ABSTRACT
@#AIM: To study the consistency of pre-operative and postoperative wave-front aberration between SCHWIND and SIRIUS eye anterior segment analysis system. <p>METHODS: Prospective control study. A total of 360 eyes of 180 patients with refractive errors in West China Hospital of Sichuan University were selected. The data, including the degree and the direction of the flat axis and the steep axis, Kappa angle and a variety of high order wave-front aberrations, were measured by SCHWIND and SIRIUS anterior segment analyzers. The average value of each parameter was taken 5 times, and paired sample <i>t</i> test was used and the data was analyzed by SPSS22.0 software. <p>RESULTS: Flat axis degree and direction, steep axis degree and direction, coma, and trefoil were measured preoperatively and 1mo postoperatively by SCHWIND and by SIRIUS eye anterior segment analysis systems, and there were no statistically significant differences between the two machines(<i>P</i>>0.05). Kappa angle was measured 1mo postoperatively and there was no statistically significant differences(<i>P</i>>0.05). There was statistically significant difference(<i>P</i><0.01)preoperatively between two machines of high-order aberrations and spherical aberration(SpAb); values measured by SCHWIND were higher than those measured by SIRIUS. There was no statistically significant difference(<i>P</i>>0.05)between two machines of high-order aberrations or SpAb in 1mo postoperatively. <p>CONCLUSION: SCHWIND and SIRIUS anterior segment eye analysis system have a good consistency of wave-front aberration measurement before and after refractive surgery.
ABSTRACT
@#AIM: To compare and analyze the changes of the anterior corneal surface, posterior surface and total corneal high-order aberration between femtosecond small incision lenticule extraction(SMILE)and implantable collamer lens(ICL)in the correction of moderate and low myopia. <p>METHODS: Retrospective Study. Patients underwent SMILE surgery(<i>n</i>=35)or ICL surgery(<i>n</i>=35)with moderate or low myopia were selected in the refractive center of the Xi'an Aier Eye Hospital from November 2017 to February 2018. Before and 1, 3 and 6mo after surgery, the Scheimpflug phase formation based on Ray Tracing technology was applied to evaluate the anterior corneal surface, posterior surface and total corneal high-order aberration with a diameter of 6mm. Repeated measurement ANOVA was used to analyze the mean square root of corneal coma, spherical aberration and total high-order aberration at different time points. <p>RESULTS: The post-surgery uncorrected visual acuity of both the SMILE group and the ICL group at 1, 3, and 6mo reached or exceeded the pre-surgery best corrected visual acuity, and the pre-surgery corneal aberrations of the two groups were not statistically significant(<i>P</i>>0.05). One month after surgery, the precorneal high-order aberration of the SMILE group was significantly increased(<i>P</i><0.05), while the precorneal high-order aberration of the ICL group was unchanged(<i>P</i>>0.05). Post-corneal aberration of the two groups was not statistically significant(<i>P</i>>0.05). After surgery, and the differences of coma, spherical aberration and total high-order aberration between the two groups were not significantly(<i>P</i>>0.05). <p>CONCLUSION: Compared with SMILE surgery, precorneal high-order aberration induced by ICL is less for moderate and low myopia in the short term.
ABSTRACT
AIM:To compare the higher-order aberrations between implantations of AcrySof and AcrySof ReStor multifocal aspherical intraocular lens(IOL) with various pupil diameters.METHODS:Fifty-four patients(62 eyes)with bilateral senile cataracts were retrospectively selected.Patients were operated with phacoemulsification and IOL implantation.They were divided into two groups based on the IOL implantation of AcrySof IQ and AcrySof ReStor.Wave front aberration:spherical aberration(C12)and the root mean square of the total higher-order aberration(RMSh)were observed 3 months after surgery.RESULTS:The larger the pupil was, the higher the C12 and RMSh were in the eyes (P<0.01).There were no statistical differences in C12 or RMSh between two groups at 5, 6 or 7mm pupil diameters (P>0.05). CONCLUSION:There are no differences between AcrySof IQ group and AcrySof ReStor group at 5, 6 or 7mm pupil diameters.