Creswell K A, Brisbin S D, Toma D M, Reddon J R
Creswell Chiropractic Centre, Canada.
Percept Mot Skills. 1994 Dec;79(3 Pt 2):1535-8. doi: 10.2466/pms.1994.79.3f.1535.
Three subjects were used to compare superior visual-field threshold for 5 North American industry-standard opaque safety hard hats with a prototype clear translucent-visor safety hard hat and a no-hat baseline condition. Average maximum degrees of superior visual field was equivalent for the clear-visor safety hat and no-hat conditions (52.0 degrees versus 48.3 degrees) but the opaque-visor safety hats resulted in only 15.1 degrees. The opaque safety hats were worse than the clear-visor safety hat and no-hat conditions by, on the average, an order of 3. Analysis indicated that visual-field obstruction is a potential problem for wearers of opaque safety hats. Field research will be required to assess the extent of injuries caused by an impaired superior field of vision when wearing opaque-safety-hat visors. The potential positive effects of the clear-visor safety hat on reduction of accidents also must be determined.
选取了三名受试者，将5种北美行业标准的不透明安全帽与一款带有透明半透明面罩的安全帽原型以及不戴安全帽的基线条件进行比较，以测定上视野阈值。透明面罩安全帽和不戴安全帽条件下的平均最大上视野度数相当（分别为52.0度和48.3度），但不透明面罩安全帽的平均最大上视野度数仅为15.1度。不透明安全帽比透明面罩安全帽和不戴安全帽的条件平均差了约3倍。分析表明，视野受阻对于不透明安全帽佩戴者来说是一个潜在问题。需要进行实地研究，以评估佩戴不透明安全帽面罩时上视野受损所导致的伤害程度。还必须确定透明面罩安全帽在减少事故方面的潜在积极影响。
