Effect of vitrectomy on lens suspensory ligament and depth of anterior chamber

Objective To analyze the effect of vitrectomy on lens suspensory ligament and depth of anterior chamber in cataract patients. Methods The data of 86 eyes of 80 patients with cataract from Jan.2014 to Dec.2016 were analyzed retrospectively. They were divided into operation group of 46 cases and control group of 40 cases according to the history of vitrectomy. The depth of anterior chamber was measured with ophthalmic optical biometrics, and the lens suspensory ligament was measured with panoramic ultrasound biomicroscopy. The differences were compared between the two groups. Results The average distance from ciliary process to equator of crystal and the anterior chamber depth in operation group were (1.08±0.22) mm, (3.22±0.37) mm, respectively and (0.77±0.22) mm, (3.50±0.41) mm in the control group respectively. The difference were statistically significant between the two groups (t=7.940, -3.876, P=0.000, 0.000). The difference in average length of the suspensory ligament in patients with different axial length was statistically significant (P=0.000). The difference in anterior chamber depth in patients with axial length ≥29 mm was statistically significant between the two groups (t=-4.931, P=0.000). But the difference in eye length < 29 mm was not statistically significant between the two groups (t=-0.983, -1.345, P=0.328, 0.182). Conclusion Vitrectomy can increase the length of lens suspensory ligament and reduce anterior chamber depth in cataract patients, and it has a certain relationship with the length of the eye. Key words: Cataract; Vitrectomy; Suspensory ligament, lens; Depth, anterior chamber; Axial length