
Affiliations
Affiliations
- Professor of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, Egypt.
- Associate Professor of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, Egypt.
- Lecturer of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, Egypt.
PMID: 30305960
PMCID: PMC6165609 DOI: 10.1155/2018/8072140
Abstract
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 (
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).
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