[Challenges of researches on visual acuity charts for near].

Near "words" visual acuity testing is implemented in clinics to meet the exams for read demanding. Therefore, diversity formats or versions of near "words or characters" visual acuity occur. However, near visual acuity chart with the mandarin character as basic target has been debated all the time. It is due to the complexity of the mandarin characters and the comprehensive of reading while having the meaningful characters as basic targets. This article will be focused on these debates.