Related Experiment Video
Updated: Aug 11, 2025

09:11
Assessment of Global Ocular Structure Following Spaceflight Using a Micro-Computed Tomography Micro-CT Imaging Method
Published on: October 27, 2020
5.8K
Keratoconus and Fitness to Fly.
Aerospace Medicine and Human Performance
|February 9, 2023
Summary
Keratoconus, a vision condition, often allows pilots to continue flying careers with proper evaluation and management. Most aviators with this condition can maintain flight fitness after careful assessment.
Area of Science:
- Ophthalmology
- Aerospace Medicine
- Aviation Safety
Background:
- Vision is paramount for safe aviation.
- Keratoconus causes progressive vision impairment, jeopardizing aviator careers.
- Aeromedical significance of keratoconus necessitates careful evaluation.
Purpose of the Study:
- To analyze keratoconus cases in pilots.
- To discuss flight waiver decisions for aviators with keratoconus.
- To assess the impact of keratoconus on aviation careers.
Main Methods:
- Retrospective study of aviator records.
- Analysis of 19 pilots examined at an Aeromedical Center over 5 years.
- Review of flight fitness waiver outcomes.
Main Results:
- 19 pilots (13 line, 6 military) with keratoconus were analyzed.
- Two pilots did not receive flight waivers.
- 17 pilots received waivers, with 5 requiring vision correction (glasses/contacts).
Conclusions:
- Keratoconus requires detection by aeromedical examiners.
- Flight licenses are possible if keratoconus is stable and visual quality is satisfactory.
- Double pass aberrometry may aid in determining flight fitness; case-by-case analysis is crucial.
Related Concept Videos
Focusing of Light in the Eye
3.0K
Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
3.0K
Accessory Structures of the Eye
1.7K
Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
1.7K
Photoreceptors and Visual Pathways
6.2K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
6.2K
Glaucoma: Overview
672
Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
672
Prosopagnosia
223
Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
223
Angle Closure Glaucoma: Treatment
604
Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
604

