Snellen视力表的标准测试距离为

Which of the following are the instrument for visual acuity test? A: Snellen visual chart B: ETDRS visual chart C: Perimeter D: Auto-refractor

Which of the following best-corrected visual acuity is normal? A: 0.1 (decimal unit) B: 20/40 (Snellen) C: 0 (LogMAR) D: 1.0 (LogMAR)

Which<br/>of the following are the instrument for visual acuity test? () A: Snellen<br/>visual chart B: ETDRS<br/>visual chart C: Perimeter D: Auto-refractor

Which<br/>of the following best-corrected visual acuity is normal? A: 0.1 (decimal unit) B: 20/40 (Snellen) C: 0 (LogMAR) D: 1.0 (LogMAR)

下面哪种视力表不是对数设计的视力表 A: snellen视力表 B: 标准对数视力表 C: EDTRS视力表 D: Bailey-lovie视力表