Computerized Scheimpflug densitometry as a measure of corneal optical density after excimer laser refractive surgery in myopic eyes

Abstract

An early increase and a subsequent reduction in anterior corneal optical density and the refractive index were present in myopic eyes during 1 year after PRK.

Corneal densitometry after photorefractive keratectomy, laser-assisted in situ keratomileusis, and small-incision lenticule extraction

“…14 Previous studies reported corneal densitometry values of 16.76 ± 1.87 GSU, which is similar to our preoperative values: 16.62 ± 1.97 for LASIK, 16.38 ± 1.67 for PRK, and 16.26 ± 1.50 for ReLEx SMILE. 15,16,30 Previous studies have also evaluated corneal densitometry in PRK and LASIK patients both before and after surgery. [14][15][16] As for post-PRK patients, the 3-month postoperative value was 37.81 GSU, and the 12 month one was 26.92 GSU, 15 which is twice the value found in our study.…”

“…15,16,30 Previous studies have also evaluated corneal densitometry in PRK and LASIK patients both before and after surgery. [14][15][16] As for post-PRK patients, the 3-month postoperative value was 37.81 GSU, and the 12 month one was 26.92 GSU, 15 which is twice the value found in our study. Fares et al 16 found no significant differences between pre-and postoperative values for overall corneal densitometry following LASIK, and reported corneal densitometry values 12 months after surgery that were slightly lower than our results.…”

“…14 Corneal densitometry studies have been conducted following refractive surgery, such as photoreactive keratectomy (PRK) 15 or laser in situ keratomileusis (LASIK). 16 However, the Pentacam System comes with an updated map of corneal densitometry, thus yielding complete and accurate information.…”

Wavefront-optimized excimer laser in situ keratomileusis for myopia and myopic astigmatism: Refractive outcomes and corneal densitometry

“…11,13,32 Corneal densitometry has been assessed, and the degree of subepithelial corneal haze and stromal scarring in refractive surgery patients has been quantified. 9,10,12 Most studies used slitlamp observation and subjective assessment to report haze after keratorefractive surgery. However, objective assessments are more accurate and more repeatable than subjective ones.…”

“…7,8 Recently, subepithelial haze and stromal scarring after laser surgery have been quantified and assessed objectively using a Scheimpflug-imaging technique incorporated into different commercial units. [8][9][10] The Pentacam (Oculus Optikger€ ate GmbH) is a noninvasive optical system that uses the Scheimpflug principle to take up to 50 cross-sectional images of the entire anterior segment within 2 seconds. 11 The ability to measure changes in corneal transparency noninvasively and objectively may enable more precise monitoring of progression and may improve patient management.…”