To evaluate the change in the anterior corneal asphericity (Δ) comprehensively calculated using the tangential radius () after LASIK. Forty-two right eyes were evaluated using the Orbscan II corneal topographer. The pre- and postoperative -values of the flat principal semimeridians calculated by the sagittal radius were compared to those by the tangential radius. The -value of each semimeridian in the horizontal region was calculated by . Fourier fitting was used to model the 360-semimeridional variation of -values and to fit the -values in the vertical region before and after surgery. There were significant differences in -values between the two methods before () and after surgery (). A significant increase in postoperative -value was detected compared to preoperative -value () calculated by . The 360-semimeridional variation of the -values was well fitted with a third- and fourth-degree Fourier function before and after surgery. The Δ-value distribution presented double valley variation, with the amount of Δ being lowest in the near-vertical regions and highest in the near-horizontal regions. Calculating the -value with combined with Fourier fitting, we evaluated 360 Δ-values’ variation of semimeridians of the entire anterior corneal surface and then displayed true and complete anterior corneal shape after LASIK.
from #AlexandrosSfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/2ki6VpO
via IFTTT
Εγγραφή σε:
Σχόλια ανάρτησης (Atom)
Δημοφιλείς αναρτήσεις
-
from #AlexandrosSfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/2jCvX3K via IFTTT
-
Abstract Purpose of Review Our goal is to summarize the airway disease literature since September 11, 2001 (9/11), focusing on studies pub...
-
Treatment effectiveness holds considerable importance in the association between service quality and satisfaction in medical service studies...
-
Vol.25 No.2 from #AlexandrosSfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/1P7bHxT via IFTTT
-
Publication date: Available online 16 January 2017 Source: International Journal of Pediatric Otorhinolaryngology Author(s): Kaveh Karimn...
-
Understanding Head And Neck Cancers - The Southeast Sun ... The Southeast Sun (NAPSI)—According to the Centers for Disease Control an...
-
Abstract Background Henoch–Schönlein purpura is the most common vasculitis in children. Its long-term prognosis depends on renal involve...
-
Publication date: June 2017 Source: International Journal of Biological Macromolecules, Volume 99 Author(s): Oliviero Carugo The positio...
-
Publication date: 21 February 2017 Source: Cell Reports, Volume 18, Issue 8 Author(s): Arielle Glatman Zaretsky, Christoph Konradt, Fabien...
Δεν υπάρχουν σχόλια:
Δημοσίευση σχολίου