Abstract:

 Objective To compare axial length and refraction before and after cataract surgery. To guide on the spectacle prescription time and reserved refractive outcome after surgery. Design Prospective case series. Participants 30 patients (37 eyes) underwent phacoemulsification cataract extraction with IOL implantation. Methods All the patients were separated into two groups. Group of over-long axial length included 15 patients(17 eyes) with axial length 29.71～32.89 mm and group of normal axial length included 15 patients(20 eyes) with axial length 22.16～25.54 mm. The axial length was measured by IOLMaster preoperatively and postoperatively at 1 day, 1 week, 1 month, 3 months. Refraction was also measured at 1 week, 1 month and 3 months after surgery. All the data were analyzed in the randomized block design with the SPSS 17.0 statistical software package. Main Outcome Measures Axial length and refraction. Results The axial length in group of over-long axial length was (31.07±1.02)mm preoperatively and was(30.60±0.88)mm 3 months postoperatively, and the difference was statistically significant. The axial length in group of normal axial length was(23.51±0.78)mm preoperatively and (23.37±0.75)mm 3 months postoperatively, and the difference was also statistically significant. The refraction in group  of over-long axial length was (-3.78±0.68)D 1 day postoperatively and was (-3.01±0.55)D 1 month postoperatively, and the difference was statistically significant. The refraction in group of normal axial length was (-0.53±0.10)D 1 day postoperatively and was (-0.40±0.07) D 1 week postoperatively, and the difference was also statistically significant. The difference in axial length has no statistical significance between 1 month (30.61±0.90 mm) and 3 months(30.60±0.88 mm) postoperatively in group of over-long axial length, and among 1 week(23.38±0.79 mm), 1 month(23.38±0.78 mm) and 3 months(23.37±0.75 mm) postoperatively in group of normal axial length. The difference in refraction has no statistical significance between 1 month and 3 months(-3.03±0.54)D postoperatively in group of over-long axial length, and between 1 week, 1 month(-0.42±0.11)D and 3 months(-0.41±0.08)D postoperatively in group of normal axial length. Conclusion The axial length shortened after phacoemulsification cataract extraction with IOL implantation, especially in over-long axial length eyes. The axial length and refraction both stabilized in 1 month in group of over-long axial length, while in 1 week in group of normal axial length. （Ophthalmol CHN，2016，25： 90-93）

Key words:  cataract/surgery, axial length, refracion； IOL Master