Frey F G
Klin Monbl Augenheilkd. 1975 Jul;167(1):125-7.
Holmgren's supposition that colour blindness was one of the causes for the train-disaster which happened on 15th November 1875 near Lagerlunda had been passed on as an established fact. The course of the accident is outlined on the basis of the court records. It shows that not colour blindness, but the fact that the engine-driver and the station-master were acting contrary to regulations resulted in the head-on collision with the opposite train. After this event systematic testing of colour vision in railway-men was instituted and the methods of examination were considerably improved.
霍尔姆格伦认为色盲是1875年11月15日发生在拉格伦达附近火车事故的原因之一，这一推测已作为既定事实流传开来。事故经过根据法庭记录进行了概述。结果表明，导致与对面火车正面相撞的原因不是色盲，而是火车司机和站长违反规定的行为。此次事件之后，铁路工作人员开始进行系统的色觉测试，检查方法也有了很大改进。
