advertisement
Abstract #5856 Published in IGR 2-1
Fourier analysis of irregular astigmatism after trabeculectomy
Hayashi K; Hayashi H; Oshika T; Hayashi FOphthalmic Surgery and Lasers 2000; 31: 94-99
OBJECTIVE: To examine irregular astigmatism following trabeculectomy using Fourier analysis of videokeratography data. PATIENTS AND METHODS: Forty eyes of 40 glaucoma patients undergoing primary trabeculectomy, underwent videokeratographic examinations preoperatively, and at two weeks and one, three, six, and 12 months postoperatively. The dioptric data of the central cornea were decomposed into spherical, regular astigmatic, and irregular astigmatic (decentration and higher-order irregularity) components using Fourier analysis. RESULTS: The mean spherical equivalent did not change throughout the observation period. The regular astigmatic component from two weeks to six months postoperatively was greater than the preoperative diopter, but the increase was not significant. In contrast, the decentration component increased significantly after surgery, but returned to the preoperative level by 12 months. The higher-order irregularity component also presented a transient increase postoperatively. CONCLUSIONS: Irregular astigmatism, particularly decentration component, increases significantly after trabeculectomy, but returns to the preoperative level 12 months after surgery.
Dr. K. Hayashi, Hayashi Eye Hospital, 4-7-13 Hakataekimae, Hakata-Ku, Fukuoka 812, Japan
Classification:
12.8.1 Without tube implant (Part of: 12 Surgical treatment > 12.8 Filtering surgery)
