## 4 Discussion  
The purpose of this study was to highlight the relationship between the visual system and the stomatognathic system. Some authors have published interesting works about this subject but have generally focused on one malocclusion condition or another [5; 15]. Our work brings a comprehensive correlation of different ocular disorders and malocclusions presented in the sagittal, transversal and vertical planes. We tried to clarify for the health community the importance of understanding the human being not in a compartmentalized state, but as an integrated group of systems that communicate each other. Problems that occur in the visual system can result in consequences of imbalances in the stomatognathic system or vice versa. It was also emphasized the relevance of including oculist-orthoptic exams of the protocol of stomatognathic system evaluation, to support preventive interventions in a pediatric population. Our work showed an enhanced prevalence of refractive defects, fusional vergence defects and alteration saccadic eye movements and pursuit movements, in almost all dental malocclusions. These findings can be reinforced by the results presented in a study that demonstrate the improvement of symmetry in the orbital and maxillary regions in patients after rapid maxillary expansion [20]. In sagittal malocclusions, refractive defect myopia were found in 61.54% of the patients presenting Class II malocclusion, while control group showed 23.53% of prevalence. They also presented alterations of the ability of saccadic movements two times bigger than control group. [PERSON] had also demonstrated a statistically significant association between Class II and the occurrence of exodeviations, associating occlusal molar Class II to fusional vergence defects [21]. In relation to refractive vices we are in agreement with [PERSON] et al. as they found a greater prevalence of refractive defects in patients with sagittal malocclusions too [22]. However, the higher prevalence of strabismus in the Class II group found in our sample, where children with latent or manifested strabismus were almost four or three times more represented, (40.38% vs. 11.54%, \(p<0.01\); 36.54% vs. 11.54%, \(p<0.01\), respectively), is not in accord to [PERSON] work, since they did not find an enhancement in the vergence capacity. It indicates that further investigations are necessary, expanding the sample examined, to be able to demonstrate and better understand this divergence of results. For Class III patients we found a huge statistical difference (5 times more) in the prevalence of astigmatism and strabismus. It was interesting to note from our results that the values of a fusional amplitude below the normal range and an alteration of the abilities of saccadic movements presented themselves with very similar percentages in almost all malocclusions. It is also important to highlight that body compensations presented by patients with sagittal malocclusions were three times bigger when compared to the control group. Many works had demonstrated that vision influences body posture and also there is a correlation between mandibular position and body posture [23; 24; 25; 26; 27]. In our sample is impossible to determine if the malocclusions generated a body compensation, if the visual problem was the cause of it or if both were related to the observed increase in posture alteration. Specific design of investigation must be done to clarify this finding. Patients with transverse malocclusion or crossbite have refractive defects almost exclusively represented by astigmatism. The prevalence was almost five times bigger than control. The group also showed a prevalence of strabismus three times bigger than control, showing alteration in the saccades ability. Referring to astigmatism, we are in accord to with [PERSON] [22]. In their study they have specifically reported statistically significant correlations between astigmatism and crossbite.