The Effect of Age on Corneal Topographic Indices, Keratometry and Visual Acuity After Combined Intrastromal Corneal Ring Segment (ICRS) Implantation and Corneal Crosslinking
- سال انتشار: 1399
- محل انتشار: مجله نظریه پردازی در چشم پزشکی، دوره: 9، شماره: 2
- کد COI اختصاصی: JR_MEOP-9-2_008
- زبان مقاله: انگلیسی
- تعداد مشاهده: 97
نویسندگان
چکیده
Abstract We aimed to assess age-related changes in corneal topographic indices, keratometry and visual acuity after sequential intracorneal ring segment implantation (ICRS) and crosslinking (CXL). This was a retrospective matched case-control series including ۲۶ eyes of patients equal to or less than ۱۸ years as the cases and ۲۶ eyes of adult patients as control. All eyes received ICRS+CXL for progressive keratoconus. Eyes were matched regarding the keratoconus parameters and the treatment (type, number and thickness of ICRS). Data was analyzed for refractive and topographic values [uncorrected and corrected distance visual acuity (UDVA; CDVA) sphere; cylinder; spherical equivalent; maximum keratometry (Kmax); flat keratometry (Kflat); steep keratometry (Ksteep); all ۷ pentacam topographic indices] preoperatively and one year postoperatively. Preoperatively, there was no significant difference for any refractive, clinical or topographic parameters between the groups except for vertical asymmetry. After one year, children had a significantly higher improvement in Ksteep (۳.۰۵D) than adults (۲.۱۰D; P=۰.۰۳۶) and a trend to significance for Kflat (۲.۷D compared to ۱.۷۸D, respectively; P=۰.۰۸۱). UDVA improved by ۴.۳ ETDRS lines in children compared to ۳.۳ ETDRS lines in adults and CDVA improved by ۱.۷ ETDRS lines in children compared to ۱.۲ ETDRS lines in adults, but with no statistical significance. The effects on keratometry indicated that corneal response after ICRS and CXL for keratoconus is more pronounced in young patients than adults. This assumption is also supported by functional improvement and by the fact that a few eyes (۵) of some very young patients (< ۱۳years) showed highly remarkable improvements after surgery (higher than any adult eye).کلیدواژه ها
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