Corneal irregular astigmatism after laser in situ keratomileusis for myopia

Baek, Tae Min; Lee, Kyung Hun; Tomidokoro, Atsuo; Oshika, Tetsuro

doi:10.1136/bjo.85.5.534

Cited by 27 publications

(14 citation statements)

References 23 publications

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“…3,16,17 Similarly, in this study, the post/preoperative ratio of asymmetry was significantly correlated with the achieved change in refraction.…”

Section: Discussionsupporting

confidence: 52%

“…1,2 Conventional myopic LASIK, however, increases irregular astigmatism, 3 which might be a cause of decreased contrast sensitivity and glare disability after surgery. [4][5][6][7] Our previous study indicated that corneal irregular astigmatism after photorefractive keratectomy (PRK) significantly influences contrast sensitivity.…”

mentioning

confidence: 99%

“…Fourier series harmonic analysis of videokeratography data [9][10][11][12] facilitates quantitative assessment of the changes in irregular astigmatism after various procedures, including myopic LASIK, 3 myopic PRK, 8 cataract surgery, 13 and suture removal after keratoplasty. 14 In this study, we used Fourier analysis of videokeratography data to quantitatively assess changes in corneal irregular astigmatism after hyperopic LASIK.…”

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confidence: 99%

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Corneal Irregular Astigmatism After Hyperopic Laser In Situ Keratomileusis

Amano¹,

Nanba²,

Hamada³

et al. 2005

Cornea

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“…3,16,17 Similarly, in this study, the post/preoperative ratio of asymmetry was significantly correlated with the achieved change in refraction.…”

Section: Discussionsupporting

confidence: 52%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Corneal Irregular Astigmatism After Hyperopic Laser In Situ Keratomileusis

Amano¹,

Nanba²,

Hamada³

et al. 2005

Cornea

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show abstract

“…[83][84][85] Orbscan has had a significant effect on the assessment of refractive surgical techniques, from analysis of the effect of intracorneal rings 86,87 and planning wedge resection post-PKP 88 to the development of several custom ablation techniques using anterior elevation topography. [89][90][91] Further application of Orbscan has related anterior topographic asymmetry to the depth of ablation 92 ; however, the posterior surface of the cornea does not appear to develop distortion. 35 The implementation of a rigorous Orbscan screening protocol Change in height above best-fit sphere may reduce the low incidence of severe, detrimental keratectasia after laser refractive surgery.…”

Section: Miscellaneous Applicationsmentioning

confidence: 98%

Orbscan computerized topography: Attributes, applications, and limitations

Cairns

McGhee

2005

Journal of Cataract and Refractive Surgery

212

134

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An extensive electronic search was undertaken in January 2004 to identify all relevant peer-reviewed publications on Orbscan slit-scanning/Placido computerized topography. Ninety-one publications were identified. These address elevation topography and best-fit sphere, accuracy and repeatability of anterior and posterior corneal elevation and keratometric maps, comparison of Orbscan-acquired data and Placido-based computerized videokeratography instruments, pachymetry measurement and correlation with ultrasound, screening eye-bank corneas, detection of keratoconus, identifying corneal ectasia after refractive surgery, and miscellaneous applications. Studies were analyzed and critically compared in relation to attributes, applications, and limitations of Orbscan corneal topography. The review highlights advantages of this technique in assessing the cornea in health and disease and after surgery and identifies specific aspects that require further investigation and clarification.

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“…Although this has not been correlated with postoperative astigmatism, the higher order aberrations combined with the pre-existing corneal aberrations will cause deterioration in visual and refractive outcomes. Baek et al 14 have reported that corneal irregular astigmatism increases after LASIK and this astigmatism is dependant on the ablation depth. Risk factors for postoperative astigmatism after LASIK RB Vajpayee et al…”

Section: Discussionmentioning

confidence: 99%

Risk factors for postoperative cylindrical prediction error after laser in situ keratomileusis for myopia and myopic astigmatism

Vajpayee

Ghate

Sharma

et al. 2006

Eye

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Purpose To study the risk factors for the occurrence of cylindrical prediction error (PE) after laser in situ keratomileusis (LASIK) for myopia and myopic astigmatism. Methods The study was a nested case-control study. Five hundred eyes of 252 consecutive patients who underwent LASIK for myopia and myopic astigmatism on the Chiron Technolas 217C laser and completed 6 months of followup. There were 435 controls and 65 cases based on the postoperative refractive cylindrical PE. The probable risk factors studied included preoperative sphere and cylinder, keratometry, pachymetry, suction ring used, flap thickness, hinge centeration, optic zone, ablation depth, and intraoperative complications. Results By univariate analysis, the cylindrical PE was found to be associated with preoperative spherical equivalent higher than À6 D (v 2 ¼ 10.83; P ¼ 0.001), preoperative sphere higher than À6 D (v 2 ¼ 6.15, P ¼ 0.013), preoperative cylinder more than À0.75 D (v 2 ¼ 6.61; P-value ¼ 0.010), and an optic zone less than 5.5 mm (v 2 ¼ 19.3; P ¼ 0.001). Risk factors for postoperative astigmatism by stepwise multivariate logistic regression analysis were an optic zone of less than 5.5 mm with an odds ratio (OR) of 2.81 (95% confidence interval (CI) ¼ 1.62-4.86) and preoperative cylinder more than À0.75 D with an OR of 1.60 (95% CI ¼ 0.92-2.77). Conclusion Postoperative astigmatism (as indicated by the cylindrical PE) is more likely to occur with an optic zone of less than 5.5 mm and a higher preoperative cylindrical error.

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Corneal irregular astigmatism after laser in situ keratomileusis for myopia

Abstract: Conclusion-LASIKsignificantly increases the asymmetry component of the cornea which is dependent on the amount of laser ablation. (Br J Ophthalmol 2001;85:534-536)

Cited by 27 publications

References 23 publications

Corneal Irregular Astigmatism After Hyperopic Laser In Situ Keratomileusis

Corneal Irregular Astigmatism After Hyperopic Laser In Situ Keratomileusis

Orbscan computerized topography: Attributes, applications, and limitations

Risk factors for postoperative cylindrical prediction error after laser in situ keratomileusis for myopia and myopic astigmatism

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