CLINICAL OBSERVATION OF THE EFFECTIVE POSITION OF IOL AFTER CATARACT ULTRASONIC EMULSION EXTRACTION COMBINED WITH IOL IMPLANTATION

Yinan Gu^{1, *}, Weiping Jin² 

¹Department of Ophthalmology, Zhoushan Hospital of Zhejiang Province, Zhoushan, China - ²Department of Ophthalmology, Zhoushan Women and Children Hospital, Zhoushan, China

Objective: To study the displacement of the IOL in the visual axis direction and the corresponding changes in refractive error 3 months after cataract ultrasonic phacoemulsification extraction combined with IOL implantation.

Methods: Forty cataract patients (54 eyes) who underwent cataract ultrasound emulsion extraction combined with IOL implantation were collected and divided into 9 cases(12 eyes) in the high myopia complicated cataract group; 9 cases(10 eyes) in the age-related cataract group with type II diabetes; 22 cases(32 eyes) in the age-related cataract group. The central anterior chamber depth (ACD) as well as refractive error in the three groups were observed preoperatively, 1 week postoperative, 1 month postoperative, 2 months postoperative, and 3 months postoperative, and were statistically analyzed.

Results: The ACD of the three groups at 1 week postoperative was significantly greater than the preoperative ACD (P<0.05); 1 month and 2 months postoperative were not statistically different compared with 1week postoperative (P>0.05); the ACD at 3 months postoperative was significantly less than 1 week postoperative (P<0.05); there was no statistical difference in refraction between the three groups within 1week-2months postoperative (P>0.05); the refraction decreased significantly in the three groups at 3 months postoperative (P<0.05), showing myopic drift. The postoperative refractive error showed the same trend of reduction as ACD over time.

Conclusion: After cataract ultrasonic phacoemulsification extraction combined with IOL implantation, the anterior chamber depth increases significantly compared with the preoperative period, but with time, the anterior chamber depth decreases significantly, that is, the IOL in the operated eye moves forward. The postoperative refraction of the patient's eye will tend to decrease to a certain extent over time, which is manifested as myopic drift.