Differences in Axial Length and IOLs Power Basing on Alternative A-Scan or Fellow-Eye Biometry in Macular-Off Rhegmatogenous Retinal Detachment Eyes

Abstract

We observe the potential refractive error basing on alternative A-scan ultrasound and fellow-eye biometry for phacovitrectomy in phakic macula-off rhegmatogenous retinal detachment (RRD) eyes, when IOLMaster fails to obtain data. Vitrectomy without lens extraction was performed for RRD repair. Preoperative axial length was measured using alternative A-scan ultrasound (AL-US). Postoperative axial length in eyes with silicone oil tamponade (AL-SO) and fellow-eye biometry (AL-FE) were obtained using IOLMaster. AL-US, AL-FE and AL-SO were 25.39 ± 2.14 mm, 25.85 ± 2.16 mm and 26.08 ± 2.53 mm, respectively. The Bland-Altman agreements among AL-US, AL-FE and AL-SO were well (95.5%, 21/22 of cases were in LoA). The mean IOLs power calculated using AL-US (Power-US) was 16.81 ± 7.19 D, using AL-FE (Power-FE) was 14.74 ± 6.95 D, and using AL-SO (Power-SO) was 13.54 ± 8.32 D. The difference between AL-US and AL-SO was significant (P < 0.05), while that between AL-FE and AL-SO was not (P > 0.05). The difference between Power-US and Power-SO was significant (P < 0.05), while that between Power-FE and Power-SO was not (P > 0.05). It showed that the alternative A-scan ultrasound leads to significant differences in axial length and IOLs power prediction, while fellow-eye biometry provided similar measurements compared with those of silicone oil-filled eyes after RRD repair.