验光字体 meaning in English

optotype

Ophthalmic optics . visual acuity testing . standard optotype and its presentation
眼科光学.视觉敏锐度测验.标准验光字体及其演示
Visual acuity test types - method for correlating optotypes used for non - clinical purposes
视觉灵敏度检验字体.非医院用有关验光字体法
Visual acuity test types - specification for landolt ring optotype for non - clinical purposes
视觉敏锐度测验.非临床用缺口环验光字体规范
Optics and optical instruments . visual acuity testing . method of correlating optotypes
光学和光学仪器.视觉敏锐度测试.相关的验光字体法