Refractive outcome of wavefront guided laser in situ keratomileusis and wavefront guided photorefractive keratectomy in high pre-existing higher order aberration

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

doi:10.1016/j.clae.2014.12.001

Cited by 5 publications

(6 citation statements)

References 26 publications

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“…Our results were in line with previous research; most of these studies were done using different methods of excimer lasers and they did not compare the different repetition rates in PRK procedures [20][21][22][23][24][25][26][27]. Earlier generation excimer lasers were established for lower order aberrations, while HOAs were not considered [3,11,18]. In the current study, there were two eyes with high myopia, which were not significantly improved after PRK surgery.…”

Section: Discussionsupporting

confidence: 89%

“…In one study by Fahim et al [13] the preoperative UCDVA was count fingers, 1month and 3months after surgery, in all eyes, the mean UCDVA improved to 0.04±0.06 Log MAR (9/10) and 0.0±0.0 Log MAR (10/10), respectively. At 12 months after surgery, mean UCDVA had a significant increase, compared to preoperative UCDVA (P=0.010) [13][14][15][16][17][18][19]. In our study, pre and post-operative UCDVA significantly improved in both groups and there was no significant difference between the improvements of two groups.…”

Section: Discussioncontrasting

confidence: 40%

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Photorefractive Keratectomy for Myopia: 100Hz Versus 500Hz Repetition Rate Excimer Laser

Razmjoo¹,

Fazel²,

Raei

et al. 2018

MSOR

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Propose:The aim of this study was to evaluate and compare the results of two devices with different repetition rates (100Hz Vs. 500Hz) in Photorefractive keratectomy (PRK) surgery. Methods:In this research, we studied post-operative outcomes of PRK surgeries performed with two different repetition rates (100 and 500Hz). One-hundred-ten patients underwent PRK, 110 eyes with Technolas 217z100 and 110 eyes with Technolas 317. After 6 months uncorrected distant visual acuity (UCDVA), best-corrected distant visual acuity (BCDVA), refraction and wave-front aberrometry were compared between two groups.Results: Ninety-four eyes (85.45%) in the 100Hz group and 98 eyes (89.09%) in the 500Hz group had a UCDVA of 20/20 or better at the last follow-up examination. The mean SE attempted correction was -3.68D±1.66 in 100Hz group and -3.80D±1.46 in 500Hz group respectively. About high order aberrations (HOAs), The mean of vertical coma, was 0.031±0.241µm in group 100Hz, and -0.062±0.285µm in group 500Hz. Mean postoperative vertical coma was significantly different between two groups (P=0.033). The vertical trefoil, horizontal trefoil and horizontal coma were not significantly different between the groups (P>0.05). Conclusion:Both excimer laser systems were effective, improving the UCDVA in comparison with the pre-operation UCDVA. The results showed that Technolas 217z100 (100Hz repetition rate) in PRK surgeries might have better visual quality outcome.

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Section: Discussionsupporting

confidence: 89%

Section: Discussioncontrasting

confidence: 40%

Photorefractive Keratectomy for Myopia: 100Hz Versus 500Hz Repetition Rate Excimer Laser

Razmjoo¹,

Fazel²,

Raei

et al. 2018

MSOR

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“…Femtosecond laser-assisted in situ keratomileusis (FS-LASIK) has gained widespread popularity over the last several decades as [1–3] a safe, effective, and predictable treatment for correcting myopia and myopic astigmatism. With the progress of refractive surgery, patients’ expectations for refractive surgery are limited to visual acuity but to visual quality as well.…”

Section: Introductionmentioning

confidence: 99%

Changes of corneal high-order aberrations after femtosecond laser-assisted in situ keratomileusis

et al. 2018

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“…Femtosecond laser-assisted in situ keratomileusis (FS-LASIK) has gained widespread acceptance over the past decade as a mainstream, safe, stable, predictable, and effective treatment for the correction of myopia and myopic astigmatism (1)(2)(3). The corneal flap produced by the femtosecond laser is not only suitable for a wide range of people, and has high safety, but also the thickness of the flap is uniform, the ablation accuracy is good, and the corneal fiber is less damaged.…”

Section: Introductionmentioning

confidence: 99%

High-order aberration changes after femtosecond LASIK surgery in patients with high myopia

Feng¹,

Du²,

Yang³

et al. 2021

Ann Palliat Med

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Background: To investigate the relationship between high-order aberration (HOA) changes and RCST/CT (residual corneal stroma thickness/corneal thickness) after femtosecond LASIK surgery.Methods: A total of 65 eyes from 39 patients with high myopia, who had femtosecond (FS) laser-assisted in situ keratomileusis (LASIK) surgery performed in our hospital, were included in this study. HOA and central corneal thickness were measured preoperatively and at 1 week, 1 month, and 3 months after FS-LASIK by Sirius Scheimpflug-Placido topography. Residual corneal stroma thickness (RCST) and ablation depth were measured during surgery. Results: Horizontal coma (Z 3 1 ), spherical aberration (Z 4 0 ), second horizontal coma (Z 5 1 ), second horizontal trefoil (Z 5 3 ), pentafoil (Z 5 5 ), second spherical aberration (Z 6 0 ), and total HOAs were significantly increased at 1 week, 1 month, and 3 months after surgery compared with the preoperative values (P<0.05), but no significant differences were found in horizontal trefoil (Z 3 3 ; P>0.05). Furthermore, Z 3 1 , Z 4 0 , and HOAs were significantly increased at 3 months post-surgery compared with the values at 1 week post-operation (P<0.05).Positive correlations were found between ablation depth and Z 6 0 at 1 week and 1 month after surgery (r=0.291 and 0.337, respectively; P<0.05). Ablation depth was positively correlated with Z 4 0 and Z 6 0 at 3 months after surgery (r=0.439 and 0.336, respectively; P<0.05). The RCST/CT was negatively correlated with Z 4 0 , Z 6 0 , and HOAs at 3 months after surgery (r=−0.322, −0.412, and −0.321, respectively; P<0.05). There were no significant correlations between Zernike coefficients in terms of high-order aberration, HOAs, and RCST/ CT at 1 week and 1 month post-surgery.Conclusions: Corneal HOAs in high myopia patients increased significantly after FS-LASIK surgery, and this was mainly observed as increases in coma and spherical aberration. The greater the ablation depth, the larger the influence on spherical aberrations. The greater the RCST/CT, the smaller the influence of HOAs on the cornea.

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Refractive outcome of wavefront guided laser in situ keratomileusis and wavefront guided photorefractive keratectomy in high pre-existing higher order aberration

Cited by 5 publications

References 26 publications

Photorefractive Keratectomy for Myopia: 100Hz Versus 500Hz Repetition Rate Excimer Laser

Photorefractive Keratectomy for Myopia: 100Hz Versus 500Hz Repetition Rate Excimer Laser

Changes of corneal high-order aberrations after femtosecond laser-assisted in situ keratomileusis

High-order aberration changes after femtosecond LASIK surgery in patients with high myopia

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