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KMID : 1159320180200040543
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Korean Journal of Vision Science
2018 Volume.20 No. 4 p.543 ~ p.551
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Correlation between Corneal Ablation Amount and Intraocular Pressure after Corneal Refractive Surgery
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Jung Mi-A
Lee Eun-Hee
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Abstract
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Purpose : The purposes of this study were to evaluate the changes of intraocular pressure according to corneal ablation amount after corneal refractive surgery and the changes of intraocular pressure according to refractive errors before corneal refractive surgery.
Methods : The mean age of adults who underwent LASIK corneal refractive surgery were 37.34 ± 7.42 years, and 108 adults(48 males, 60 females) were participated in this study. Refractive errors, intraocular pressure, and corneal ablation amount were measured using an autorefractor, a noncontact tonometer, and an excimer laser. All test values were considered statistically significant when p<0.05.
Results : The mean intraocular pressure before corneal refractive surgery was 15.08 ± 2.60mmHg in males and 14.16 ± 2.67mmHg in females. The decrease of intraocular pressure after corneal refractive surgery were 4.22mmHg in males and 3.61mmHg in females. Spherical equivalent power were -3.89 ± 2.17D in males and -4.45 ± 2.92D in females before corneal refractive surgery, and -0.10 ± 0.46D in males and -0.04 ± 0.46D in females after corneal refractive surgery. The corneal ablation amount after corneal refractive surgery were statistically significant, with 53.95㎛ in males and 61.26㎛ in females. There was significant correlation between corneal ablation amount and decrease of intaocluar pressure(r=0.2299, p<0.001). As the growth of corneal ablation amount in males, the decrease of intraocular pressure was significantly increased. As the growth of refractive error, the amount of decrease in intraocular pressure was also significant. The decrease of intraocualr pressure were 3.04 ± 2.18mmHg in low refractive error, 4.10 ± 2.16 mmHg in middle refractive error, and 4.65 ± 3.29 mmHg in high refractive error.
Conclusion : We found that intraocular pressure decreased after corneal refractive surgery by noncontact tonometer and the change of intraocular pressure which is an important index for glaucoma diagnosis, may affect the judgment of eye disease. We think that a preliminary questionnaire whether corneal refractive surgery is necessary for the measurement of intraocular pressure.
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KEYWORD
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Corneal refractive surgery, Corneal ablation amount, Intraocular pressure, Refractive error, Glaucoma
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