Comparison of the Postoperative Refractive Errors Measured by Ultrasound and Partial Coherence Interferometers after Phacovitrectomy. |
Ju Hong Park, Seong Young Jeong, Myung Mi Kim, Woo Hyok Chang |
Department of Ophthalmology, Yeungnam University College of Medicine, Daegu, Korea. changwh@ynu.ac.kr |
유리체절제술과 수정체유화술 동시수술 시 접촉식초음파와 부분결합간섭계의 술 후 굴절력 예측 비교 |
박주홍⋅정성용⋅김명미⋅장우혁 |
영남대학교 의과대학 안과학교실 |
Received: 29 January 2015 • Revised: 4 March 2015 • Accepted: 4 June 2015 |
Abstract |
PURPOSE To compare the accuracy of refractive outcome measured by Ultrascan(R) (Alcon, Fort Worth, TX, USA) and partial coherence interferometers after phacovitrectomy. METHODS: We performed a retrospective study in 74 eyes of 74 patients who underwent phacovitrectomy. SRK-T formula was used to predict intraocular lens (IOL) power. The difference between the predicted and postoperative refractive outcomes for the 2 methodologies (Ultrascan(R) and IOL Master(R) [Zeiss, Carl Zeiss, Jena, Germany]) were compared. The predicted refractive outcome was defined as the estimated refractive error when the selected IOL was inserted. RESULTS: The axial length measured using IOL Master(R) was statistically longer than when measured using Ultrascan(R) (23.85 +/- 0.15 mm, 23.56 +/- 0.15 mm, p < 0.001). Based on keratometry, statistically significant difference between the 2 groups was not observed. The postoperative refractive error was more accurate when using the IOL Master(R) than Ultrascan(R) (0.08 +/- 0.74, 0.47 +/- 0.69, p < 0.001). However, in cases of vitreous hemorrhage, the postoperative refractive error was 0.42 +/- 0.49 with the IOL Master(R) and 0.07 +/- 0.54 with the Ultrascan(R). CONCLUSIONS: Generally, IOL Master(R) is a more accurate method for calculating the IOL power prior to phacovitrectomy. However, in cases of vitreous hemorrhage, Ultrascan(R) appears superior to IOL Master(R) when calculating the IOL power. |
Key Words:
IOL Master(R);Phacovitrecotmy;Refractive error;Ultrasound |
|