Effect of Pupillary Dilation on Corneal Optical Aberrations After Photorefractive Keratectomy

Martínez, Carlos; Applegate, Raymond A.; Klyce, Stephen D.; McDonald, Marguerite B.; Medina, Jan P.; Howland, Howard C.

doi:10.1001/archopht.116.8.1053

Cited by 236 publications

(111 citation statements)

References 48 publications

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“…21,[29][30][31] We also found that surgically induced spherical aberrations, coma aberrations and total higher-order aberrations all increased in higher myopic correction. It is understandable that laser-induced aberrations increase with depth of laser ablation.…”

Section: Discussionsupporting

confidence: 54%

Anterior corneal optical irregularity measured by higher‐order aberrations induced by a broad beam excimer laser

Hsieh

Wang

2012

Clinical and Experimental Optometry

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Background:The aim was to analyse anterior corneal optical irregularity in patients receiving photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) with a conventional broad beam laser. Methods: Pre-and post-operative anterior corneal aberrations including Zernike coefficients and root mean squares of higher-order aberrations were measured and derived with a Placido-ring-based corneal topographer and wavefront software, respectively, from 768 right eyes of patients receiving either PRK or LASIK for myopia with a conventional broad beam excimer laser in National Taiwan University Hospital, Taipei, Taiwan. Multiple linear regression models selected by Mallows' Cp criteria were used to evaluate predictability of surgically induced aberrations and relevant factors. Results: Mean attempted spherical equivalent correction was -7.37 Ϯ 2.33 D (range: -16.5 to -1.95). Root mean squares of higher-order aberrations and variances of Zernike coefficients all increased significantly after surgery (p < 0.01). All post-operative higherorder aberrations increased with the amount of attempted myopic correction and secondary astigmatism increased with attempted cylindrical correction. LASIK surgery induced less coma and third-order aberrations but more fifth-and sixth-order aberrations than PRK, although squared partial correlation coefficients were low. Larger optic and transitional zones meant fewer higher-order aberrations after surgery. Younger patients tended to have more surgically induced aberrations in the 3.0 mm pupil zone. Conclusions: Anterior corneal optical irregularity increased tremendously after refractive surgery by conventional broad beam lasers and correlated with greater attempted myopic correction, younger age and a smaller treatment zone. The effect of corneal flaps on post-operative corneal irregularity differed trivially.

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Section: Discussionsupporting

confidence: 54%

Anterior corneal optical irregularity measured by higher‐order aberrations induced by a broad beam excimer laser

Hsieh

Wang

2012

Clinical and Experimental Optometry

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“…The RMS of third-and fourth-order Zernike components (Z 3 -3 to Z 3 3 , Z 4 -4 to Z 4 4 , respectively) were used to represent coma-and spherical-like aberrations, respectively. [20][21][22][23][24] …”

Section: Measurement Of Hoasmentioning

confidence: 99%

Changes in Higher-Order Aberrations after Scleral Buckling Surgery for Rhegmatogenous Retinal Detachment

et al. 2008

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Design: Prospective observational comparative case series. Participants:The study included 67 eyes of 67 RD patients undergoing scleral buckling surgery, and the fellow normal eyes comprised the control group.Twenty-seven eyes were treated with segmental buckling procedure and 40 eyes received encircling buckling procedure alone. Methods:Hartmann-Shack wavefront analysis was performed at 2 weeks, 1 month, and 3 months postoperatively. Main Outcome Measures: Time course of changes in HOAs.Results: The scleral buckling surgery significantly increased HOAs at 2 weeks (p <

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“…[15][16][17][18][19] Letter-contrast sensitivity was measured with CSV-1000LV chart (Vector Vision, Columbus, OH, USA). This instrument uses letter optotypes all of which were the same size and of low spatial frequency (2.4 cycle/1).…”

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confidence: 99%

Higher-order wavefront aberration and letter-contrast sensitivity in keratoconus

Okamoto

Samejima

et al. 2007

Eye

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Aims To evaluate the relation between higher-order aberration of the eye and contrast sensitivity function in eyes with keratoconus. Methods In 22 eyes of 14 patients with keratoconus (age 30.578.4 years, means7SD) and 26 eyes of 13 normal controls (age 29.276.7 years), ocular higher-order wavefront aberration for a 6-mm pupil was measured with the Hartmann-Schack aberrometer (KR-9000 PW, Topcon). The root mean square (RMS) of third-and fourth-order Zernike coefficients was used to represent higher-order aberrations. The letter-contrast sensitivity was examined using the CSV-1000LV contrast chart (Vector Vision). Results In the keratoconus group, the letter-contrast sensitivity showed significant correlation with third-order (Spearman's correlation coefficient r ¼ À0.736, Po0.001) and fourth-order aberrations (r ¼ À0.464, Po0.05). There was borderline correlation between log MAR BSCVA and third-order (r ¼ 0.413, P ¼ 0.070) and fourth-order aberrations (r ¼ 0.394, P ¼ 0.086). In the normal group, the letter-contrast sensitivity had no significant correlation with third-order (r ¼ À0.170, P ¼ 0.411) and fourth-order aberrations (r ¼ À0.088, P ¼ 0.673), and log MAR best spectacle-corrected visual acuity (BSCVA) showed no correlation with third-order (r ¼ 0.063, P ¼ 0.762) and fourth-order aberrations (r ¼ À0.282, P ¼ 0.165). Conclusions In eyes with keratoconus, there is significant correlation between contrast sensitivity and ocular higher-order wavefront aberrations.

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Effect of Pupillary Dilation on Corneal Optical Aberrations After Photorefractive Keratectomy

Cited by 236 publications

References 48 publications

Anterior corneal optical irregularity measured by higher‐order aberrations induced by a broad beam excimer laser

Anterior corneal optical irregularity measured by higher‐order aberrations induced by a broad beam excimer laser

Changes in Higher-Order Aberrations after Scleral Buckling Surgery for Rhegmatogenous Retinal Detachment

Higher-order wavefront aberration and letter-contrast sensitivity in keratoconus

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