中文翻译与英英解释| A focometer is an instrument that measures refractive errors and is intended to provide rural or economically disadvantaged populations spherical eyeglass prescriptions without the need for complicated protocols, expensive equipment, or electricity. The focometer is monocular and hand-held, and is normally used in natural lighting. |
例句与用法 | 1. | Verification regulation of focometer
焦距仪检定规程
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