| Title | Research on eye axial length measurement system based on Twyman-Green interferometer combined with digital signal processing |
|---|---|
| ID_Doc | 62537 |
| Authors | Zhou, Q; Xu, K; Chen, MH; Xiang, HZ; Zheng, G; Zhao, J; Zhang, DW; Zhuang, SL; Wang, C |
| Title | Research on eye axial length measurement system based on Twyman-Green interferometer combined with digital signal processing |
| Year | 2021 |
| Published | |
| Abstract | Accurate measurement of ocular axis length (AL) is important for myopia control and vision recovery after cataract lens implantation. A low-coherence dual-beam external differential interference ocular AL measurement system (i.e. the new AL system) was built based on a modified Twyman-Green interferometer with a 790 nm infrared laser as the light source. Combined with digital signal processing techniques, the weak light interferometric signals acquired by DAQ card are processed synchronously. The FIR digital filter and signal envelope extraction method are designed to improve the signal-to-noise ratio, so as to obtain a high signal-to-noise ratio AL interference signal. To verify the effectiveness of the system, the correlation and consistency of AL between the new AL system and IOLMaster are analyzed. The results showed that the new AL system can provide valid AL measurements, indicating that the new AL system developed by our team can be used for routine clinical AL measurements. |
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