In those early years writers frequently discussed the effects of television on family life. However, a curious myopia afflicted those early observers: almost without exception they regarded television as a favorable, beneficial, indeed, wondrous influence upon the family.

请问上文中的a curious myopia翻译成中文什么意思？在字典中，"myopia"只有"目光短浅；缺乏远见"的不可数名词的意思，不懂前面怎么可以加不定冠词"a"？看上下文，myopia又好像等于"they"。难道"a curious myopia"等于"一群目光短浅的人"？记得"一群特定的人"的话应该是"the+形容词"，像"the poor"之类的。