landolt
美
英 
例句
Landolt 5: 1 C letters could not completely get rid of the interference of diffraction and crowding phenomenon.
藍氏5:1視標無法完全避開局部繞射的干擾及擁擠現象的影響。
Visual acuity test types - Specification for Landolt ring optotype for non-clinical purposes
視覺敏銳度測驗.非臨床用缺口環驗光字體規范