Cullinan T R, Silver J H, Gould E S, Irvine D
Lancet. 1979 Mar 24;1(8117):642-4. doi: 10.1016/s0140-6736(79)91082-1.
13 men and 43 women (average age 76) attending a low-vision clinic with visual acuity of 6/18 (Snellen) or less had acuity measurements made under standard (measured) hospital conditions, under normal home conditions, and under home conditions with augmented lighting. Median levels of ambient lighting in the home were 1/10 of those in hospital, while levels for reading were 1/7. Augmented lighting at home (a 60 watt bulb in a small adjustable lamp) improved visual acuity in 82% of subjects, restoring all but 11% to the levels achieved in hospital or above. Improvement was unrelated to disease. General levels of lighting are often so poor in the homes of elderly people that the number of people functioning as "blind" is twice what it need be. Simple improvements to lighting would reduce the prevalence of "visual disability" (less than 6/18 Snellen) from 520/100,000 home-based adults to about 300.
13名男性和43名女性（平均年龄76岁）前往一家低视力诊所就诊，他们的视力为6/18（斯内伦视力表）或更低。这些患者分别在标准（测量）的医院环境、正常家庭环境以及增加照明的家庭环境下进行了视力测量。家庭环境中的平均环境光照水平是医院的1/10，而阅读时的光照水平是医院的1/7。在家中增加照明（一个小型可调节灯具中的60瓦灯泡）使82%的受试者视力得到改善，除11%的人外，其余所有人的视力都恢复到了在医院所达到的水平或更高。视力改善与疾病无关。老年人家庭中的一般光照水平往往很差，以至于“失明”的人数是应有的两倍。简单改善照明将使“视力残疾”（低于6/18斯内伦视力表）的患病率从每10万名居家成年人中的520例降至约300例。
