In considering the execution of a civil or military operation, the helicopters are indispensable for the activities such as personnel and material transportation, airborne force, and medical evacuation. In the operations where predominance and confidentiality are prioritized, night-time use becomes important, and night vision systems play an essential role in turning the night into an advantage. For this reason, helicopter and night vision goggle flights are increasing. The time interval during which the night flights were performed, and the additional equipment installed led to fatigue. Fatigue, in terms of aviation, leads to problems such as loss of attention, difficulty in concentration, and erroneous decision- making. This study aimed to improve some of the constraints created by the flying equipment on night flights. The questionnaire designed to evaluate the properties of night vision goggles is based on the literature. Different phosphor types (white and green) were obtained from the related companies. The pilots were asked to indicate the severity of all types of night vision goggles, depth perception, contrast sensitivity, distance estimation sensitivity, halo effect, body fatigue, the severity of neck pain, and eye strain. This study determined the cognitive fatigue of the pilots performed by using different types of night vision goggles and to reveal the results of this situation. Although the white phosphatized night vision goggles gave better results than green phosphorized night vision goggles, such as distance estimation, depth perception, etc., different environmental flight environments (such as snow- covered terrain, frequent forests) and longer duration for determining the effects of different task types flight tests are required.