Eyeworld

61 EW REFRACTIVE April 2018 Preoperative sagittal anterior map (right); 1 year postoperative sagittal anterior map (left); the change (bottom) Preoperative sagittal posterior map (right); 1 year postoperative sagittal posterior map (left); minimal change (bottom) Preoperative corneal thickness map (right); 1 year postoperative corneal thickness map (left); the change of 49 microns at the center (bottom) Source (all): Maria Arbelaez, MD Maria Clara Arbelaez, MD, medical director, Muscat Eye Laser Center, Muscat, Oman, who presented the study at the XXXV Congress of the ESCRS. "There were no unexpected refractive outcomes in our patient set with the addition of the Xtra procedure, and none of the eyes developed visually significant haze or other types of complications. All of the eyes were within ±0.50 D, and none lost two or more lines of best corrected distance visual acuity (CDVA). Also, the refractive change was less than 0.50 D between 3 months and 1 year postoperatively." New study The study investigated refractive outcomes and induction of corne- al higher order aberrations (HOA) in eyes that underwent single step transPRK Xtra for myopic astigma- tism on borderline corneas that were not candidates for LASIK, using smart pulse technology and an ab- erration neutral profile centered at the corneal vertex with asymmetric offset. It included 104 eyes that were at a moderate risk for keratectasia and exhibited at least one of the following inclusion criteria: young age, corneal thickness below 500 µm, abnormal corneal topography/ tomography such as mild front or posterior asymmetry, mild inferior front steepening or mild posterior steepening, high correction, CDVA less than 20/25, or a family history of keratoconus. The mean patient age was 26.3 years (range: 18–47 years) with a mean sphere of –3.55 ± 1.44 D (range: 0 to –7.00 D) and a mean cylinder of –1.12 ± 1.11 D (range: 0 to –4.75 D). The mean corneal pachymetry was 489 µm (range: 452–575 µm), and the mean optical zone was 6.3 ± 0.306 mm, using a minimum of 6.3 mm and a maxi- mum of 7.5 mm. The study excluded patients with severe dry eye, systemic disease with ocular involvement, previous corneal or ocular surgery, concur- rent ocular disease, subclinical keratoconus, keratoconus suspect or keratoconus, and who were preg- nant or breastfeeding. Procedures TransPRK is a well-controlled, no-touch procedure that removes the corneal epithelium and stroma simultaneously, as opposed to the more cumbersome two-step proce- dure or complication ridden me- chanical debridement. Dr. Arbelaez implemented the Amaris excimer continued on page 62

• Cover
• Blank Page
• Blank Page (1)