J Otolaryngol Ophthalmol Shandong Univ ›› 2017, Vol. 31 ›› Issue (2): 99-103.doi: 10.6040/j.issn.1673-3770.0.2016.458

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Influencing factors of tonometry of intraocular pressure following LASIK.

  

  1. Department of Ophthalmology, The Second Affiliated Hospital, University of South China, Hengyang 421001, Hunan, China
  • Received:2016-11-03 Online:2017-04-16 Published:2017-04-16

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Abstract: Objective To establish and validate the regression formula of intraocular pressure(IOP)by analyzing the influencing factors of IOP following laser assisted in situ keratomileusis(LASIK). Methods A prospective case study was performed on 235 myopia patients receiving LASIK. After self-contrast of randomized paired design, the influencing factors of IOP noncontact tonometer(IOPNCT)were analyzed. The multiple regression formula to forecast the changes of IOPNCT after LASIK was established and verified. Results The preoperative IOPNCT was not related to gender, dominant eye, age or keratometry of the patients(P>0.05), but positively related to the central corneal thickness(CCT)and absolute value of spherical equivalent. The IOPNCT changes after LASIK(△IOPNCT)were not related to age, keratometry or stroma bed thickness of the patient(P>0.05), but positively related to the preoperative IOPNCT, CCT, ablation depth, ablation rate(AR)and absolute value of spherical equivalent. The multiple linear regression formula of the IOPNCT changes after LASIK was: △IOPNCT = IOPNCT-preop×0.552 + AR×0.158-6.219(R2=0.561, P<0.01). After Verification by practical cases, there was no statistically significant difference between the estimated values and measured values of the IOPNCT changes after LASIK(t=-0.129, P=0.897). Conclusion The IOPNCT of pre-LASIK is not related to gender, dominant eye, age or keratometry of the patient, but positively related to the central corneal thickness and absolute value of spherical equivalent. The △IOPNCT is not related to age, keratometry or stroma bed thickness of the patient, but positively related to the IOPNCT of pre-LASIK, central corneal thickness, absolute value of spherical equivalent, ablation depth and rate. The values of △IOPNCT can be estimated by the regression formula.

Key words: Myopia, Intraocular pressure, Laser assisted in situ keratomileusis, Regression analysis

CLC Number: 

  • R77
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