新型近用连续变焦电子助视器在低视力和盲康复中的应用

Newly designed near continuous-focus electronic low vision aids in the clinical rehabilitation of low vision and blind patients

目的比较新型近用连续变焦电子助视器和近用光学助视器在低视力和肓康复中的有效性。方法前瞻性病例对照研究。19例低视力患者和14例盲患者分别使用近用光学助视器和近用连续变焦电子助视器阅读报纸里的新闻文章，记录使用2种仪器后的近视力、阅读速度和阅读持续时间，采用配对t检验对检查结果进行统计学分析。结果所有患者使用近用光学助视器和近用连续变焦电子助视器后近视力相比，差异有统计学意义（t=-2．392，P〈0．05）；盲患者和低视力患者分别使用2种助视器后近视力比较，差异有显著统计学意义（t=-7．433、-8．721，P〈O．01）。所有患者和盲患者使用近用光学助视器和近用连续变焦电子助视器后阅读速度相比，差异有显著的统计学意义（t=-4．290、-6．728，P〈O．01）；低视力患者分别使用2种助视器后阅读速度比较，差异无统计学意义（t=-1．534，P〉0．05）。所有患者、盲患者以及低视力患者分别使用近用光学助视器和近用连续变焦电子助视器后阅读持续时间相比，差异有显著统计学意义（t=-8．211、-6．137、-6．007，P〈0．01）。结论新型近用连续变焦电子助视器与传统的近用光学助视器相比，更能提高患者的近视力和改善阅读能力。

Objective To compare the effectiveness of the newly designed continuous-focus electronic low vision aids with optical low vision aids in low vision rehabilitation. Methods In a prospective case-control study, 19 low vision patients and 14 blind patients used the optical low vision aids and the newly designed continuous-focus electronic low vision aids, respectively, while testing near visual acuity and reading newspapers. Near visual acuity, reading speed and reading duration were recorded and compared using a paired t test. Results The difference in near visual acuity was significant （t=-2.392, P〈O.05） for all patients when optical low vision aids were compared to near continuous-focus electronic aids. For blind patients and low vision patients, the difference in near visual acuity was also significant （t=-7.433, -8.721, P〈O.01）. The difference in reading speed was significant （t=-4.290, -6.728, P〈0.01） for all patients and blind patients when using optical low vision aids and near continuous-focus electronic low vision aids. The difference was not statistically significant for low vision patients alone （t=-1.534, P〉0.05）. For all patients, whether blind or low vision patients, the difference in reading duration was statistically significant （t=-8.211, -6.137, -6.007, P〈O.O1） when using the optical low vision aids and near continuous-focus electronic low vision aids. Conclusion The newly designed continuous-focus electronic low vision aid is more effective in improving patients＇ near visual acuity and reading ability.