Off-axis refraction and aberrations following conventional laser in situ keratomileusis

Ma, Luxin, Atchison, David A., & Charman, William N. (2005) Off-axis refraction and aberrations following conventional laser in situ keratomileusis. Journal of Cataract and Refractive Surgery, 31(3), pp. 489-498.

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Purpose: To investigate off-axis refraction and aberrations following conventional laser in situ keratomileusis (LASIK) for myopia and hypermetropia. Setting: School of Optometry, Queensland University of Technology, Australia. Methods: Using an autorefractor, off-axis refractions were analyzed along the horizontal visual field between 35 degrees nasally and 35 degrees temporally in 1 eye each of 15 emmetropic subjects (0.50 to C0.50 diopters [D]), 6 myopic subjects (2.25 to 6.50 D), 6 hyperopic subjects (C1.50 to C3.00 D), 6 myopic LASIK patients (presurgical refraction 2.75 to 9.00 D), and 6 hyperopic LASIK patients (presurgical refraction C0.75 to C2.00 D). Wavefront sensing measured off-axis higher-order aberrations in 2 myopic LASIK patients. Results: In myopic LASIK, the mean spherical components of refraction M became highly myopic away from the center of the visual field; in emmetropic and untreated myopic eyes, there were relatively small myopic shifts and hyperopic shifts, respectively. Off-axis 90-degree to 180-degree astigmatisms J180 in myopic LASIK subjects were greater than in untreated subjects. In hyperopic LASIK, there were mainly hyperopic shifts in M, opposite the direction in emmetropic and untreated hyperopic subjects. Off-axis J180 was less than in emmetropic and untreated hyperopic subjects. Some hyperopic LASIK patients had greater off-axis 45-degree to 135-degree astigmatisms J45 than patients in the other groups. In 2 myopic LASIK patients, Zernike root-mean-square 4th-order aberrations were higher than in the near-emmetropia group because of higher levels of positive spherical aberration. Conclusions: Off-axis aberrations can be dramatically affected by conventional myopic and hyperopic LASIK. In myopic LASIK, the increased off-axis refractive errors may have adverse effects on peripheral visual tasks that are dependent on off-axis refractive errors. The relatively low off-axis refractive errors in hyperopic LASIK patients may improve peripheral visual tasks.

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ID Code: 5474
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal’s website (see link) or contact the author. Author contact details:
DOI: 10.1016/j.jcrs.2004.05.059
ISSN: 0886-3350
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2005 Elsevier
Deposited On: 20 Nov 2006 00:00
Last Modified: 29 Feb 2012 13:15

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