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
-
To evaluate the effect of Recurrence Score® results (RS; Oncotype DX® multigene assay ODX) on treatment recommendations by Swiss multidiscip...
-
Abstract Objective To evaluate Chinese medicine (CM) formula Bazheng Powder (八正散) as an alternative therapeutic option for female patients...
-
Abstract Purpose Overcoming the flaws of current data management conditions in head and neck oncology could enable integrated informatio...
-
Abstract Soil conditioners can be used to compensate for the insufficient soil nutrition and organic matter (OM) of arable soils. However, ...
-
Caring for Patients with Physical Disabilities: Assessment of an Innovative Spinal Cord Injury Session that Addresses an Educational Gap Des...
-
Ocular Vestibular Evoked Myogenic Potentials: Where Are We Now? Objective: Over the last decade, ocular vestibular evoked myogenic potential...
-
Abstract Objective To study the effects of Astragalus polysaccharide (APS), the primary effective component of the Chinese herb medicine A...
-
Publication date: Available online 6 January 2018 Source: Current Problems in Diagnostic Radiology Author(s): Mark D. Kovacs, Maximilian...
-
Background Chronic rhinosinusitis (CRS) is a commonly observed sequela after radiation therapy to the paranasal sinuses. The histopatholo...
Δεν υπάρχουν σχόλια:
Δημοσίευση σχολίου