Aim: The aim of the study was to show the incidence of tear film instability after phacoemulsification cataract surgery in patients without previous tear film instability and to show the best corrected visual acuity on the day of the surgery and 30 days after the cataract surgery. Study type: Prospective cohort study Participants and Methods: The study included 30 patients of both genders with cataract, who underwent phacoemulsification cataract surgery and without previously present instability of the tear film. All patients underwent slit lamp anterior segment eye examination, fluorescein test, tear break up time test and visual acuity assessment on the day of the surgery and 30 day after the surgery. The difference in tear break up tests before and after the cataract surgery and the difference in visual acuity before and after the cataract surgery were examined. All patients underwent phacoemulsification cataract surgery followed by intraocular lens implantation performed by the same surgeon on INFINITY device (“Alcon” 2008). Results: After the cataract surgery median of the best corrected visual acuity was significantly better (1.0), while the tear break up test was significantly worse (median 8 s) in comparison to pre-surgery. After the surgery, correction was prescribed in 19 of 30 patients, median -0.75. Fluorescein test was positive after the surgery in 10 of 30 patients. 5 of 30 patients reported dry eye after the surgery. There was no significant difference in visual acuity considering the dry eye. Conclusion: After phacoemulsification cataract surgery visual acuity was significantly better, while the tear film quality was worse than before the cataract surgery.