Miller R J
Department of Psychology, Washington State University, Pullman 99164-4820.
Percept Psychophys. 1991 Dec;50(6):575-83. doi: 10.3758/bf03207543.
Although diplopia is a frequently reported symptom of severe alcohol intoxication, there have been few past attempts to describe in any systematic fashion the specific impact of alcohol on fusion. In the present experiment, fusion latency was assessed for 8 male emmetropes. At the beginning of the alcohol condition, they consumed a drink containing 1.4 ml/kg of 95% ethanol, plus diluent. For the placebo condition, the drink consisted only of diluent. In each condition, fusion latency (the time required to fuse a binocularly visible target) was recorded for targets requiring a magnitude of vergence that varied from +10 through -2 meter angles, in 1-meter-angle steps. It was found that the far point of fusion approached the observer as a direct function of intoxication level. Furthermore, fusion latency increased for optically far and near targets as a systematic function of intoxication, with no effect of alcohol on intermediate targets. The results were consistent with previous findings of alcohol-induced narrowing of vergence range, suggesting that alcohol causes the farthest and nearest distances at which fusion latency is affected to approach an intermediate value. Measurable effects on fusion latency were observed with blood alcohol levels as low as 0.05%-0.06%, considerably below the legal limit for operating a motor vehicle in most states.
尽管复视是重度酒精中毒时经常报告的症状，但过去很少有人尝试以任何系统的方式描述酒精对融合的具体影响。在本实验中，对8名男性正视眼者的融合潜伏期进行了评估。在酒精状态开始时，他们饮用了一种含有1.4毫升/千克95%乙醇加稀释剂的饮料。在安慰剂状态下，饮料仅由稀释剂组成。在每种状态下，针对需要从+10到-2米角的不同聚散度幅度（以1米角步长变化）的目标，记录融合潜伏期（融合双眼可见目标所需的时间）。结果发现，融合远点随着中毒水平的直接函数而接近观察者。此外，随着中毒的系统函数，光学上远和近目标的融合潜伏期增加，而酒精对中间目标没有影响。这些结果与先前关于酒精引起聚散范围变窄的研究结果一致，表明酒精导致融合潜伏期受影响的最远和最近距离接近中间值。在血液酒精水平低至0.05%-0.06%时就观察到了对融合潜伏期的可测量影响，这大大低于大多数州驾驶机动车的法定限值。
