Editing Vitamin A (section)

====Night blindness====
{{Main|Nyctalopia}}
Vitamin A deficiency-caused [[Nyctalopia|night blindness]] is a reversible difficulty for the eyes to adjust to dim light. It is common in young children who have a diet inadequate in retinol and β-carotene. A process called [[Adaptation (eye)|dark adaptation]] typically causes an increase in photopigment amounts in response to low levels of illumination. This increases light sensitivity by up to 100,000 times compared to normal daylight conditions. Significant improvement in night vision takes place within ten minutes, but the process can take up to two hours to reach maximal effect.<ref name="Wolf2001"/> People expecting to work in a dark environment wore red-tinted goggles or were in a red light environment to not reverse the adaptation because red light does not deplete rhodopsin versus what occurs with yellow or green light.<ref name="Miller">{{cite journal |url=https://apps.dtic.mil/sti/citations/ADA257059 |archive-url=https://web.archive.org/web/20220104192142/https://apps.dtic.mil/sti/citations/ADA257059 |url-status=live |archive-date=4 January 2022 |title=Night Vision Manual for the Flight Surgeon|vauthors=Miller RE, Tredici TJ |date=1 August 1992 |website=US Department of Defense, Defense Technical Information Center |access-date=4 January 2022}}</ref>