Higher order wavefront aberrations of cornea and magnitude of refractive correction in laser in situ keratomileusis

Oshika, Tetsuro; Miyata, Kazunori; Tokunaga, Tadatoshi; Samejima, Tomokazu; Amano, Shiro; Sumiyoshi, Tetsuya; Hirohara, Yoko; Mihashi, Toshifumi; Maeda, Naoyuki; Fujikado, Takashi

doi:10.1016/s0161-6420(02)01028-x

Cited by 162 publications

(88 citation statements)

References 23 publications

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“…Similar tendencies were found for several combined indexes describing coma-like, spherical-like, and total higher order aberration. [18][19][20] The only exception was in the measurements with the OPD-Scan at certain higher order Zernike terms where the absolute values measured by the OPD-Scan were at almost zero value (o0.0001). These terms were several high spatial frequency indexes, namely C10 (C À4 4 ), C14 (C 4 4 ), C15 (C -5 5 ), C20 (C 5 5 ), C21 (C À6 6 ), C22 (C À4 6 ), C26 (C 4 6 ), and C27 (C 6 6 ).…”

Section: Reproducibility Studymentioning

confidence: 99%

Comparison of laser ray-tracing and skiascopic ocular wavefront-sensing devices

Bartsch

Bessho

Gomez

et al. 2007

Eye

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Purpose To compare two wavefront-sensing devices based on different principles. Methods Thirty-eight healthy eyes of 19 patients were measured five times in the reproducibility study. Twenty eyes of 10 patients were measured in the comparison study. The Tracey Visual Function Analyzer (VFA), based on the ray-tracing principle and the Nidek optical pathway difference (OPD)-Scan, based on the dynamic skiascopy principle were compared. Standard deviation (SD) of root mean square (RMS) errors was compared to verify the reproducibility. We evaluated RMS errors, Zernike terms and conventional refractive indexes (Sph, Cyl, Ax, and spherical equivalent). Results In RMS errors reading, both devices showed similar ratios of SD to the mean measurement value (VFA: 57.5711.7%, OPD-Scan: 53.9710.9%). Comparison on the same eye showed that almost all terms were significantly greater using the VFA than using the OPD-Scan. However, certain high spatial frequency aberrations (tetrafoil, pentafoil, and hexafoil) were consistently measured near zero with the OPD-Scan. Conclusion Both devices showed similar level of reproducibility; however, there was considerable difference in the wavefront reading between machines when measuring the same eye. Differences in the number of sample points, centration, and measurement algorithms between the two instruments may explain our results.

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Section: Reproducibility Studymentioning

confidence: 99%

Comparison of laser ray-tracing and skiascopic ocular wavefront-sensing devices

Bartsch

Bessho

Gomez

et al. 2007

Eye

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“…[14][15][16][17][18][19][20][21] Furthermore, some studies demonstrated that the ocular or corneal aberration is correlated significantly with contrast sensitivity after corneal refractive surgery. [22][23][24] Although some studies showed that contrast sensitivity in eyes with an aspherical IOL is better than that in eyes with a spherical IOL, [25][26][27][28][29] to our knowledge, there has been no study to show the statistical association of higher-order aberrations with visual functions in eyes with a standard spherical IOL.…”

Section: Introductionmentioning

confidence: 99%

Correlation of higher-order wavefront aberrations with visual function in pseudophakic eyes

Hayashi

Yoshida

Hayashi

2007

Eye

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Aim To study the correlation between higher-order wavefront aberrations and visual function in eyes with a spherical monofocal intraocular lens (IOL), and to see if the aberrations differ between eyes that received different types of IOLs. Methods One hundred forty-eight eyes of 148 patients who underwent phacoemulsification and implantation of one of five types of acrylic IOL were enrolled. At 1 month after surgery, ocular aberrations were measured using a Hartmann-Shack aberrometer and corneal aberrations were measured using videokeratography. In addition, the aberration of internal optics was determined by subtracting the corneal aberration from the ocular aberration. These aberrations were correlated with visual acuity and with contrast visual acuity under both photopic and mesopic conditions. Results Ocular, corneal, and internal optic aberrations (total aberration, coma, and spherical aberration) were all correlated significantly with visual acuity, as well as with photopic and mesopic contrast visual acuity. The associations between internal optic aberrations and visual function tended to be stronger than were those of corneal aberrations. Furthermore, ocular aberrations differed significantly between eyes with the five different IOLs (Pp0.0078). Specifically, the internal optic spherical aberration was markedly significantly different between eyes (P ¼ 0.0142), and the corneal coma showed a marginally significant difference (P ¼ 0.0421). Conclusion Ocular, corneal, and internal optic higher-order wavefront aberrations are correlated significantly with visual function in eyes with a spherical monofocal IOL. The spherical aberration of the internal optics and coma of the cornea vary between eyes with different types of IOL.

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“…15 Previous studies have shown a relationship between the preoperative-refractive error and the change in corneal SA after myopic-refractive surgery. 16 The OPA algorithm uses corneal topography and wavefront aberrometry, which is designed to reduce preexisting ocular SAs and maintain corneal asphericity. The OPA algorithm compensates for radial energy loss on an individual basis, reducing surgically-induced HOAs.…”

Section: Discussionmentioning

confidence: 99%

Clinical outcomes between optical path difference custom aspheric treatment and optimized prolate ablation photorefractive keratectomy in myopia exceeding 8 diopters

Choi¹,

Park

Lee

2014

Eye

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Purpose Comparison of visual acuity, refractive, and wavefront outcomes associated with optimized prolate ablation (OPA) and optical path difference custom aspheric treatment (OPDCAT) algorithms for correction of myopia exceeding 8 diopters (D). Patients and Methods Patients were randomly assigned to have photorefractive keratectomy (PRK) with OPA (n ¼ 32) or OPDCAT (n ¼ 21) algorithms. Visual acuity, manifest refraction, ocular and corneal higher-order aberrations, corneal asphericity, modulated-transfer function, and pointspread function were compared 1, 3, and 6 months postoperatively. Results Mean manifest-refraction spherical equivalents at 6 months were À 0.24 D in both groups. All patients in both groups had an uncorrected-distance visual acuity of 20/20 or better. Predictability ( ± 1 D from intended refraction) at 6 months was 94% in the OPA group, and in the OPDCAT group it was 86%. The OPA group had less induced corneal and ocular spherical aberrations (SAs) than the OPDCAT group. Postoperative corneal asphericity change was lowest in the OPA group. Both the groups exhibited significantlyimproved AreaRatio-Total value and insignificantly deteriorated AreaRatio-HO value throughout the postoperative period. The OPA group had significantly-higher AreaRatio-Total compared with OPDCAT group at both 1 and 6 months after the operation. Six months after surgery, the Strehl ratio had decreased in both groups, and there was no significant difference between the groups. Conclusion The OPA algorithms yielded higher-objective visual quality and predictability, induced less corneal and ocular SAs, and preserved more preoperativecorneal asphericity than the OPDCAT algorithms.

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Higher order wavefront aberrations of cornea and magnitude of refractive correction in laser in situ keratomileusis

Cited by 162 publications

References 23 publications

Comparison of laser ray-tracing and skiascopic ocular wavefront-sensing devices

Comparison of laser ray-tracing and skiascopic ocular wavefront-sensing devices

Correlation of higher-order wavefront aberrations with visual function in pseudophakic eyes

Clinical outcomes between optical path difference custom aspheric treatment and optimized prolate ablation photorefractive keratectomy in myopia exceeding 8 diopters

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