The effect of hinge location on corneal sensation and dry eye after LASIK: a systematic review and meta-analysis

Feng, Yifan; Wang, Dandan; Li, Junhua; Huang, Jinhai; Shi, Jieliang; Ye, Ting; Wang, Qinmei; Zhao, Yune

doi:10.1007/s00417-012-2078-5

Cited by 32 publications

(26 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…SMILE is a flapless surgery with a small incision that is made at the superior aspect of the eye. Since superior-hinged flap may cause severe loss of sensation and presence of dry eye syndrome than horizontal-hinged flap in LASIK, the temporal-hinged corneal flap was made in WFG FS-LASIK in the requirement of the Ethics Committee of Tianjin Eye Hospital [14, 15]. Thus, the corneal wound-healing response at the site of the superior incision could induce an asymmetry of aberration in the vertical direction [27].…”

Section: Discussionmentioning

confidence: 99%

“…The temporal-hinged corneal flap was made in the requirement of the Ethics Committee of Tianjin Eye Hospital because studies showed horizontal-hinged flap may cause less loss of sensation and presence of dry eye syndrome than superior-hinged flap in LASIK [14, 15]. Refraction and wavefront information for the treated eyes was collected using a WaveScan system and after being carefully scanned and selected was transferred to the STAR S4 excimer laser system.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of ocular higher-order aberrations after SMILE and Wavefront-guided Femtosecond LASIK for myopia

et al. 2017

View full text Add to dashboard Cite

BackgroundTo compare changes in higher-order aberrations (HOAs) following small incision lenticule extraction (SMILE) and wavefront-guided femtosecond laser-assisted in situ keratomileusis (WFG FS-LASIK), and to investigate correlations between preoperative spherical equivalence (SE) and components of HOAs affecting visual quality.MethodsSixty-five myopic eyes from 38 patients were enrolled in the study retrospectively, either having undergone SMILE or WFG FS-LASIK. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), refractive error, and individual Zernike coefficients of 3rd- to 6th-order HOAs were measured before and 3 months after the surgeries and were compared using the Mann-Whitney test or Student’s t-test. Additional generalized estimating equation analyses (GEE) were used to control for within-subject biases in individual Zernike coefficients between the right and left eyes of the same patients.ResultsThere was no significant difference in UDVA or CDVA after WFG FS-LASIK (Mean ± SD: −0.02 ± 0.07 and −0.04 ± 0.22 respectively, in logMAR) and after SMILE (−0.01 ± 0.06 and −0.04 ± 0.04 respectively). However, greater vertical coma aberration was found after SMILE (p = 0.036). Preoperative SE was correlated to induced horizontal coma (r = −0.608, p = 0.001) in WFG FS-LASIK, and correlated to induced vertical coma (r = −0.459, p = 0.003) in SMILE.ConclusionsBoth SMILE and WFG FS-LASIK can achieve planned visual outcomes in correcting myopia and myopic astigmatism. However, higher vertical coma was shown in SMILE than WFG FS-LASIK which might be a potentially impact factor for patients’ vision under certain lighting conditions and needs further investigation.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Comparison of ocular higher-order aberrations after SMILE and Wavefront-guided Femtosecond LASIK for myopia

et al. 2017

View full text Add to dashboard Cite

show abstract

“…; Perez‐Gomez & Efron ; Feng et al. ; Wei & Wang ). Results in this study demonstrated less reduction in sub‐basal nerve density and the total number of nerves and nerve branches, in favour of SMILE.…”

Section: Discussionmentioning

confidence: 99%

Past and present of corneal refractive surgery

Vestergaard

2014

Acta Ophthalmologica

View full text Add to dashboard Cite

Surgical correction of refractive errors is becoming increasingly popular. In the 1990s, the excimer laser revolutionized the field of corneal refractive surgery with PRK and LASIK, and lately refractive lenticule extraction (ReLEx) of intracorneal tissue, using only a femtosecond laser, has become possible. Two new procedures were developed, ReLEx flex (FLEX) and ReLEx smile (SMILE). Until this thesis, only a few long‐term studies of PRK with a relatively limited number of patients had been published; therefore, this thesis intended to retrospectively evaluate long‐term outcomes after PRK for all degrees of myopia for a large number of patients. Furthermore, a prospective contralateral eye study comparing FLEX and SMILE, when treating high to moderate degrees of myopia, had not been performed prior to this study. This was the second aim of this thesis. In the first study, results from 160 PRK patients (289 eyes) were presented. Preoperative spherical equivalent ranged from −1.25 to −20.25 D, with 78% having low myopia (<−6 D). Average follow‐up time was 16 years (range 13–19 years), making this the longest published follow‐up study on PRK patients. Outcomes from eyes with low myopia were generally superior to outcomes from eyes with high myopia, at final follow‐up. Seventy‐two percent were within ±1.00 D of target refraction, as compared to 47% of eyes with high myopia. However, results from a subgroup of unilateral treated PRK patients indicated that refraction at final follow‐up was affected by myopic progression. Fifty percent of eyes with low myopia had uncorrected 20/20 distance visual acuity or better, as compared to 22% of eyes with high myopia. Haze did not occur if attempted corrections were <−4 D, and only eyes with high myopia lost two lines or more of CDVA (corrected distance visual acuity). Eighty‐one per cent were satisfied or very satisfied with their surgery. Conclusion: The results support the continued use of the excimer laser for corneal surface ablation as a treatment option for correction of low degrees of myopia, and as the treatment of choice for subgroups of refractive patients (thin corneas, etc.). The results also highlight that treatment of higher degrees of myopia with standard PRK should only be done today under special circumstances, due to low refractive predictability, and high risk of corneal haze. Technological advances since then should be taken into account when comparing these results with contemporary techniques. In the second study, 35 patients were randomized to receive FLEX in one eye and SMILE in the other. Preoperative spherical equivalent refraction ranged from −6 to −10 D with low degrees of astigmatism. A total of 34 patients completed the 6 month follow‐up period. Refractive and visual outcomes were very similar for the two methods, as well as tear film measurements and changes in corneal biomechanics. Ninety‐seven percent were within ±1.00 D of target refraction, no eyes lost two lines or more of CDVA, and contrast sensitivity was unaffected after both pro...

show abstract

“…By 6 months, no difference was seen between the groups. 51 Other intraoperative variables that have been linked to post-LASIK dry eye include hinge flap width, flap thickness, and ablation depth. The hypothesis is that wider hinge flaps, thinner flaps, and lower ablation depths preserve more corneal nerves, thereby reducing the risk of dry eye disease.…”

Section: ' Intraoperative Risk Factorsmentioning

confidence: 99%