The optic tract, which crosses the crus, may also be affected, and hemianopia result.    From Wordnik.com.  [Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.] Reference

People with hemianopia have difficulty detecting pedestrians, study cautions against allowing them to drive.    From Wordnik.com.  [THE MEDICAL NEWS] Reference

A homonymous hemianopia, or in other words, damage of the left visual field, is illustrated in the picture below.    From Wordnik.com.  [Yvonne Foong: Fighting NF] Reference

Investigative Ophthalmology and Visual Science, fly in the face of some recent on-road studies that have found most people with hemianopia safe to drive.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

In at least 22 states and many other countries, people with hemianopia are prohibited from driving because they do not meet the visual field requirements for licensure.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

More than a million people suffer from hemianopia, a condition in which one half of the visual field in both eyes is blinded, usually the result of a stroke or head injury.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

They also found a large variability in blind-side detection rates among the individuals with hemianopia (from 6% to 100%) with the lower rates found among the older subjects.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

"Our study urges caution in opening the door for people with hemianopia to start or continue driving again," says first author, Dr. Alex Bowers, who is an Assistant Scientist at Schepens.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

The next step for the team is to determine whether an optical aid that expands the visual field - peripheral prism (expansion prism EP) glasses - might be a useful device for drivers with hemianopia.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

These results, published in the November 2009 issue of Investigative Ophthalmology and Visual Science, fly in the face of some recent on-road studies that have found most people with hemianopia safe to drive.    From Wordnik.com.  [Medindia Health News] Reference

The scientists found that drivers with hemianopia had much lower detection rates on their blind side than normally sighted subjects (or their own seeing side), detecting on average only about 45% of pedestrian figures.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

Specifically, they plan to conduct another driving simulator study to investigate whether drivers with hemianopia have better detection rates for pedestrians on the blind side when using the glasses than when driving without them.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

She and Peli believe the Schepens study, because it was conducted in the safety of a driving simulator over a longer period of time and "miles" than a typical "on-road" study, provides new insights into detection failures of drivers with hemianopia.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

Lesions implicating the cortical centre for sight in the occipital lobe give rise to hemianopia -- that is, loss of sight in the lateral halves of the fields of vision of both eyes -- colour-blindness, subjective sensations of light and colour, and other eye symptoms.    From Wordnik.com.  [Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.] Reference

Schepens Eye Research Institute scientists have found that -- when tested in a driving simulator -- patients with hemianopia (blindness in one half of the visual field in both eyes) have significantly more difficulty detecting pedestrians (on their blind side) than normally sighted people.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

Although overall most subjects with hemianopia had detection rates that seem incompatible with safe driving, Bowers cautions that "the relationship of our simulator detection performance measures to on-road performance has yet to be established, another reason to treat each person with hemianopia individually as they seek approval to get back on the road.".    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

Title: Study Finds Many People With hemianopia Have Difficulty Detecting Pedestrians While Driving, Advocates for Individual Testing Description: Scientists at Schepens Eye Research Institute have found that -- when tested in a driving simulator -- patients with hemianopia (blindness in one half of the visual field in both.    From Wordnik.com.  [Medindia Health News] Reference

Homonymous hemianopia, 335.    From Wordnik.com.  [Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.] Reference