First human test of robotic eye surgery a success
Researchers from the University of Oxford have completed the first successful trial of robot-assisted retinal surgery.
Jun 18, 2018
0
1778
Researchers from the University of Oxford have completed the first successful trial of robot-assisted retinal surgery.
Jun 18, 2018
0
1778
After years of research, the first bionic eye has seen the light of day in the United States, giving hope to the blind around the world.
Feb 5, 2013
0
0
A team of medical scientists at the University of Electronic Science and Technology of China, working with a colleague from the Army Medical University and another from the Luzhou Maternal and Child Health Hospital, has found ...
Just three minutes of exposure to deep red light once a week, when delivered in the morning, can significantly improve declining eyesight, finds a pioneering new study by UCL researchers.
Nov 24, 2021
2
638
With the help of a quarter-million video game players, Princeton researchers have created and shared detailed maps of more than 1,000 neurons—and they're just getting started.
May 17, 2018
1
1792
Spots, flashes of light or darkness on any side of your vision could be a sign of eye floaters. Most often noticeable when looking at a plain, bright background, such as a blue sky or a white wall, eye floaters are a symptom ...
Jan 18, 2023
0
3
When it comes to some of the health hazards of light at night, a new study suggests that the color of the light can make a big difference.
Aug 6, 2013
3
0
Structures in the midbrain that developed early in evolution can be responsible for functions in newborns which in adults are taken over by the cerebral cortex. New evidence for this theory has been found in the visual system ...
Nov 30, 2011
7
0
Scientists have successfully regenerated cells in the retina of adult mice at the University of Washington School of Medicine in Seattle.
Jul 26, 2017
0
1731
For migratory birds and sea turtles, the ability to sense the Earth's magnetic field is crucial to navigating the long-distance voyages these animals undertake during migration. Humans, however, are widely assumed not to ...
Jun 21, 2011
18
0
The vertebrate retina is a light sensitive tissue lining the inner surface of the eye. The optics of the eye create an image of the visual world on the retina, which serves much the same function as the film in a camera. Light striking the retina initiates a cascade of chemical and electrical events that ultimately trigger nerve impulses. These are sent to various visual centers of the brain through the fibers of the optic nerve.
In vertebrate embryonic development, the retina and the optic nerve originate as outgrowths of the developing brain, so the retina is considered part of the central nervous system (CNS).. It is the only part of the CNS that can be imaged non-invasively in the living organism.
The retina is a complex, layered structure with several layers of neurons interconnected by synapses. The only neurons that are directly sensitive to light are the photoreceptor cells. These are mainly of two types: the rods and cones. Rods function mainly in dim light and provide black-and-white vision, while cones support daytime vision and the perception of colour. A third, much rarer type of photoreceptor, the photosensitive ganglion cell, is important for reflexive responses to bright daylight.
Neural signals from the rods and cones undergo complex processing by other neurons of the retina. The output takes the form of action potentials in retinal ganglion cells whose axons form the optic nerve. Several important features of visual perception can be traced to the retinal encoding and processing of light.
This text uses material from Wikipedia, licensed under CC BY-SA