Navigation Links
Some People Can't Stomach the New 3-D Movies

Ills triggered by films may suggest the need for an eye exam

THURSDAY, April 8 (HealthDay News) -- The new crop of 3-D movies hitting theaters are making some people sick -- literally.

It's not the alien creatures bleeding off the screen or half-eaten humans spit out in your direction by fierce dragons. It's just the way 3-D plays tricks on your brain, mimicking symptoms of motion sickness.

The problem, if you have one, may lie in your head and, in particular, your eyes, experts note.

An unlucky (or lucky, depending on your point of view) 5 percent of the population have such bad eye coordination they can't perceive 3-D at all. But if these people decide to plunk down $20 for Avatar or Alice in Wonderland, at least they won't get a headache.

"In 3-D movies, your eyes have to be working together as a team perfectly. You have to have equally clear images in both eyes," explained Dr. James J. Salz, spokesman for the American Academy of Ophthalmology and clinical professor of ophthalmology at the University of Southern California in Los Angeles. "Then you will get the fusion of the two images."

Getting the 3-D effect involves using two different cameras projecting two images on top of each other to create depth perception. Salz's former partner, Dr. Julian Gunzberg (now deceased), developed the original 3-D technique used in House of Wax with Vincent Price.

An estimated 30 percent of moviegoers have enough eye coordination to see 3-D, but only with a struggle. These are the ones more likely to get headaches and eye fatigue while watching 3-D on the big screen, said Jeffrey Anshel, an optometrist with VSP Vision Care and the principal of Corporate Vision Consulting in Encinitas, Calif.

"The problem comes in with people who have 3-D vision but have a weak fusional mechanism," Salz explained. "Your eyes are having to work harder. The brain is sending extra impulses to keep the eyes in alignment. If you're asking your eyes to fuse in 3-D all the time, you will feel the extra strain, the motion sickness."

"Avatar is asking your eyes to fuse and do the extra work for two hours and 40 minutes. It's not surprising there are some unhappy with [their] experiences," Salz added.

The brain is further confused by conflicting input from different parts of the body -- the eyes, the pressure receptors on your extremities and the vestibular system in the inner ear, explained Dr. Robert Wiprud, an associate professor of family and community medicine at Texas A&M Health Science Center College of Medicine and director of family medicine at the Scott & White Clinic in College Station, Texas.

The vestibular system includes hair cells resting in fluid that detect sound and head movement. "When we move in a certain direction, the fluid moves the hair cells, creating an electrical impulse that travels along the eighth cranial nerve to the brain, and the brain can tell if you're sitting still or moving forward," Wiprud explained.

"Most of the time, all that information adds up and makes sense to your brain," he said. "But when you go to a realistic 3-D movie, you get a conflict between what the eyes are seeing and what the vestibular system is sensing. Your eyes are telling you that you're flying through the air while your vestibular system is saying, 'No, we're just sitting here.' It gives you a false sense of movement which, in people who are sensitive, can lead to nausea and headache."

"Your brain hates conflicting signals. A regular movie doesn't fool your eyes as much," said Wiprud, who has avoided seeing Avatar for fear of the consequences.

Die-hard movie fans might benefit from dramamine or other motion-sickness medications, or you could take it as a clue that your eyes need a full exam, Anshel said.

For now, you still have to go to a theater to experience the stomach-churning realism of 3D. Soon, though, you may have the luxury of getting sick in your living room, because 3-D television is on its way.

More information

The U.S. Centers for Disease Control and Prevention has more on motion sickness.

SOURCES: Robert Wiprud, M.D., associate professor, family and community medicine, Texas A&M Health Science Center College of Medicine, and director, family medicine, Scott & White Clinic in College Station, Texas; Jeffrey Anshel, OD, optometrist, VSP Vision Care provider and principal, Corporate Vision Consulting, Encinitas, Calif.; James Salz, M.D., spokesman, American Academy of Ophthalmology, and clinical professor, ophthalmology, University of Southern California, Los Angeles

Copyright©2010 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. BMI of Texas Offers Free Educational Seminars in San Antonio for People Considering Weight Loss Surgery
2. Oral Vaccine May Help People With COPD
3. PeopleStreme Collaborates with SkillSoft for Learning Management Content
4. New Book Offers Final Answer to 'What's for Dinner?' for People with Diabetes and Those Who Love Them
5. Powerful People Often Too Optimistic About Task Time
6. Autism Society Kicks Off National Autism Awareness Month to Honor the 1 in 110 People with Autism in the United States
7. Safeway's People with Disabilities Campaign Means Business
8. Canadian research team awarded international grant for work on Indigenous peoples health
9. Older people and those with HIV are more vulnerable to tuberculosis
10. Free Anti-Aging Teleseminar Teaches People Key Lifestyle Changes To Maximize Longevity
11. Cognition declines 4 times faster in people with Alzheimers disease than those with no dementia
Post Your Comments:
(Date:10/12/2017)... ... October 12, 2017 , ... First Healthcare Compliance ... management, will showcase a range of technology and learning solutions at the 68th ... and Expo to be held October 14–18, 2017 at the Mandalay Bay Resort ...
(Date:10/12/2017)... PALM CITY, Fla. (PRWEB) , ... October 12, 2017 , ... ... of cold therapy products, announced today the introduction of an innovative new design of ... the multipurpose pad so you get maximum comfort while controlling your pain while using ...
(Date:10/12/2017)... , ... October 12, 2017 , ... ... Hair Restoration, has recently contributed a medical article to the newly revamped ... Dr. Mohebi’s article spotlights the hair transplant procedure known as Follicular Unit ...
(Date:10/12/2017)... Mich. (PRWEB) , ... October 12, 2017 , ... ... has been named one of Michigan’s 2017 Best and Brightest in Wellness® by ... Brightest in Wellness® awards program on Friday, Oct. 20 from 7:30 a.m. to ...
(Date:10/12/2017)... ... 2017 , ... Farm Forward joins Bon Appétit ... institutions in announcing the launch of the Leadership Circle , a program ... raised for food. , Founding members of the Leadership Circle also include Airbnb’s ...
Breaking Medicine News(10 mins):
(Date:9/25/2017)... , Sept. 25, 2017  EpiVax, Inc., a ... design, and immune-engineering today announced the launch of ... development of personalized therapeutic cancer vaccines. EpiVax has ... exclusive access to enabling technologies to the new ... will lead EpiVax Oncology as Chief Executive Officer. ...
(Date:9/19/2017)... 2017   ZirMed Inc ., a recognized leader in ... it has been ranked #1 by its users for the ... 2017 User Survey. ZirMed was recognized as the top-ranked end-to-end ... medical centers over 200 beds and holds one of the ... survey history. ...
(Date:9/12/2017)... -- Consumer reviews on the independent review site Consumer Affairs ... for hearing aids, ranking it higher than Miracle Ear ™, ... ... Hearing Aids ... store that provides high performance, state-of-the-art, German-engineered hearing aids directly to ...
Breaking Medicine Technology: