Clinical And Sonographic Factors Related To Visual Outcomes In Vitrectomy With Lensectomy Secondary To Pars Planitis.

Main: To evaluate the clinical and ultrasound characteristics by anterior segment ultrabiomicroscopy (UBM) in patients with pars planitis undergoing vitrectomy with lensectomy and their association with postsurgical visual outcomes.
Secondary:
- To describe the preoperative ultrasonographic findings of patients diagnosed with pars planitis who underwent vitrectomy with lensectomy.
- To classify patients subjected to studies, based on their postoperative best-corrected visual acuity.

Statistical analysis was performed in Microsoft Excel, comparing each dependent variable with the best-corrected visual acuity; by means of an association of categorical variables of paired and dependent groups. For each of the dependent variables a p value was obtained, which was considered statistically significant if it was <0.05.

Retrospective, observational and analytical study in which the electronic file and pre-surgical cabinet studies (UBM) of patients submitted to vitrectomy with lensectomy for pars planitis, belonging to Nuestra Señora de la Luz Hospital, during a period from January 2019 to July 2022, were analyzed.
Each of the clinical and ultrasound findings were quantified and statistically correlated with the best corrected visual acuity one month after surgery.

Patients were divided into 2 major groups according to their best corrected visual acuity (BCVA) following 1-2 months after surgery and the frequencies of findings per group were evaluated comparatively:
- Group 1, BCVA better than or equal to 20/60 (7 patients, 46.7%).
- Group 2, BCVA worse than 20/60 (8 patients, 53.3%).
For each dependent variable, an association of categorical variables of paired groups was performed and the following statistical associations were obtained for BCVA worse than 20/60:
- Presence of vitreous snowballs (P 0.0187)
- Presence of periphlebitis (P 0.004)
- Cyclic membrane extension greater than 3 meridians (UBM) (P 0.004)
- Membrane extension to pars plana (P 0.004) 

Inflammation as the axis of complications must follow the principle of "zero tolerance", since the clinical and ultrasound pre-surgical manifestations that result from it (presence of vitreous snowballs, presence of periphlebitis, cyclic membrane extension greater than 3 meridians (UBM) and membrane extension to pars plana) diminish the final visual capacity after vitrectomy with lensectomy secondary to pars planitis.