Corneal refractive surgery: past to present

McAlinden, Colm

doi:10.1111/j.1444-0938.2012.00761.x

Cited by 73 publications

(57 citation statements)

References 107 publications

(97 reference statements)

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“…The main surgical step of this procedure is the flap creation [1], which induces corneal higher-order aberrations (HOAs) and may compromise postoperative visual quality [2]. In 1994, Liang et al used a Shack-Hartmann wavefront sensor to describe HOAs in human eye and detect HOAs 3 years later [3, 4].…”

Section: Introductionmentioning

confidence: 99%

“…Theoretically, this improvement allows an optimized correction not only of spherocylindrical errors but also of HOAs [5–7]. However, the induction of corneal HOAs has also been reported [1, 8, 9]. …”

Section: Introductionmentioning

confidence: 99%

“…Its main advantage over mechanical microkeratomes is that femtosecond laser allows surgeons to customize the parameters of corneal flap, such as diameter, thickness, and hinge position, which may reduce the incidence of intraoperative complications, including irregular or buttonholed flaps and epithelial defects [7, 11, 12]. The femtosecond laser-created flaps also showed stronger adhesion at the interface and flap edge than microkeratome flaps [1, 13]. During the SMILE procedure, an intrastromal lenticule is created with the femtosecond laser and then removed through a small incision to avoid the creation of the flap.…”

Section: Introductionmentioning

confidence: 99%

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SMILE and Wavefront-Guided LASIK Out-Compete Other Refractive Surgeries in Ameliorating the Induction of High-Order Aberrations in Anterior Corneal Surface

Liu

Liao

et al. 2016

Journal of Ophthalmology

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Purpose. To compare the change of anterior corneal higher-order aberrations (HOAs) after laser in situ keratomileusis (LASIK), wavefront-guided LASIK with iris registration (WF-LASIK), femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK), and small incision lenticule extraction (SMILE). Methods. In a prospective study, 82 eyes underwent LASIK, 119 eyes underwent WF-LASIK, 88 eyes underwent FS-LASIK, and 170 eyes underwent SMILE surgery. HOAs were measured with Pentacam device preoperatively and 6 months after surgery. The aberrations were described as Zernike polynomials, and analysis focused on total HOAs, spherical aberration (SA), horizontal coma, and vertical coma over 6 mm diameter central corneal zone. Results. Six months postoperatively, all procedures result in increase of anterior corneal total HOAs and SA. There were no significant differences in the induced HOAs between LASIK and FS-LASIK, while SMILE induced fewer total HOAs and SA compared with LASIK and FS-LASIK. Similarly, WF-LASIK also induced less total HOAs than LASIK and FS-LASIK, but only fewer SA than FS-LASIK (P < 0.05). No significant difference could be detected in the induced total HOAs and SA between SMILE and WF-LASIK, whereas SMILE induced more horizontal coma and vertical coma compared with WF-LASIK (P < 0.05). Conclusion. FS-LASIK and LASIK induced comparable anterior corneal HOAs. Compared to LASIK and FS-LASIK, both SMILE and WF-LASIK showed advantages in inducing less total HOAs. In addition, SMILE also possesses better ability to reduce the induction of SA in comparison with LASIK and FS-LASIK. However, SMILE induced more horizontal coma and vertical coma compared with WF-LASIK, indicating that the centration of SMILE procedure is probably less precise than WF-LASIK.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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SMILE and Wavefront-Guided LASIK Out-Compete Other Refractive Surgeries in Ameliorating the Induction of High-Order Aberrations in Anterior Corneal Surface

Liu

Liao

et al. 2016

Journal of Ophthalmology

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“…Therefore, it is essential to use accurate instruments that provide a high repeatability of the different ocular parameters and in agreement with other devices [1–3]. …”

Section: Introductionmentioning

confidence: 99%

Repeatability of Ocular Measurements with a Dual-Scheimpflug Analyzer in Healthy Eyes

Fuente

Sánchez‐Cano

Segura

et al. 2014

BioMed Research International

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Purpose. To assess the repeatability of the Galilei dual Scheimpflug analyzer (GDSA) in anterior segment examination. Methods. Fifty-two eyes from 52 healthy volunteers were prospectively and consecutively recruited. Anatomic, axial, refractive, and instantaneous parameters were measured with GDSA to provide a complete characterization of the anterior segment. Repeatability was assessed calculating intraclass correlation coefficient (ICC), and coefficient of variation (COV). Results. Correlation among repeated measurements showed almost perfect reliability (ICC > 0.81) for all parameters except thinnest central corneal thickness (CCT) (0.78), corneal thickness average out (0.79), and posterior axial curvature average out (0.60). Repeatability was excellent (COV < 10%) for all parameters except anterior chamber volume and, superior iridocorneal angle and eccentricities. In these last three parameters, repeatability limits were excessively high compared to the mean. Conclusions. GDSA in healthy young persons had an almost perfect correlation in measuring anatomic, axial, instantaneous, and refractive parameters with greater variability for peripheral terms. Repeatability of anatomical parameters like pachymetry, anterior chamber, or iridocorneal angle and eccentricity were limited. In healthy young persons, the other evaluated parameters had very good repeatability and their limits of agreement showed excellent clinical results for this device.

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“…Errors in the measurement of these parameters before surgery might result in postoperative refractive errors. Reducing postoperative refraction depends upon correct preoperative evaluation of the anterior segment measurements [1, 2]. …”

Section: Introductionmentioning

confidence: 99%

Comparison of Anterior Segment Measurements Obtained by Three Different Devices in Healthy Eyes

Fuente

Sánchez‐Cano

Segura

et al. 2014

BioMed Research International

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Purpose. To assess the normal values and the repeatability of the Galilei Dual Scheimpflug Analyzer (GDSA), the biometer IOL Master, and the autokerato/refractometer WAM 5500 in anterior segment examinations. Methods. Eighty-eight eyes from 88 healthy volunteers were prospectively and consecutively recruited. The repeatability was assessed, calculating the intraclass correlation coefficient (ICC). Results. The correlations among the repeated measurements showed nearly perfect reliability (ICC > 0.81) for all of the parameters, except corneal astigmatism Galilei (0.79) and WAM (0.68). There were statistically significant differences (P < 0.001) between the values of the flat simulated keratometry (SimK) and the steep SimK measured by GDSA and the other methods; however, there were no statistically significant differences for the values obtained with the IOL Master and WAM 5500 (P = 0.302 and P = 0.172, resp.) or between the values of the ACD (P < 0.001) and WTW (P = 0.007) measured by the IOL Master and GDSA. Conclusions. The anterior segment measurements from the IOL Master and WAM 5500 were highly repeatable, comparable, and well correlated. In healthy young persons, the evaluated parameters had very good repeatability, although significant differences were found between the GDSA and IOL Master and between the GDSA and WAM 5500.

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Corneal refractive surgery: past to present

Cited by 73 publications

References 107 publications

SMILE and Wavefront-Guided LASIK Out-Compete Other Refractive Surgeries in Ameliorating the Induction of High-Order Aberrations in Anterior Corneal Surface

SMILE and Wavefront-Guided LASIK Out-Compete Other Refractive Surgeries in Ameliorating the Induction of High-Order Aberrations in Anterior Corneal Surface

Repeatability of Ocular Measurements with a Dual-Scheimpflug Analyzer in Healthy Eyes

Comparison of Anterior Segment Measurements Obtained by Three Different Devices in Healthy Eyes

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