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Zhonghua Yan Ke Za Zhi. 1999 Jan;35(1):40-2.

[Measurement and research of posterior chamber intraocular lens tilt and decentration in vivo].

[Article in Chinese]

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Department of Ophthalmology, Baogang Hospital, Shanghai Second Medical University, Shanghai 201900.



To observe the situation of implanted lenses in vivid eyes and postoperative visual acuity affected by the lens tilt and decentration.


64 eyes underwent extracapsular cataract extraction with posterior chamber lens implantation. Postoperatively, the lens tilt was measured by means of the 3(rd) and 4(th) Purkinje images, and the decentration of lenses was measured on the anterior segment photographs taken with a fundus camera.


The mean tilt was (6.95 +/- 2.46) degree, and the mean decentration, (0.66 +/- 0.28) mm. There were a significant differences in the tilt and decentration between the symmetrical bag/bag and asymmetrical bag/sulcus group (P < 0.001). Bag/bag group without tear had less average decentration 0.32 mm. When tilt was more than 9.65 degrees and decentration was more than 1.02 mm, the symptom such as glare or monocular diplopia was obvious.


These results indicate that in the bag without tear, the lenses have a perfect stability and consistent centration, and the tilt and decentration of the implanted lens affect postoperative visual quality in varying degrees.

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