Search results
Results From The WOW.Com Content Network
Learn about the three types of photoreceptor cells in mammalian eyes: rods, cones and intrinsically photosensitive retinal ganglion cells. Find out how they convert light into signals, how they are distributed in the retina and how they differ in spectral sensitivity and opsin expression.
For premium support please call: 800-290-4726 more ways to reach us
Learn about different styles and functions of eye protection gear, such as spectacles, goggles, welding helmets, hoods, face shields and respirators. Find out how to choose and use the right eye protection for various risks, such as impact, heat, UV, chemicals, lasers and glare.
Symptoms are redness and swelling of the eyes. Most often the condition is caused by prolonged exposure to Klieg lights, therapeutic lamps or acetylene torches. Other names for the condition include Klieg conjunctivitis, eyeburn, arc-flash, welder's conjunctivitis, flash keratoconjunctivitis, actinic ray ophthalmia, X-ray ophthalmia and ...
AOL Mail offers features like news, weather, security and spam-blocking for free. You can sign up for an AOL account and access your email on the go with an app or on the web.
Learn about the frequency at which a flickering light appears steady to the human eye, and how it depends on various factors such as intensity, wavelength, position, and adaptation. Find out how flicker fusion affects technologies such as cinema, TV, and lighting.
Hypotheses include Cherenkov radiation created as the cosmic ray particles pass through the vitreous humour of the astronauts' eyes, [4] [5] direct interaction with the optic nerve, [4] direct interaction with visual centres in the brain, [6] retinal receptor stimulation, [7] and a more general interaction of the retina with radiation.
Dry eye syndrome, also known as keratoconjunctivitis sicca, is a condition of having dry eyes that can affect vision and eye health. Learn about the causes, such as age, contact lenses, medications, and meibomian gland dysfunction, and the treatments, such as artificial tears, eye drops, and surgery.