The problem of this doctoral thesis lies in the fact that the emphasis in testing the protective role of the ski helmet was mainly on reducing the impact of the forces on the head with the aim of minimizing the risk of injury. However, this does not take into account potential vision limitations that can significantly affect the reduced response to visual stimuli in the situational conditions of alpine skiing. Despite the fact that the usage of ski helmets increases, it is still elusive if the frequency of head injuries decreased significantly. One of the reasons may be in the fact that ski helmets in combination with ski goggles influence the width of the visual field and potentially decrease the speed of the skier's reaction to external visual stimuli. In order to investigate this problem, integrated laboratory and field testing protocols were conducted on the same group of participants. The students of the Faculty of Kinesiology (n=45) who completed at least the elementary school of alpine skiing participated in the study as part of the regular course "Skiing" and the specialization "Skiing". Also, the research included respondents who have developed a habit of wearing a ski helmet (n=22) and those who have not developed this habit (n=23) in order to determine potential differences between them in the test results. Five combinations of wearing head protective equipment were tested (control condition – ski cap, ski cap and sunglasses, ski cap and ski goggles, ski helmet and sunglasses, ski helmet and ski goggles). For the purposes of laboratory research, an orthoreter device was used to test the visual field based on the 28-point Perimetry test, and the WITTY photocell system was used to measure reaction speed directly on the field, i.e. on the ski slope. Based on the obtained results of laboratory testing of the visual field size, it can be concluded that the habit of wearing a helmet does not affect the reduction of the skier's visual field, but there are significant differences between the each condition of wearing head protective equipment in the interference they represent for the peripheral vision of recreational skiers. The results of the on-the-field part of the research on the ski slope aimed at determining the time required to react to a visual stimulus show that there are statistically significant differences between the group of respondents who have the habit of wearing a helmet and the group of respondents who have not acquired the habit of wearing a ski helmet. Furthermore, statistically significant difference was obtained between the tested conditions of wearing protective head equipment. When observing the results of the combined influence of protective headgear and the habit of wearing a ski helmet, it was found that there is a statistically significant interaction between the group of respondents and the tested conditions. Namely, a statistically significant difference was found between the results of helmet non-users and users in the condition of wearing a ski helmet and ski goggles, in favor of a better result, i.e. faster reactions in respondents who usually wear a ski helmet. Presented results suggest a significant influence of certain combinations of wearing head protective equipment (control condition vs. 4 experimental conditions and between individual experimental conditions) on the determined size of the visual field, i.e. the perception of stimuli in the peripheral visual field and on the reaction time to visual stimulus. Depending on the particular combination of wearing protective equipment, the influence is more or less pronounced in terms of a negative trend in the results compared to the control condition. Also, ski goggles proved to be a greater limiting factor compared to the ski helmet itself, in both parts of visual perception research - stimulus localization in the visual field and the time required to react to peripheral visual stimuli. The obtained results bring new scientific and practical knowledge related to potential risks related to vision and reaction time when wearing protective equipment in alpine skiing despite its undisputed numerous users. Although wearing a helmet is generally recommended for safety reasons, skiers should also be aware of the potential impact on reaction time and visual field and have to adjust their technique and equipment accordingly to ensure optimized visibility and safety on the slopes.