New research opens avenues for more efficient and stable blue OLED displays
New research from scientists at Durham University reveals an unexpected pathway toward brighter, more efficient, and more stable blue organic light-emitting diodes (OLEDs).
New research from scientists at Durham University reveals an unexpected pathway toward brighter, more efficient, and more stable blue organic light-emitting diodes (OLEDs).
Optics & Photonics
Feb 13, 2024
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68
Dr. Mark Lindsay was 5 years old when he first learned that tree trunks were brown.
Other
Jan 15, 2024
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1
Our lives are becoming increasingly data driven. Our phones monitor our time and internet usage and online surveys discern our opinions and likes. These data harvests are used for telling us how well we've slept or what we ...
Mathematics
Jan 8, 2024
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10
The AI models that power chatbots and other applications still have difficulty distinguishing between nonsense and natural language, according to a study released on Thursday.
Education
Sep 14, 2023
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1
When researchers set out to study 401(k) retirement savings accumulation, they found that thousands of studies of retirement savings accumulation ignored the surprisingly high rate of departing employees who cash out retirement ...
Economics & Business
Jul 20, 2023
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12
A team of marine biologist from James Cook University and University College London has found that blind cavefish living in dark caves in Mexico produce cells that are responsive to light. In their paper published in the ...
Children with visual impairment do not perceive the world in the same way as sighted people. As a result, they need specific educational tools, including children's books, that enhance their skills and senses. A team from ...
Education
Jun 6, 2023
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21
The British Ecological Society has published the results of a three-year randomized trial comparing double and single-anonymous peer review. The findings indicate a reduction in reviewer bias when author identities are anonymized.
Education
Apr 4, 2023
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10
A quartet of seismologists at The Australian National University, in Canberra, Australia, has found that an earthquake that struck near the town of Woods Point, in Victoria, Australia, back in 2021, was due to a blind fault. ...
Scientists' careers are defined by their contributions to the peer-reviewed literature. Yet, a study just out in Nature Ecology & Evolution by Michigan State University researchers reveals that peer review disadvantages some ...
Social Sciences
Mar 13, 2023
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6
Blindness is the condition of lacking visual perception due to physiological or neurological factors.
Various scales have been developed to describe the extent of vision loss and define blindness. Total blindness is the complete lack of form and visual light perception and is clinically recorded as NLP, an abbreviation for "no light perception." Blindness is frequently used to describe severe visual impairment with residual vision. Those described as having only light perception have no more sight than the ability to tell light from dark and the general direction of a light source.
In order to determine which people may need special assistance because of their visual disabilities, various governmental jurisdictions have formulated more complex definitions referred to as legal blindness. In North America and most of Europe, legal blindness is defined as visual acuity (vision) of 20/200 (6/60) or less in the better eye with best correction possible. This means that a legally blind individual would have to stand 20 feet (6.1 m) from an object to see it—with vision correction—with the same degree of clarity as a normally sighted person could from 200 feet (61 m). In many areas, people with average acuity who nonetheless have a visual field of less than 20 degrees (the norm being 180 degrees) are also classified as being legally blind. Approximately ten percent of those deemed legally blind, by any measure, have no vision. The rest have some vision, from light perception alone to relatively good acuity. Low vision is sometimes used to describe visual acuities from 20/70 to 20/200.
By the 10th Revision of the WHO International Statistical Classification of Diseases, Injuries and Causes of Death, low vision is defined as visual acuity of less than 6/18 (20/60), but equal to or better than 3/60 (20/400), or corresponding visual field loss to less than 20 degrees, in the better eye with best possible correction. Blindness is defined as visual acuity of less than 3/60 (20/400), or corresponding visual field loss to less than 10 degrees, in the better eye with best possible correction.
It should be noted that blind people with undamaged eyes may still register light non-visually for the purpose of circadian entrainment to the 24-hour light/dark cycle. Light signals for this purpose travel through the retinohypothalamic tract, so a damaged optic nerve beyond where the retinohypothalamic tract exits it is no hindrance.
This text uses material from Wikipedia, licensed under CC BY-SA