Aim: The aim of the study was to compare the correlation between a cataract surgery and a change in the best corrected visual acuity, axial length and anterior chamber depth in patients with short, normal and long axial length, and also to determine the effect of cumulative dissipated ultrasound energy and estimated fluid used during the cataract surgery on biometric parameters. Study type: Prospective cohort study Patients and methods: The study included 30 patients of both sexes. The patients were divided in three groups, depending on the axial length (AL). The first group included patients with short AL (≤ 22,0 mm), the second group included patients with normal AL (22,01 – 25,0 mm) and the third group included patients with long AL (≥ 25,01 mm). Axial length, anterior chamber depth, keratometric parameters and the best corrected visual acuity were measured with ultrasound to each patient on the day of the surgery and one month after the intraocular lens implantation. The aim of the study was to analyse the difference between the measured variables before and after the surgery. Results: Comparing the results before and after the cataract surgery, there has been a significant progress in visual acuity after the surgery (Wilcoxon's test, P < 0,001), the anterior chamber depth has increased (Wilcoxon's test, P = 0,005), but there hasn't been any statistically significant difference in axial length in all three groups of patients (Wilcoxon's test, P = 0,10). The comparison among the groups revealed that there has been a significant increase in intraocular lens power in patients with short axial length compared to the ones with normal and long axial lenght (Kruskal Wallis test, P = 0,001), but the anterior chamber depth and the visual acuity do not show any significant difference among the groups (Kruskal Wallis test, P (ACD) = 0,62, P (VA) = 0,42). Conclusion: Cataract surgery leads to improvement in the best corrected visual acuity as well as to increasement of the anterior chamber depth, but has no statistically significant influence on changes of the axial length in patients with short, normal and long axial length.