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

2021 ◽  
Vol 10 (7) ◽  
pp. 7689-7696
Author(s):  
Ziqing Feng ◽  
Qianru Wang ◽  
Chunyu Du ◽  
Fan Yang ◽  
Xue Li
Keyword(s):  
High Myopia ◽  
High Order ◽  
High Order Aberration

scholarly journals Evaluation of Corneal Higher-Order Aberrations by Scheimpflug–Placido Topography in Patients with Different Refractive Errors: A Retrospective Observational Study

2019 ◽  
Vol 2019 ◽  
pp. 1-5 ◽  
Author(s):  
Mohamed Anbar ◽  
Engy Mohamed Mostafa ◽  
Ashraf Mostafa Elhawary ◽  
Islam Awny ◽  
Mahmoud Mohamed Farouk ◽  
...  
Keyword(s):  
Observational Study ◽  
High Myopia ◽  
Spherical Aberration ◽  
High Order ◽  
Retrospective Observational Study ◽  
Refractive Errors ◽  
Ophthalmological Examination ◽  
High Order Aberration ◽  
Myopic Astigmatism ◽  
High Order Aberrations

Purpose. To report the characteristics of anterior and posterior corneal high-order aberrations in patients with different refractive errors.Setting. This study was conducted at Sohag Refractive Center, Sohag, Egypt.Design. This is a retrospective observational study.Methods. This study evaluated 750 patients (750 eyes) who were seeking refractive surgery. The eyes were stratified into five groups (150 eyes/group) based on refractive error: mild-to-moderate myopia, high myopia, hyperopia, simple myopic astigmatism, and simple hypermetropic astigmatism. All patients were subjected to comprehensive ophthalmological examination including corneal topography and corneal aberrometry using the Scheimpflug–Placido topography (Sirius, CSO, Italy).Results. Coma aberration was statistically significant when compared in all five groups (P=0.01). It was highest in the hypermetropia group (0.26 ± 0.12 μm) but lower in the moderate myopia, high myopia, myopic astigmatism, and hypermetropic astigmatism groups. Spherical aberration was lowest in the hypermetropia group and significantly different from that in the other groups. Trefoil was statistically insignificant when all groups were compared (P=0.062) but was highest in the myopic astigmatism group (0.24 ± 0.25 μm). Total RMS peaked in the hypermetropia group (0.99 ± 0.70).Conclusions. In normal corneas and regular refractive errors, the cornea-induced high-order aberration was minimal, and all types of refractive errors were associated with certain types of high-order aberrations, with a significant increase in spherical aberration in the hypermetropia group.

High-Order Aberration Measurement Method for Hyper-NA Lithographic Projection Lens

2017 ◽  
Vol 37 (4) ◽  
pp. 0412003
Author(s):  
诸波尔 Zhu Boer ◽  
王向朝 Wang Xiangzhao ◽  
李思坤 Li Sikun ◽  
孟泽江 Meng Zejiang ◽  
张恒 Zhang Heng ◽  
...  
Keyword(s):  
Measurement Method ◽  
High Order ◽  
Projection Lens ◽  
High Order Aberration

A wavefront aberrometer for dynamic high-order aberration measurement

Optik ◽  
2010 ◽  
Vol 121 (15) ◽  
pp. 1405-1411
Author(s):  
Xiang Yu ◽  
Yun Dai ◽  
Xuejun Rao ◽  
Cheng Wang ◽  
Lixia Xue ◽  
...  
Keyword(s):  
High Order ◽  
High Order Aberration

High-order aberration control during exposure for leading-edge lithography projection optics

2016 ◽  
Author(s):  
Yasuhiro Ohmura ◽  
Yosuke Tsuge ◽  
Toru Hirayama ◽  
Hironori Ikezawa ◽  
Daisuke Inoue ◽  
...  
Keyword(s):  
Leading Edge ◽  
High Order ◽  
High Order Aberration ◽  
Projection Optics

Influence of Misalignment on High-Order Aberration Correction for Normal Human Eyes

2008 ◽  
Vol 25 (4) ◽  
pp. 1309-1312 ◽  
Author(s):  
Zhao Hao-Xin ◽  
Xu Bing ◽  
Xue Li-Xia ◽  
Dai Yun ◽  
Liu Qian ◽  
...  
Keyword(s):  
High Order ◽  
Aberration Correction ◽  
High Order Aberration ◽  
Normal Human ◽  
Human Eyes

scholarly journals High Order Aberration Correction in a Post-Column Energy Filter

2010 ◽  
Vol 16 (S2) ◽  
pp. 56-57
Author(s):  
N Menon ◽  
M Barfels ◽  
RD Twesten
Keyword(s):  
High Order ◽  
Aberration Correction ◽  
High Order Aberration

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

scholarly journals Simultaneously measuring ocular aberration and anterior segment biometry during accommodation

2015 ◽  
Vol 08 (02) ◽  
pp. 1550005 ◽  
Author(s):  
Yuanyuan Wang ◽  
Yilei Shao ◽  
Yimin Yuan
Keyword(s):  
Anterior Segment ◽  
Crystalline Lens ◽  
Front Surface ◽  
High Order ◽  
Human Vision ◽  
Wavefront Aberrations ◽  
High Order Aberration ◽  
Key Factor ◽  
Set Up

In the human eye, accommodation is essential for functional vision. However, the mechanisms regulating accommodation and the ocular parameters affecting aberrations remain to be explored. In order to measure the alterations of ocular aberration and crystalline lens biometry during dynamic accommodative stimuli, we designed an optical coherence tomography with ultra-long penetration depth (UL-OCT) combined with a Shack–Hartmann wavefront sensor (SHWFS). This integrated set up measures human eye's anterior segment as well as monochromatic high-order aberrations (HOAs) with 6 μm resolution and (1/20) λ accuracy. A total of 10 healthy volunteers without ocular diseases were examined. Upon exposure to accommodative stimuli, the wavefront aberrations became larger. Among the anterior segment biometry, the anterior crystalline lens demonstrated significant curvature during accommodation and was the major cause of high-order aberration. These findings suggest that the front surface of the crystalline lens can significantly affect variation among aberrations, which is a key factor underlying the quality of human vision.

scholarly journals Contralateral Eye Study On The Characteristics of Corneal Aberration In Patients With Bilateral Keratoconus And Unilateral Corneal Vogt’s Striae

2021 ◽  
Author(s):  
Jing Li ◽  
Yaohua Zhang ◽  
Yong Li ◽  
Yan Cai ◽  
Jing Du ◽  
...  
Keyword(s):  
Spherical Aberration ◽  
Front Surface ◽  
High Order ◽  
Back Surface ◽  
Morphological Parameters ◽  
High Order Aberration ◽  
Contralateral Eye

Abstract Purpose: To assess the corneal high-order aberration(HOA) and its correlation with corneal morphological parameters in patients with bilateral keratoconus (KCN) and unilateral Vogt’s striae.Methods: A total of 168 eyes of 84 patients with KCN, whose corneas had definite signs of unilateral Vogt’s striae were enrolled. Corneal HOA and morphological parameters were measured using Pentacam HR.Results: The corneal morphological parameters between KCN eyes with and without Vogt’s striae were evidently different (P < 0.001). The 3rd coma 90°, 4th spherical aberration, 5th coma 90°, RMS (total), and RMS (HOA) in the front, back surfaces and total cornea in KCN eyes with Vogt’s striae were significantly higher than those in KCN eyes without Vogt’s striae (P < 0.001). In KCN eyes with Vogt’s striae, the 3rd coma 90° and 4th spherical aberration in the front surface and total cornea were negatively correlated with K1, K2, Km, Kmax, ACE, and PCE (P < 0.05). The 3rd coma 90° , 4th spherical aberration in back surface and RMS (total), RMS (HOA) in the front, back surfaces, total cornea were positively correlated with K1, K2, Km, Kmax, ACE, and PCE (P < 0.05).Conclusions: Corneal HOA especially vertical coma and spherical aberration may increase when Vogt’s striae appeared in KCN eyes. The scale of increase was significantly related with changes in corneal shapes.

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