The change in internal aberrations following myopic corneal laser refractive surgery
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Colm McAlinden & Jonathan E. Moore
- چاپ و سال / کشور: 2010
Description
Background In virgin eyes, the internal aberrations compensate corneal aberrations, and it has been suggested that the compensation may be feedback-driven and developmental, with active or passive adaptive mechanisms potentially responsible for the aberration auto-compensation. The purpose of this study is to investigate the internal higher order aberrations (HOA) following laser in situ keratomileusis (LASIK). Methods Prospective corneal and internal HOA were measured pre-operatively and 6 months post-operatively on 50 consecutive LASIK patients with the OPD-Scan. Results There were increases to corneal HOA terms Z04 (0.215±0.092 ìm to 0.381±0.180 ìm), Z06 (0.002± 0.018 ìm to 0.049±0.034 ìm) and Z46 (0.010±0.017 ìm to 0.018±0.016 ìm) with corresponding increases to internal HOA terms Z04 (-0.176±0.102 ìm to .0.218± 0.121 ìm), Z06 (0.004±0.022 ìm to .0.010±0.036 ìm) and Z46 (0.008±0.106 ìm to .0.015±0.054 ìm). The increases in internal aberrations attenuated the increase in corneal aberrations, providing an overall lower quantity of total aberration. A greater increase in corneal spherical aberration and associated compensation was found to occur with greater degrees of attempted myopic correction. Conclusion Corneal spherical aberration and Z46 increased with corresponding increases in the internal spherical aberration and Z46 following LASIK. This may be an active compensatory mechanism of the internal optics to change, in order to reduce the effect of induced corneal HOA.
Graefes Arch Clin Exp Ophthalmol (2011) 249:775–781 DOI 10.1007/s00417-010-1459-x Received: 30 April 2010 / Revised: 30 June 2010 / Accepted: 7 July 2010 / Published online: 31 July 2010
