ver.gence

n.（名詞）
A measure of the convergence or divergence of a pair of light rays, defined as the reciprocal of the distance between a point of reference and the point at which the rays intersect.
光折射度數(shù)：一對(duì)光線聚合或發(fā)散的計(jì)量單位，定義為參照點(diǎn)與光線交叉點(diǎn)之間距離的倒數(shù)
The inward or outward turning of one or both eyes that occurs when focusing on an object.
注視點(diǎn)：目光集中在一個(gè)物體上時(shí)，單顆或兩顆眼珠向內(nèi)或向外的轉(zhuǎn)動(dòng)