410 - ATPL - Vitamin A and possibly vitamins B and C are chemical factors and essential to good night vision: 1. Vitamin deficiencies may decrease night vision performance 2. An excess intake of vitamin A will improve night vision performance significantly 3. Pilots should be carefully concerned to take a balanced diet containing sufficient vitamin A 4. Vitamin deficiencies may decrease visual acuity in photopic vision but not in scotopic vision

Question 410 - Human Performance and Limitations - ATPL - Airline Transport Pilot license