Current guidelines in aviation ophthalmology and challenges: A review

Aviation ophthalmology is an unexplored branch of ophthalmology. This specialized field combines the principles of ophthalmology and aerospace medicine to ensure optimal visual performance and ocular health in aircrew for safer flights. The unique stressors encountered in flight, such as rapid acceleration, hypoxia, glare, and sudden changes in lighting, can significantly affect visual performance. Thus, ophthalmologic evaluation forms a critical component of medical fitness assessments for flying personnel. Given the visually demanding and high-risk environment of aviation, maintaining strict visual standards is crucial for flight safety. However, controversies still exist in the different governing bodies that are responsible for aviation visual requirements. This review article aims to present a comprehensive overview of the visual standards, common ophthalmic disorders affecting aviators, and controversies in aviation ophthalmology. It discusses in detail the visual tasks essential in flight-such as distance and near visual acuity, color perception, depth judgment, contrast sensitivity, and night vision-and the minimum standards set by regulatory authorities like the Directorate General of Civil Aviation (DGCA), Federal Aviation Administration (FAA), and others. It also highlights ocular diseases disposal in aviation.