RT Journal Article
T1 Comparing surgically induced astigmatism calculated by means of simulated keratometry versus total corneal  refractive power
A1 Garzón Jiménez, Nuria
A1 Rodríguez Vallejo, Manuel
A1 Carmona González, David
A1 Calvo Sanz, Jorge A.
A1 Poyales Galán, Francisco
A1 Palomino Bautista, Carlos
A1 Zato Gómez de Liaño, Miguel Á
A1 Fernández, Joaquín
AB Purpose: To evaluate surgically induced astigmatism as computed by means of either simulated keratometry (KSIM) or total corneal refractive power (TCRP) after temporal incisions.Methods: Prospective observational study including 36 right eyes undergoing cataract surgery. Astigmatism was measured preoperatively during the 3-month follow-up period using Pentacam. Surgically induced astigmatism was computed considering anterior corneal surface astigmatism at 3mm with KSIM and considering both corneal surfaces with TCRP from 1 to 8mm (TCRP3 for 3mm). The eyes under study were divided into two balanced groups: LOW with KSIM  astigmatism <0.90D and HIGH with KSIM astigmatism ≥0.90D. Resulting surgically induced astigmatism values were compared across groups and measuring techniques by means of flattening, steepening, and torque analysis. Results: Mean surgically induced astigmatism was higher in the HIGH group (0.31D @ 102°) than in the LOW group (0.04  D @ 16°). The temporal incision resulted in a steepening in the HIGH group of 0.15 D @ 90°, as estimated with KSIM,  versus 0.28 D @ 90° with TCRP3, but no significant differences were found for the steepening in the LOW group or for  the torque in either group. Differences between KSIM- and TCRP3-based surgically induced astigmatism values were  negligible in LOW group.Conclusion: Surgically induced astigmatism was considerably higher in the high-astigmatism group and its value was underestimated with the KSIM approach. Eyes having low astigmatism should not be included for computing the  surgicallyinduced astigmatism because steepening would be underestimated.
PB Wichtig
SN 1120-6721
YR 2018
FD 2018
LK https://hdl.handle.net/20.500.14352/18444
UL https://hdl.handle.net/20.500.14352/18444
LA eng
DS Docta Complutense
RD 1 ago 2024