Pierre Andrena, Wittich Walter, Faubert Jocelyn, Overbury Olga
Department of Psychiatry, McGill University Institute of Community and Family Psychiatry, and Department of Ophthalmology, Sir Mortimer B. Davis Jewish General Hospital, Montreal, Quebec, Canada.
J Cataract Refract Surg. 2007 Jul;33(7):1248-52. doi: 10.1016/j.jcrs.2007.03.024.
To determine whether yellow-tinted intraocular lenses (IOLs) negatively affect luminance contrast in postoperative cataract patients.
Department of Ophthalmology, Sir Mortimer B. Davis Jewish General Hospital, McGill University, Montreal, Quebec, Canada.
Luminance contrast was measured using the minimum-motion technique. The stimulus consisted of blue and red sinusoidal gratings differing in luminance. Patients had implantation of a clear or yellow-tinted IOL and were tested monocularly 2 to 9 weeks after cataract surgery. No patient had concomitant ocular diseases or congenital color defects, assessed by their ophthalmologist, or flicker-sensitive epilepsy. All patients had a visual acuity of 20/40 or better a mean of 4 weeks+/-2 (SD) postoperatively.
Patients ranged in age from 55 to 89 years. An independent-samples Student t test showed that patients with a yellow-tinted IOL had significantly lower luminance contrast values than patients with a clear IOL (P<.05).
The results suggest that yellow-tinted IOLs affect the perception of luminance under photopic conditions. More blue light was required to make luminance judgments with a yellow-tinted IOL than with a clear IOL. Further study of the functional impact of luminance reduction by yellow-tinted IOLs is warranted.
确定黄色人工晶状体（IOL）是否会对白内障术后患者的亮度对比度产生负面影响。
加拿大魁北克省蒙特利尔市麦吉尔大学犹太总医院莫蒂默·B·戴维斯爵士眼科部。
采用最小运动技术测量亮度对比度。刺激物由亮度不同的蓝色和红色正弦光栅组成。患者植入了透明或黄色人工晶状体，并在白内障手术后2至9周进行单眼测试。经眼科医生评估，所有患者均无伴随眼部疾病或先天性色觉缺陷，也无闪光敏感型癫痫。所有患者术后平均4周±2（标准差）时视力达到20/40或更好。
患者年龄在55至89岁之间。独立样本学生t检验显示，植入黄色人工晶状体的患者的亮度对比度值显著低于植入透明人工晶状体的患者（P<0.05）。
结果表明，黄色人工晶状体在明视觉条件下会影响亮度感知。与透明人工晶状体相比，使用黄色人工晶状体进行亮度判断需要更多的蓝光。有必要进一步研究黄色人工晶状体导致亮度降低的功能影响。
