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Sources of the monochromatic aberrat...

Porter, Jason.

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Sources of the monochromatic aberrations induced in human eyes after laser refractive surgery.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Sources of the monochromatic aberrations induced in human eyes after laser refractive surgery./
Author:	Porter, Jason.
Description:	193 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-08, Section: B, page: 4091.
Contained By:	Dissertation Abstracts International65-08B.
Subject:	Physics, Optics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3142310
ISBN:	9780496892914

Sources of the monochromatic aberrations induced in human eyes after laser refractive surgery.
Porter, Jason.

Sources of the monochromatic aberrations induced in human eyes after laser refractive surgery. - 193 p.

Source: Dissertation Abstracts International, Volume: 65-08, Section: B, page: 4091.

Thesis (Ph.D.)--University of Rochester, 2004.

Laser in-situ keratomileusis (LASIK) procedures correct the eye's defocus and astigmatism but also introduce higher order monochromatic aberrations. Little is known about the origins of these induced aberrations. The advent of wavefront sensor technology has made it possible to measure accurately and quickly the aberrations of normal and postoperative LASIK eyes. The goal of this thesis was to exploit this technology to better understand some of the potential mechanisms by which aberrations could be introduced during LASIK.

ISBN: 9780496892914Subjects--Topical Terms:

1018756
Physics, Optics.

Sources of the monochromatic aberrations induced in human eyes after laser refractive surgery.
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100 1 $a Porter, Jason. $3 614870
245 1 0 $a Sources of the monochromatic aberrations induced in human eyes after laser refractive surgery.
300 $a 193 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-08, Section: B, page: 4091.
500 $a Supervisor: David R. Williams.
502 $a Thesis (Ph.D.)--University of Rochester, 2004.
520 $a Laser in-situ keratomileusis (LASIK) procedures correct the eye's defocus and astigmatism but also introduce higher order monochromatic aberrations. Little is known about the origins of these induced aberrations. The advent of wavefront sensor technology has made it possible to measure accurately and quickly the aberrations of normal and postoperative LASIK eyes. The goal of this thesis was to exploit this technology to better understand some of the potential mechanisms by which aberrations could be introduced during LASIK.
520 $a A first step towards investigating these sources was to characterize the aberration changes in post-LASIK eyes. Higher order rms wavefront error increased after conventional and customized LASIK surgery. On average, spherical aberration approximately doubled, and significant changes in vertical and horizontal coma were observed.
520 $a We examined two sources of postoperative aberrations: the creation of a microkeratome flap and the subsequent laser ablation. Higher order rms increased slightly and there was a wide variation in the response of individual Zernike modes after cutting a flap. The majority of induced spherical aberration was due to the laser ablation and not the flap-cut.
520 $a Aberrations are also induced by static and dynamic decentrations of the patient's pupil. We found that ablations were typically decentered in the superotemporal direction due to shifts in pupil center location between aberration measurement (dilated) and surgical (undilated) conditions in customized LASIK eyes. There was a weak correlation between the horizontal coma theoretically induced by this offset and that measured postoperatively.
520 $a Finally, dynamic eye movements during the procedure induce higher order aberrations. We found that the most problematic decentrations during LASIK are relatively slow drifts in eye position. An eye-tracking system with a 2-Hz closed-loop bandwidth could compensate for most eye movements during LASIK.
520 $a One solution for reducing the aberrations induced by static and dynamic shifts in pupil center location is to reference the aberration measurement and treatment with respect to fixed features on the eye. Several other sources of aberration induction in LASIK, such as the efficiency of laser pulses striking the cornea perpendicularly versus obliquely, must still be investigated to optimize postoperative optical quality after LASIK.
590 $a School code: 0188.
650 4 $a Physics, Optics. $3 1018756
650 4 $a Health Sciences, Ophthalmology. $3 1019445
650 4 $a Engineering, Biomedical. $3 1017684
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690 $a 0381
690 $a 0541
710 2 0 $a University of Rochester. $3 515736
773 0 $t Dissertation Abstracts International $g 65-08B.
790 1 0 $a Williams, David R., $e advisor
790 $a 0188
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3142310