Sirius眼前节分析仪测量飞秒激光制瓣LASIK术后角膜后表面的变化

doi:DOI:10.3760/cma.j.issn.1674-845X.2016.06.010

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Abstract

Objective To investigate changes in posterior corneal curvature (ΔK) in post-femtosecond LASIK patients using Sirius topography, and to analyze its relationship with ablation percentage (AD/CT) and depth (AD), residual bed thickness RBT, and spherical equivalent (SE). Methods This was a prospective nonrandomized study. Seventy-three post-femtosecond LASIK patients were recruited for this study (146 eyes; aged 19 to 36 years, mean 25.7±5.1 years; spherical equivalent -10.25 to -4.50 D, mean -6.95±1.97 D). Posterior corneal curvature was measured by Sirius topography pre-surgery and at 1 month post-surgery. The correlations between ΔK and AD/CT, AD, RBT, and SE were analyzed. Results One month post-surgery, the posterior corneal curvatures of the 3 mm and 5 mm diameter range were higher than those for pre-surgery (t=3.58, 3.36; P<0.01). Univariate regression analyses showed that the ΔK3 mm, ΔK5 mm, and ΔK7 mm were positively correlated with their AD/CT (r=0.845, 0.833, 0.753; P<0.01) and AD (r=0.725, 0.727, 0.603; P<0.05). The ΔK3 mm, ΔK5 mm, and ΔK7 mm were negatively correlated with the SE (r=-0.762, -0.756, -0.674; P<0.05) and RBT (r=-0.784, -0.733, -0.864; P<0.01). A stepwise multiple linear analysis was used to determine the factors associated with ΔK. AD/CT and RBT were the factors that influenced ΔK3 mm (β=2.048, -0.002; 95%CI: 0.489~3.607, -0.003~0; P<0.1); AD/CT was the factor that influenced ΔK5 mm (β=2.005; 95%CI: 1.068~3.942; P<0.1); RBT and SE were the factors that influenced ΔK7 mm (β=-0.003, -0.325; 95%CI: -0.004~0.002, -0.786~0.428; P<0.1). Conclusion This research shows that the corneal posterior surface has a slightly forward shift in post-femtosecond LASIK patients. The ΔK is related to ablation percentage and depth, spherical equivalent, and residual bed thickness.

Key words： Corneal topography Femtosecond laser Keratomileusis, laser in situ Posterior corneal curvature

Received: 01 February 2016

Corresponding Authors: Wang Shiming, Email: wsm1981711@163.com

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	Wang Shiming
	Li Xiaoping
	Gu Lindan
	Fu Jiangwei

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Wang Shiming,Li Xiaoping,Gu Lindan等. The changes in posterior corneal curvature measured by Sirius topography in post-femtosecond LASIK patients[J]. Chinese Journal of Optometry Ophthalmology and Visual science, 2016, 18(6): 368-372.

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http://www.cjoovs.com/EN/DOI:10.3760/cma.j.issn.1674-845X.2016.06.010 OR http://www.cjoovs.com/EN/Y2016/V18/I6/368

[1]	Seiler T, Koufala K, Richter G. Iatrogenic keratectasia after laser in situ keratomileusis[J]. J Refract Surg,1998,14(3):312-317.
[2]	姜宏钧,谢培英. 圆锥角膜的角膜地形图分析[J]. 中华眼科杂志,2006,42(3):231-235. DOI:10.3760/j:issn:0412-4081.2006.03.010.
[3]	Galletti JD, Ruise?觡or Vázquez PR, Minguez N, et al. Corneal asymmetry analysis by pentacam scheimpflug tomography for keratoconus diagnosis[J]. J Refract Surg,2015,31(2):116-123. DOI:10.3928/1081597X-20150122-07.
[4]	Ciolino JB, Khachikian SS, Cortese MJ, et al. Long-term stability of the posterior cornea after laser in situ keratomileusis[J]. J Cataract Refract Surg,2007,33(8):1366-1370.
[5]	施彦,俞存. Sirius角膜地形图仪测量LASIK和LASEK术后角膜后表面的研究[J]. 中华眼视光学与视觉科学杂志,2014,16(2): 118-121. DOI:10.3760/cma.j.issn.1674-845X.2014.02.014.
[6]	张青松. 运用Pentacam对LASEK与LASIK术后角膜后表面高度变化的观察[J]. 国际眼科杂志,2014,14(5):852-853. DOI:10.3980/j.issn.1672-5123.2014.05.18.
[7]	陈跃国. 飞秒激光制瓣技术的优势与相关并发症[J]. 中华眼视光学与视觉科学杂志,2013,15(7):385-387. DOI:10.3760/cma.j.issn.1674-845X.2013.07.001.
[8]	Kanellopoulos AJ, Asimellis G. FS200 femtosecond laser LASIK flap digital analysis parameter evaluation: comparing two different types of patient interface applanation cones[J]. Clin Ophthalmol,2013,7:1103-1108. DOI:10.2147/OPTH.S43396. Epub 2013 Jun 10.
[9]	杜之渝,吴宁玲,张大勇,等. 准分子激光原位角膜磨镶术后角膜基质床厚度安全值分析[J]. 中华眼科杂志,2004,40(11):741-744. DOI:10.3760/j:issn:0412-4081.2004.11.006.
	[10] Seitz B, Torres F, Langenbucher A, et al. Posterior corneal curvature changes after myopic laser in situ keratomileusis[J]. Ophthalmology,2001,108(4):666-672.
	[11] Kamiya K, Oshika T, Amano S, et al. Influence of excimer laser photorefractive keratectomy on the posterior corneal surface[J]. J Cataract Refract Surg,2000,26(6):867-871.
	[12] Naroo SA, Charman WN. Changes in posterior corneal curvature after photorefractive keratectomy[J]. J Cataract Refract Surg,2000, 26(6):872-878.
	[13] Wang Z, Chen J, Yang B. Posterior corneal surface topographic changes after laser in situ keratomileusis are related to residual corneal bed thickness[J]. Ophthalmology,1999,106(2):406-409.
	[14] Baek T, Lee K, Kagaya F, et al. Amano S. Factors affecting the forward shift of posterior corneal surface after laser in situ keratomileusis[J]. Ophthalmology,2001,108(2):317-320.
	[15] Kim SW, Sun HJ, Chang JH, et al. Anterior segment measurements using Pentacam and Orbscan II 1 to 5 years after refractive surgery[J]. J Refract Surg, 2009,25(12):1091-1097. DOI:10.3928/1081597X-20091117-08.
	[16] Byun YS, Chung SH, Park YG, et al. Posterior corneal curvature assessment after Epi-LASIK for myopia: comparison of Orbscan II and Pentacam imaging[J]. Korean J Ophthalmol,2012,26(1):6-9. DOI:10.3341/kjo.2012.26.1.6. Epub 2012 Jan 14.
	[17] Cheng AC, Rao SK, Lam DS. Accuracy of Orbscan II in the assessment of posterior curvature in patients with myopic LASIK[J]. J Refract Surg,2007,23(7):677-680.
	[18] 刘祖国,张梅,Stephen C,等. 长期配戴角膜接触镜对角膜厚度屈率及表面规则性的影响[J]. 中国实用眼科杂志,2002,20(5):343-346. DOI:10.3760/cma.j.issn.1006-4443.2002.05.008.
	[19] Guirao A. Theoretical elastic response of the cornea to refractive surgery: risk factors for keratectasia[J]. J Refract Surg,2005,21(2):176-185.