Ocular higher-order aberrations features analysis after corneal refractive surgery

Abstract Background: To investigate the characteristics and distribution of anterior and posterior surface wavefront aberrations in patients suitable for corneal refractive surgery. Methods: A total of 121 myopic patients (121 eyes, 14-46 years old) who underwent corneal refractive surgery were randomly selected by the Pentacam anterior segment analysis system with a spherical equivalent (SE) of -1.50 to -12.00 D. The corneal anterior and posterior aberrations (higher-order aberration, HOA; spherical aberration, SA; Coma; Trefoil) and Q and K values were detected, and a correlation analysis of the relevant parameters was carried out. Results: The root-mean-square (RMS) of the third to sixth order aberrations of the ocular and corneal wave surface aberrations at a 6.0-mm pupil showed a decreasing trend in patients suitable for the corneal refractive surgery, and the RMS of the third order aberrations accounted for 62.92% of the total HOAs. The coma ratio (coma ratio: coma/total cornea higher-order aberrations) was increased with the increasing diopters, while the spherical aberration ratio (spherical aberration/ total cornea higher-order aberrations) was not changed. In addition, the spherical aberration was 0.203± 0.082 μm (range: 0.061 to 0.503 μm), and the Q30 was -0.19±0.03 (range: -0.58 to 0.31). There were significant differences in the coma aberrations of preoperative corneal anterior surface (3, 1) between the low, middle and high myopia groups (P=0.013). The spherical equivalent was positively correlated with the corneal coma of the preoperative anterior corneal surfaces (R=-0.241, P=0.009), and the Q value was positively correlated with the total higher-order aberrations (R=0.326, P<0.001). Conclusions: Individual wavefront aberrations on the anterior and posterior surfaces of the cornea are comparatively different, and the Zernike coefficients are related to the degree of myopia. Spherical aberrations are the most overriding aberrations of the cornea.

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Study on the corneal higher-order aberrations and correlation in patients with different degrees of myopia suitable for wavefront-guided FS-LASIK

10.21203/rs.2.433/v3 ◽

2019 ◽

Author(s):

Cheng-Zhe Wu ◽

Xun Cui ◽

Zheng-Ri Li ◽

Hong Cui ◽

Hua Jin ◽

...

Keyword(s):

Refractive Surgery ◽

Spherical Aberration ◽

Anterior Segment ◽

Higher Order ◽

Spherical Equivalent ◽

Anterior Surface ◽

Higher Order Aberrations ◽

Wavefront Aberrations ◽

The Third ◽

Corneal Refractive Surgery

Abstract Background: To investigate the characteristics and distribution of anterior surface wavefront aberrations in patients suitable for corneal refractive surgery. Methods: A total of 121 myopic patients (121 eyes, 18-45 years old) who underwent corneal refractive surgery were randomly selected by the Pentacam anterior segment analysis system with a spherical equivalent (SE) of -0.25 to -10.00 D. The corneal anterior aberrations (total higher-order aberration; spherical aberration; Coma; Trefoil) and Q and K values were detected, and a correlation analysis of the relevant parameters was carried out. Results: The root-mean-square (RMS) of the third to sixth order aberrations of the corneal anterior wavefront aberrations at a 6mm analysis diameter showed a decreasing trend in patients suitable for the corneal refractive surgery, and the RMS of the third order aberrations accounted for 62.92% of the total HOAs. The coma ratio (coma/total cornea higher-order aberrations) was increased with the increasing diopters, while the spherical aberration ratio (spherical aberration/ total cornea higher-order aberrations) was not changed. In addition, the spherical aberration was 0.203±0.082 μm (range: 0.061 to 0.503 μm), and the Q30 was -0.19±0.03 (range: -0.58 to 0.31). There were significant differences in the coma aberrations of preoperative corneal anterior surface (3, 1) between the low, middle and high myopia groups (P=0.013). The spherical equivalent was positively correlated with the corneal coma of the anterior corneal surfaces (R=-0.241, P=0.009), and the Q value was positively correlated with the total higher-order aberrations (R=0.326, P<0.001). Conclusions: Individual wavefront aberrations on the anterior surfaces of the cornea are comparatively different, and the Zernike coefficients are related to the degree of myopia. Spherical aberrations are the most overriding aberrations of the cornea.

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Correlation of higher order aberrations and components of astigmatism in myopic refractive surgery candidates

Journal of Current Ophthalmology ◽

10.1016/j.joco.2016.04.007 ◽

2016 ◽

Vol 28 (3) ◽

pp. 112-116 ◽

Cited By ~ 6

Author(s):

Mehrdad Mohammadpour ◽

Zahra Heidari ◽

Hossein Mohammad-Rabei ◽

Ebrahim Jafarzadehpur ◽

Mahmoud Jabbarvand ◽

...

Keyword(s):

Refractive Surgery ◽

Higher Order ◽

Higher Order Aberrations

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Effect of Lower-order Aberrations and Higher-order Aberrations in Laser Refractive Surgery Patients

The Korean Journal of Vision Science ◽

10.17337/jmbi.2019.21.3.421 ◽

2019 ◽

Vol 21 (3) ◽

pp. 421-431

Author(s):

Jeong-mee Kim

Keyword(s):

Lower Order ◽

Refractive Surgery ◽

Higher Order ◽

Higher Order Aberrations ◽

Laser Refractive Surgery

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Innovations in Excimer Laser Refractive Technology – Focus on the WaveLight® EX500 Excimer Laser System

European Ophthalmic Review ◽

10.17925/eor.2010.04.01.44 ◽

2010 ◽

Vol 04 (01) ◽

pp. 44

Author(s):

Arthur Cummings ◽

Keyword(s):

Excimer Laser ◽

Refractive Surgery ◽

Laser System ◽

Higher Order ◽

Corneal Tissue ◽

Night Time ◽

Higher Order Aberrations ◽

Operative Complications ◽

Laser Systems ◽

Technology Focus

Excimer laser refractive surgery aims to correct lower order eye aberrations such as myopia, astigmatism and hyperopia by altering the shape of the corneal curvature through the ablation of corneal tissue. Early excimer systems were associated with concerns over post-operative complications, such as night-time driving problems, glare and halos. Furthermore, it was difficult to prevent or treat higher-order aberrations with these early systems (and conventional refractive surgery procedures). Innovations in excimer laser technology have led to the introduction of excimer laser systems with enhanced features, such as high repetition rates and customised ablation profiles, improving the safety and effectiveness of this type of surgery and allowing a broad range of patients to be treated, including those with higher-order aberrations. This article discusses these innovations in excimer laser refractive technology, focusing on the clinical use of the recently introduced WaveLight® EX500 Excimer Laser system.

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