Abstract: Objective To measure and compare the position of different designed intraocular lens (IOL) location in the capsular bag after implantation. Design Retrospective case series. Participants A total of 120 eyes （120 cases）were continuously acquired in Dec 2019, six months after cataract surgery. All these cases were operated in Beijing Tongren Eye Center. Methods According to the different design of the implanted IOL, the patients were divided into A, B and C group, with 40 patients (40 eyes) in each group. Uncorrected visual acurity (UCVA) and best corrected visual acurity (BCVA) was measured. The IOL decentration and the degree of IOL tilt was measured using anterior segment sweep source optical coherence tomography(AS-SS-OCT). The distance between the IOL center and the middle point of the line between the scleral process is the IOL decentration, and the angle between the IOL plane and the plane of the scleral process is the degree of IOL tilt. Main Outcome Measures Decentration and tilt of IOLs in horizontal and vertical position. Results In group A, the horizontal decentration distance was (0.24±0.07) mm (0.11~0.39 mm) and horizontal tilt angle was (1.41±0.64)° (0.48~2.68°); the vertical decentration distance was (0.23±0.08) mm (0.11~0.47 mm) and vertical tilt angle was (1.79±0.91)° (1.02~4.72°). In group B, the horizontal decentration distance was (0.23±0.08) mm (0.11~0.43 mm) and horizontal tilt angle was (1.59±1.19)° (0.44~3.61°); the vertical decentration distance was (0.23±0.07) mm (0.14~0.41 mm) and vertical tilt angle was (2.09±1.31)° (0.56~5.04°). In group C, the horizontal decentration distance was (0.28±0.12) mm (0.13~0.49 mm) and horizontal tilt angle was (1.86±1.21)° (0.26~3.71°); the vertical decentration distance was (0.31±0.17) mm (0.23~0.46 mm) and vertical tilt angle was (2.01±1.01)° (0.61~4.86°). All the data showed no significant difference in two groups (all P>0.05). The UCVA and BCVA showed no significant difference in three groups, and no case complained glare or holes. Conclusion The decentration and tilt of IOL might not be related to the type of IOL implanted. It did not lead to adverse visual effects under the conditions with the IOL decentration <0.5 mm and the tilt degree <5°.

Key words: cataract phacomulcification, intraocular lens, opitcal coherence tomography, decentration, tilt