Vector analysis of astigmatism before and after LASIK: a comparison of two different platforms for treatment of high astigmatism

Biščević, Alma; Bohač, Maja; Koncarevic, Mateja; Anticic, Marija; Dekaris, Iva; Patel, Sudi

doi:10.1007/s00417-015-3177-x

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…For this reason, vector analysis could describe the astigmatism correctly. Very few refractive surgery results such as small-incision lenticule extraction (SMILE), femtosecond lenticule extraction (FLEx) and LASIK had been analyzed in the vector method [ 7 , 9 , 11 , 18 , 20 ]. The aim of this study is to investigate the correction of low to moderate myopic astigmatism following TransPRK in vector method, which has not been reported until now.…”

Section: Discussionmentioning

confidence: 99%

Clinical outcomes of Transepithelial photorefractive keratectomy to treat low to moderate myopic astigmatism

Xi¹,

Zhang²,

He³

2018

BMC Ophthalmol

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BackgroundTo evaluate the refractive and visual outcomes of Transepithelial photorefractive keratectomy (TransPRK) in the treatment of low to moderate myopic astigmatism.MethodsThis retrospective study enrolled a total of 47 eyes that had undergone Transepithelial photorefractive keratectomy. Preoperative cylinder diopters ranged from − 0.75D to − 2.25D (mean − 1.11 ± 0.40D), and the sphere was between − 1.50D to − 5.75D. Visual outcomes and vector analysis of astigmatism that included error ratio (ER), correction ratio (CR), error of magnitude (EM) and error of angle (EA) were evaluated.ResultsAt 6 months after TransPRK, all eyes had an uncorrected distance visual acuity of 20/20 or better, no eyes lost ≥2 lines of corrected distant visual acuity (CDVA), and 93.6% had residual refractive cylinder within ±0.50D of intended correction. On vector analysis, the mean correction ratio for refractive cylinder was 1.03 ± 0.30. The mean error magnitude was − 0.04 ± 0.36. The mean error of angle was 0.44° ± 7.42°and 80.9% of eyes had axis shift within ±10°. The absolute astigmatic error of magnitude was statistically significantly correlated with the intended cylinder correction (r = 0.48, P < 0.01).ConclusionsTransPRK showed safe, effective and predictable results in the correction of low to moderate astigmatism and myopia.

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Section: Discussionmentioning

confidence: 99%

Clinical outcomes of Transepithelial photorefractive keratectomy to treat low to moderate myopic astigmatism

Xi¹,

Zhang²,

He³

2018

BMC Ophthalmol

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“…The discrepancies in very high myopia, mostly with astigmatism, reflected that a new recalculated normogram needs to be considered to our excimer machine system. Astigmatism vector analysis should be included in our calculated normogram [ 48 , 49 ].…”

Section: Discussionmentioning

confidence: 99%

Predictive Factors for Successful High Myopia Treatment Using High-Frequency Laser-In-Situ Keratomileusis

Artini¹,

Riyanto²,

Hutauruk³

et al. 2018

TOOPHTJ

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Aim:To evaluate the predictive factors of LASIK procedure for high myopia with or without astigmatism using a combination of high-frequency femtosecond-assisted LASIK followed by an excimer laser.Methods:This study was a retrospective interventional case series study to evaluate myopic eyes undergoing high platform LASIK with FEMTO LDV Z2 intervention, followed by WaveLight®EX500 excimer laser machine. Subjects were divided into 2 groups: high myopia (SE of -6.01 to -9.00 D) and very high myopia (SE of -9.01 D or higher). Myopic eyes (Spherical Equivalent/SE) less than –13 D were included in this study. Visual Acuity (VA) was evaluated 1 day and 60 days after the procedure. Predictive factors, such as age, degree of sphere, degree of astigmatism, keratometric reading and axial length were analyzed to detect any influences affecting the final VA results.Results:A total of 316 myopia eyes underwent intervention, mean age: 25.3±3.8 years. Target treatment was achieved in 96.1% of patients with high myopia and 69.9% of patients with very high myopia. High degree of sphere and astigmatism constitutes an important factor influencing final VA.Conclusion:Modern machines provide a more promising efficacy and success of LASIK procedure in high myopia: important predictive factors were a high degree of sphere and astigmatism for achieving the optimal final outcome.

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Effect of Astigmatism Treatment With Three Excimer Lasers After Photorefractive Keratectomy

Sedaghat,

Sadeghi,

Varshovi-Jaghargh

et al. 2024

Eye &Amp; Contact Lens: Science &Amp; Clinical Practice

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Objectives: To compare astigmatism correction after photorefractive keratectomy (PRK) using three excimer laser devices, Alcon Wavelight EX500, Schwind Amaris 1,050, and Technolas Teneo317 M2. Methods: This retrospective study included 414 eyes from 414 subjects with a history of PRK performed using Alcon Wavelight (n=172), Schwind Amaris (n=122), and Technolas (n=120). Uncorrected & corrected distance visual acuity (UDVA & CDVA), and refractive status (spherical equivalent (SE) and vector analysis (J0 and J45)) were postoperatively recorded at the 6-month and 12-month examinations. Results: The mean CDVA and J45 at 6-month and 12-month showed no statistically significant difference among the three different excimer lasers (P>0.05). There was a statistically significant difference in mean UDVA and J0 at 6-month and 12-month after PRK among the three groups, with no statistically significant difference between Alcon Wavelight and Schwind Amaris lasers, while both of the prior lasers showed a significant difference with the Technolas laser. The highest and lowest changes in the magnitude of J0 in 6-month and 12-month follow-ups were seen for the Alcon Wavelight and Technolas groups, respectively. Both Schwind Amaris and Technolas had a small hyperopic SE while the Alcon Wavelight's SE was minimally myopic. This difference in SE between Alcon Wavelight and both Schwind Amaris and Technolas reached statistical significance. Conclusion: While all three lasers performed well in reducing preoperative astigmatism; however, the Alcon Wavelight and Schwind Amaris were more effective in correcting astigmatism than the Technolas. The difference between the Alcon Wavelight and Schwind Amaris did not reach statistical significance.

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Vector analysis of astigmatism before and after LASIK: a comparison of two different platforms for treatment of high astigmatism

Cited by 5 publications

References 9 publications

Clinical outcomes of Transepithelial photorefractive keratectomy to treat low to moderate myopic astigmatism

Clinical outcomes of Transepithelial photorefractive keratectomy to treat low to moderate myopic astigmatism

Predictive Factors for Successful High Myopia Treatment Using High-Frequency Laser-In-Situ Keratomileusis

Effect of Astigmatism Treatment With Three Excimer Lasers After Photorefractive Keratectomy

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