Comparative Evaluation of Higher-Order Aberrations and Corneal Asphericity Between Wavefront-guided and Aspheric LASIK for Myopia

Goyal, Jawahar Lal; Garg, Arushi; Arora, Ritu; Jain, Parul; Goel, Yashpal

doi:10.3928/1081597x-20141021-10

Cited by 23 publications

(13 citation statements)

References 21 publications

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“…The visual outcome and contrast sensitivity were better in the aspheric group at 6 months postoperatively. In a study of forty patients were randomly selected to receive wavefrontguided LASIK (wavefront-guided group) and aspheric LASIK (aspheric group) (40 eyes of 20 patients in each group) using the Technolas 217z excimer laser platform (Bausch & Lomb, Rochester, NY) (6) . Toda et al in a prospective, randomized clinical study, 68 eyes of 35 patients undergoing LASIK were enrolled.…”

Section: Discussionmentioning

confidence: 99%

Q Value Based Ablation Profile versus Topography - Guided LASIK : A Contralateral Comparative Study

Hamza¹,

Assaf²,

Naggar³

2018

Egyptian Journal of Hospital Medicine

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Background: laser in situ keratomileusis (LASIK) has become the most widely used form of refractive surgery. The objective of this surgical technique was to modify the anterior corneal shape by ablating tissue from the stroma by means of the excimer laser after creating a hinged corneal flap. By this way, we were able to change the refractive status of the patient and provided better unaided vision. Continuous improvements in the original technique made the surgical procedure safer, more accurate and repeatable. These progressions are due to the development of novel technologies that are responsible for new surgical instrumentation , which makes the surgical procedure easier for the surgeon and better excimer laser ablation algorithms, which increase the optical quality of the ablation and thus the safety of the vision correction procedure. Aim of work: the aim of this study was to compare between Q value based ablation and topography-guided LASIK as regards safety, visual acuity, contrast sensitivity and high order aberration HOAs (spherical, coma and trefoil). Patients and methods: this study was conducted on 60 eyes of 30 patients, thirty eyes of them underwent topography guided LASIK and the other 30 underwent Q value based ablation. Preoperative CDVA (corrected distant visual acuity) was done. Postoperative UDVA and CDVA were measured. Postoperative high order aberrations were measured 3 months postoperatively. Results: our results showed that there was no statistically significant difference between both groups as regards UDVA, spherical equivalent, high order aberrations and Strehl ratio point spread function. Conclusion: topographic guided ablation and Q value based groups provided essentially equivalent outcomes after myopic LASIK, with statistically insignificant difference between both profiles, although both laser profiles have been found to be effective, safe and predictable. Recommendations: we recommended doing more research regarding this study with larger number of cases and doing further investigations.

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Section: Discussionmentioning

confidence: 99%

Q Value Based Ablation Profile versus Topography - Guided LASIK : A Contralateral Comparative Study

Hamza¹,

Assaf²,

Naggar³

2018

Egyptian Journal of Hospital Medicine

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“…Gatinel et al 14 In later studies, many groups reported findings favoring an aspherically optimized ablation profile over the conventional profiles in terms of most postoperative refractive outcomes. [17][18][19] In a large-scale study including 400 eyes (200 eyes in the wavefront-optimized group and 200 eyes in the custom-Q group), Tawfik et al 20 reported a statistically significant difference in postoperative change in Q-values (P = .02) and postoperative visual acuity (P = .42) between the two groups.…”

Section: Discussionmentioning

confidence: 99%

“…16 Clinically, it has been shown that corneal vertex-centered treatments perform better in terms of induced ocular aberrations and asphericity in myopic eyes with moderate to large pupillary offset. 18 Many groups have explored the optimum corneal asphericity that must be targeted in refractive procedures. Patel et al 24 presented a model predicting that optimal optical imagery is produced when the corneal profile is represented by a flattening ellipse (shape factor = 0.65 to 0.85).…”

Section: Discussionmentioning

confidence: 99%

Postoperative Corneal Asphericity in Low, Moderate, and High Myopic Eyes After Transepithelial PRK Using a New Pulse Allocation

Lin¹,

Holland²,

Verma³

et al. 2017

J Refract Surg

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“…Q-value-guided femtosecond laser-assisted in situ keratomileusis (Q-FS-LASIK) is a safe surgical procedure in which lower spherical aberration is introduced [1][2][3][4], and it has been a popular procedure for corneal refractive surgery. Small-incision lenticular extraction (SMILE) is a new kind of surgical procedure that avoids flap-related complications [5][6] and is gaining more attention.…”

Section: Introductionmentioning

confidence: 99%

Corneal aberrations after small-incision lenticule extraction versus Q-value-guided laser-assisted in situ keratomileusis

Zhang¹,

Li²,

Zhao³

et al. 2018

New Front Ophthalmol

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Aim: To compare the changes in anterior corneal surface aberration characteristics after small-incision lenticule extraction (SMILE) versus Q-value-guided femtosecond laser-assisted in situ keratomileusis (Q-FS-LASIK) Methods:In this prospective comparative study, 102 patients with myopia and myopic astigmatism were divided between the SMILE and Q-FS-LASIK groups, consisting of 51 patients each. High order aberration (HOA), primary spherical aberration (PSA), and primary coma aberration (PCA) of the central 6 mm region of the anterior corneal surface were quantitatively assessed using pre-and post-operative Sirius scanning, and then statistical analysis with repeated measures analysis of variance.Results: Both types of surgery were associated with statistically significant increases in post-operative HOA, PSA, and PCA (both groups P <0.01). In the SMILE group, the variations in HOA, PSA, and PCA were not statistically significant starting at post-operative week 2 (P >0.05). In the Q-FS-LASIK group, the variations in HOA and PCA were not statistically significant starting at post-operative day 1 (P >0.05). Conclusion:Both SMILE and Q-FS-LASIK resulted in an increase in HOA, PSA, and PCA at post-operative day 1. However, Q-FS-LASIK introduced lower HOA and showed better stability. Spherical measurement is highly related to PSA.

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Comparative Evaluation of Higher-Order Aberrations and Corneal Asphericity Between Wavefront-guided and Aspheric LASIK for Myopia

Abstract: Aspheric LASIK induced significantly less change in higher-order aberrations and maintained corneal asphericity better than wavefront-guided LASIK. The visual outcome and contrast sensitivity was better in the aspheric group at 6 months postoperatively.

Cited by 23 publications

References 21 publications

Q Value Based Ablation Profile versus Topography - Guided LASIK : A Contralateral Comparative Study

Q Value Based Ablation Profile versus Topography - Guided LASIK : A Contralateral Comparative Study

Postoperative Corneal Asphericity in Low, Moderate, and High Myopic Eyes After Transepithelial PRK Using a New Pulse Allocation

Corneal aberrations after small-incision lenticule extraction versus Q-value-guided laser-assisted in situ keratomileusis

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