Navigation Links
NASA-sponsored study describes how space flight impacts astronauts' eyes and vision
Date:11/3/2011

in the ears. Researchers believe other factors may be involved, such as abnormal flow of spinal fluid around the optic nerve, changes in blood flow in the choroid, or changes related to chronic low pressure within the eye, which is known as intraocular pressure. They hypothesize that these changes may result from the fluid shifts toward the head that occur when astronauts spend extended time in microgravity.

The visual system changes discovered by the researchers may represent a set of adaptations to microgravity. The degree and type of response appear to vary among astronauts. Researchers hope to discover whether some astronauts are less affected by microgravity and therefore better-suited for extended space flight, such as a three-year round trip to Mars.

In their report, Drs. Mader and Lee also noted a recent NASA survey of 300 astronauts that found that correctible problems with both near and distance vision were reported by about 23 percent of astronauts on brief missions and by 48 percent of those on extended missions. The survey confirmed that for some astronauts, these vision changes continue for months or years after return to Earth. The possibility of near vision problems has been recognized for decades, and special "space anticipation glasses" to improve visual sharpness have been provided on all spacecraft dating back to John Glenn, who had a pair in his space capsule.

"In astronauts over age 40, like non-astronauts of the same age, the eye's lens may have lost some of its ability to change focus," said Dr. Mader. "In the space program's early days most astronauts were younger, military test-pilots who had excellent vision. Today's astronauts tend to be in their 40s or older. This may be one reason we've seen an uptick in vision problems. Also, we suspect many of the younger astronauts were more likely to 'tough out' any problems they experienced, rather than reporting them."

As part of ongoing research all astronaut
'/>"/>

Contact: Mary Wade
mwade@aao.org
415-447-0221
American Academy of Ophthalmology
Source:Eurekalert

Page: 1 2 3

Related medicine news :

1. Despite Treatment, Employees with Depression Generate Higher Absentee Costs, According to Thomson Reuters Study
2. American Council on Exercise (ACE) Study Reveals Kettlebells Provide Powerful Workout in Short Amount of Time
3. TV drama can be more persuasive than news program, study finds
4. Study carried out into biological risks of eating reptiles
5. Neuroimaging study may pave way for effective Alzheimers treatments
6. Study finds racial gaps continue in heart disease awareness
7. Luth Researchs IndicatorEDG(TM) Study Finds Americans Hopes of Achieving Their Dreams Are Fading
8. First blinded study of venous insufficiency prevalence in MS shows promising results
9. Soothing infants with food focus of childhood obesity study
10. People with anxiety disorder less able to regulate response to negative emotions, study shows
11. American Heart Association Rapid Access Journal Report: Study Finds Racial Gaps Continue in Heart Disease Awareness, Low Knowledge of Heart Attack Warning Signs Among Women
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/25/2014)... The microscopy market is estimated ... reach $5,756.0 million by 2019. Optical microscopy is ... electron microscopes product segment is expected to show ... Rising focus on nanotechnology, technological advancements, and increasing ... market. , Get Full Copy of Report @ ...
(Date:12/25/2014)... The click strand woven bamboo flooring ... the business announces a click strand woven bamboo ... 2015. , Click strand woven bamboo flooring replicates ... well-known brand in the bamboo industry. It promises ... bamboo flooring supplier. , “We are happy to ...
(Date:12/25/2014)... (PRWEB) December 26, 2014 The report ... 2023” focuses on the current treatment landscape, unmet needs, ... market. TS-1 is an anti-cancer drug which is typically ... and is also used for treating gastric cancer and ... otastat potassium. The drug was first approved in 1999 ...
(Date:12/25/2014)... three months the trends for evening dresses shift ... one of the hottest styles in the next few months.” ... releases 26 A-line sweetheart evening dresses, and announces the availability ... are trying our best to help a lady to show ... affordable prices, we provide discounted delivery costs to our customers ...
(Date:12/25/2014)... 2014 Recently, Dylan Queen, a famous ... released its collection of discounted prom dresses, most of ... senior spokesman of the company, the promotion is valid ... is to expand the UK market. , The prom ... colors, lengths, and styles: A-line strapless, empire strapless chiffon, ...
Breaking Medicine News(10 mins):Health News:Microscopy Market Hit to $5,756.0 Million by 2019 - New Research Report by MarketsandMarkets 2Health News:Microscopy Market Hit to $5,756.0 Million by 2019 - New Research Report by MarketsandMarkets 3Health News:Microscopy Market Hit to $5,756.0 Million by 2019 - New Research Report by MarketsandMarkets 4Health News:BambooFlooringChina.com: click strand woven bamboo flooring promotion valid until Jan. 30, 2015. 2Health News:TS-1 Colorectal Cancer Market Analysis and Forecast to 2023 Report at RnRMarketReserach.com 2Health News:TS-1 Colorectal Cancer Market Analysis and Forecast to 2023 Report at RnRMarketReserach.com 3Health News:Dylan Queen: Cheap Prom Dresses for the UK Market 2
... International Cancer Research team has come out with the startling ... development of tumors in mice. This discovery could be vital ... molecules work by blocking the hormones that are essential for ... they strangle the tumor by blocking blood and nutrient supply ...
... turning their backs on tanning amid growing concerns over skin ... survey shows that teenagers are resisting the urge to tan ... 5,073 Australian adults and 699 Australian teenagers aged 12 to ... that 68 % of those aged 12-17 said they had ...
... part of the school curriculum from Class IX in all ... the age of 25. The new curriculum would be made ... the Human Resource Department of Government of India and National ... ministry has also made it compulsory to train teachers on ...
... have reacted with skepticism to a British man's claims that he ... some relief. // , ,In what is assumed as a ... now available in India. , ,This medicine is provided in ... that it would help the infected people to lead a much ...
... are unconcerned with the effect of their habit on the ... the damage // that smoking caused to the tongue or ... strangely reluctant to change their habits. This is of particular ... a massive awareness campaign as a part of the Mouth ...
... a doctor's permission is good at any time of life, ... study. // ,Thomas Foster and other scientists from the McKnight ... of rats that had lived to old age. Some were ... , ,Scientists examined chemical compounds in 41 tissue samples ...
Cached Medicine News:Health News:Aussie teens applauded for declining sun tan 2Health News:Regular light exercise slows down aging of the brain 2
(Date:12/22/2014)... 22, 2014 Research and Markets ... the "Investment Analysis of the US Medical ... http://photos.prnewswire.com/prnh/20130307/600769 ... medical device sector identifies the key trends and ... investments, and mergers and acquisitions. The ...
(Date:12/22/2014)... Pa. and STOCKHOLM , ... (publ) (Sobi) and partner Auxilium Pharmaceuticals, Inc. today announced ... (CHMP) of the European Medicines Agency (EMA) has adopted ... clostridium histolyticum) for the treatment of adult men with ... of at least 30 degrees at the start of ...
(Date:12/22/2014)... 22, 2014  Eiger BioPharmaceuticals Incorporated announced the ... lonafarnib in patients with chronic hepatitis delta virus ... National Institutes of Health (NIH) Clinical Center in ... randomized, placebo-controlled, dose ascending study evaluated two doses ... mg twice daily for 28 days.  "This proof-of-concept ...
Breaking Medicine Technology:Investment Analysis of the US Medical Device Sector 2Sobi's Xiapex receives positive opinion by CHMP for the treatment of Peyronie's disease 2Sobi's Xiapex receives positive opinion by CHMP for the treatment of Peyronie's disease 3Sobi's Xiapex receives positive opinion by CHMP for the treatment of Peyronie's disease 4Sobi's Xiapex receives positive opinion by CHMP for the treatment of Peyronie's disease 5Sobi's Xiapex receives positive opinion by CHMP for the treatment of Peyronie's disease 6Eiger Bio Announces Positive Data in Patients Infected with Hepatitis Delta Virus (HDV) Treated with Lonafarnib - Results Presented at American Association for the Study of Liver Diseases (AASLD) Meeting 2Eiger Bio Announces Positive Data in Patients Infected with Hepatitis Delta Virus (HDV) Treated with Lonafarnib - Results Presented at American Association for the Study of Liver Diseases (AASLD) Meeting 3
... (Pink Sheets: MDBX ) ( www.thedispensingsolution.com ), ... to MDBX.  The company previously announced that their name ... The company is a leader in the design, manufacture ... The free-standing unit features 60 or more slots that ...
... 2011 This year, the melanoma community saw the first ... This major step forward will give more than 400 party-goers ... Gala.  They will gather at the Trump National Golf Club ... these cutting-edge advances and raise money for future research through ...
Cached Medicine Technology:MedBox Announces Ticker Symbol Change 2Washington, D.C. Melanoma Patient Community Celebrates Treatment Advances 2Washington, D.C. Melanoma Patient Community Celebrates Treatment Advances 3
Cushing-Hopkins periosteal elevator, Gutsch handle, blade width 7/16" (11 mm), length 7 5/8" (194 mm)....
Barr periosteal elevators....
Seldin periosteal elevators....
Williger periosteal elevators....
Medicine Products: