Neumann A C, McCarty G R, Steedle T O, Sanders D R, Raanan M G
Neumann Eye Institute, DeLand, Florida 32720.
J Cataract Refract Surg. 1988 Jan;14(1):35-9. doi: 10.1016/s0886-3350(88)80061-0.
One hundred six cataractous eyes of 78 patients were evaluated to examine the relationship between indoor and outdoor Snellen visual acuity. While 81 of all cataractous eyes (76.4%) had Snellen visual acuities of 20/40 or better when tested indoors, only 33 eyes (31.2%) had 20/40 or better Snellen visual acuities when tested outdoors facing the sun. When tested indoors, only three eyes (2.8%) had Snellen visual acuities worse than 20/80, while 31 eyes (29.2%) had outdoor Snellen visual acuities worse than 20/80. Ten eyes (9.4%) had outdoor Snellen visual acuities worse than 20/200. Seventy-four eyes (69.8%) had outdoor visual acuities that were at least two Snellen lines worse than those measured indoors and 23 eyes (21.7%) had outdoor visual acuities that were at least five Snellen lines worse. The median difference between indoor and outdoor visual acuity was three Snellen lines. The need for increased precision in the ability to assess outdoor "real world" vision while in the ophthalmologist's examination room is discussed. Clearly, indoor Snellen visual acuity alone is insufficient to evaluate functional visual impairment in cataract patients.
对78例患者的106只白内障患眼进行评估，以研究室内和室外Snellen视力之间的关系。在所有白内障患眼中，81只眼（76.4%）在室内测试时Snellen视力为20/40或更好，而在面向太阳的室外测试时，只有33只眼（31.2%）的Snellen视力为20/40或更好。在室内测试时，只有3只眼（2.8%）的Snellen视力低于20/80，而在室外测试时，有31只眼（29.2%）的Snellen视力低于20/80。10只眼（9.4%）的室外Snellen视力低于20/200。74只眼（69.8%）的室外视力比室内测量的视力至少差两行Snellen视力，23只眼（21.7%）的室外视力比室内测量的视力至少差五行Snellen视力。室内和室外视力的中位数差异为三行Snellen视力。讨论了在眼科医生检查室评估室外“真实世界”视力时提高精度的必要性。显然，仅靠室内Snellen视力不足以评估白内障患者的功能性视力损害。
