Corneal asphericity and spherical aberration after refractive surgery

Abstract

No author has a financial or proprietary interest in any material or method mentioned.

Cryopreservation of Extracted Corneal Lenticules after Small Incision Lenticule Extraction for Potential Use in Human Subjects

“…The shape of the cornea is more natural after tissue addition compared with tissue subtraction, which does not lead to significant induction of HOAs 21. The total HOAs after FILI remain within normal acceptable values and may be better than hyperopic LASIK/photorefractive keratectomy 22,23.…”

Ray-tracing intraocular lens power calculation using anterior segment optical coherence tomography measurements

“…After myopic LASIK, the corneal asphericity becomes oblate. [23][24][25] With increasing oblateness, the difference in keratometry between the measured portion and the corneal center increases and leads to a hyperopic shift in the postoperative refraction. In the same manner, the deviation from spherical in the anterior corneal profile leads to increases in the postoperative refractive error.…”

Retrospective Analysis Comparing the Preoperative and Postoperative “Q” Values for 2 Different Lasers in Refractive Surgery

“…10 Clearly, greater refractive correction requires greater corneal reshaping and therefore necessitates a greater net DQ. 11 However, DQ depends on more than just the amount of refractive correction accomplished. An increased change in asphericity can be caused by variable application of laser fluence with treatment depth, stromal and epithelial remodeling after surgery, and variable laser efficiency with the cosine effect and oblique incidence of laser energy.…”

“…[13][14][15] It has been suggested that both lasers have a similar effect on the final HOA. 11,16,17 However, on review of the literature, no studies examining the effect of lasers on the Q value for PRK were found.…”