Consistency of two eye anterior segment analysis systems measuring wave-front aberration before and after refractive surgery

Abstract:

AIM: To study the consistency of pre-operative and postoperative wave-front aberration between SCHWIND and SIRIUS eye anterior segment analysis system.

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 t test was used and the data was analyzed by SPSS22.0 software.

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(P>0.05). Kappa angle was measured 1mo postoperatively and there was no statistically significant differences(P>0.05). There was statistically significant difference(P<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(P>0.05)between two machines of high-order aberrations or SpAb in 1mo postoperatively.

CONCLUSION: SCHWIND and SIRIUS anterior segment eye analysis system have a good consistency of wave-front aberration measurement before and after refractive surgery.

Key words:anterior segment analyzer; wave-front aberration; femtosecond laser