Changes in Contrast Sensitivity Function and Ocular Higher Order Aberration by Conventional Myopic Photorefractive Keratectomy

Sakata, Nobuchika; Tokunaga, Tadatoshi; Miyata, Kazunori; Oshika, Tetsuro

doi:10.1007/s10384-007-0467-9

Cited by 33 publications

(16 citation statements)

References 29 publications

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“…This change was greater than in our study, in which the Strehl ratio decreased by a factor of 1.10 in the PRK group and 1.07 in the LASIK group; this could be attributed to the shorter postoperative period in the study by Marcos. Sakata et al 33 also found that PRK significantly reduced the area under the contrast sensitivity function by a factor of 1.07 on average, which fairly correlates with the MTF findings in our study.…”

Section: Discussionsupporting

confidence: 94%

“…There have been several attempts to assess aberrations in eyes that have had PRK and LASIK using this technique. In general, the results showed significantly more HOAs after PRK and LASIK, 14,[24][25][26][27][28][29][30][31][32][33] although in general, no significant differences between the techniques were observed. 14,25 Retinal image quality can also be clinically assessed with instruments based on the double-pass technique.…”

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confidence: 98%

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Optical quality after myopic photorefractive keratectomy and laser in situ keratomileusis: Comparison using a double-pass system

Ondategui

Vilaseca

Arjona

et al. 2012

Journal of Cataract and Refractive Surgery

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Section: Discussionsupporting

confidence: 94%

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confidence: 98%

Optical quality after myopic photorefractive keratectomy and laser in situ keratomileusis: Comparison using a double-pass system

Ondategui

Vilaseca

Arjona

et al. 2012

Journal of Cataract and Refractive Surgery

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“…However, refractive procedures also inevitably alter corneal SA and the extent of the change varies by procedure. Some reports have found that laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) procedures tended to increase postoperative corneal SA, but to varying extents [4-7]. After myopic correction, corneal SA changed to a more positive value [7], while after hyperopic correction, corneal SA changed from a positive to a negative value [8].…”

mentioning

confidence: 99%

Changes in Spherical Aberration after Various Corneal Surface Ablation Techniques

Ahn¹,

Chung

Kim

et al. 2013

Korean J Ophthalmol

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PurposeThe corneal change induced by refractive procedures influence both the postoperative refractive status and the ocular spherical aberration (SA). We evaluated changes in corneal SA after three types of surface ablation: phototherapeutic keratectomy (PTK), myopic photorefractive keratectomy (PRK), and myopic wavefront-guided laser epithelial keratomileusis (LASEK).MethodsTwenty-six eyes (25 patients) were subjected to PTK 26 eyes (14 patients) to PRK, and 34 eyes (17 patients) to wavefront-guided LASEK. Corneal SA was measured with the iTrace in all patients both preoperatively and 6 months postoperatively.ResultsSix months after surgery, mean corneal SA was -0.173 ± 0.171 µm in the PTK group, 0.672 ± 0.200 µm in the PRK group, and 0.143 ± 0.136 µm in the wavefront-guided LASEK group. The mean difference between the preoperative and postoperative corneal SA (ΔSA) was -0.475 µm in the PTK group, 0.402 µm in the PRK group, and -0.143 µm in the wavefront-guided LASEK group.ConclusionsSurgically induced changes in corneal SA vary with procedure. The prediction of the pattern of SA change induced by various surface ablation procedures may be helpful for developing future surgical procedures.

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“…These results indicated that the centration errors exerted a significant influence on the residual wavefront aberrations [8]. Decentrations during refractive surgery may account for a portion of the postoperative increases in higherorder aberrations [9,10]. On the other hand, lateral decentration produced significantly greater residual higher-order aberrations RMS values than cyclotorsional misalignment during wavefront-guided excimer laser corneal ablation [11].…”

Section: Introductionmentioning

confidence: 65%

The influence of the aspheric profiles for transition zone on optical performance of human eye after conventional ablation

Fang

2014

J. Eur. Opt. Soc.-Rapid Publ.

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The analysis in the impact of transition zone on the optical performance of human eye after laser refractive surgery is important for improving visual correction technology. By designing the ablation profiles of aspheric transition zone and creating the ablation profile for conventional refractive surgery in optical zone, the influence of aspheric transition zone on residual aberrations was studied. The results indicated that the ablation profiles of transition zone had a significant influence on the residual wavefront aberrations. For a hyperopia correction, the profile #9 shows a larger induced coma and spherical aberration when the translation of the centre of pupil remains constant. However, for a myopia astigmatism correction, the induced coma and spherical aberration in profile #1 shows relatively larger RMS values than those in other profiles. Therefore, the residual higher order aberrations may be decreased by optimizing ablation profiles of transition zone, but they cannot be eliminated. In order to achieve the best visual performance, the design of ablation pattern of transition zone played a crucial role.

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Changes in Contrast Sensitivity Function and Ocular Higher Order Aberration by Conventional Myopic Photorefractive Keratectomy

Abstract: PRK significantly increases ocular higher order aberrations, which compromise contrast sensitivity function after surgery.

Cited by 33 publications

References 29 publications

Optical quality after myopic photorefractive keratectomy and laser in situ keratomileusis: Comparison using a double-pass system

Optical quality after myopic photorefractive keratectomy and laser in situ keratomileusis: Comparison using a double-pass system

Changes in Spherical Aberration after Various Corneal Surface Ablation Techniques

The influence of the aspheric profiles for transition zone on optical performance of human eye after conventional ablation

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