The Optomap Retinal Exam Jun 16, 2009
The image provides the optometrists at Jamie Rose Eyewear enhanced clinical information which facilitates the early detection, management and treatment of disorders and diseases evidenced in the retina such as detachment and tears, glaucoma, diabetic retinopathy and age-related macular degeneration. Additionally, the Optomap Retinal Exam may also indicate evidence of non-eye or systemic diseases such as hypertension, diabetes and certain cancers. (Queens Chronicle, NY)
More of this story Jun 16, 2009
The OCT machine is "the gold standard of retinal scanners," said Dr. Stanchfield ... It allows for early detection of diseases and can be used to monitor the damage done by glaucoma and other retinal diseases ... When the OCT takes a picture, it collects an image of the retina, which is the back of the eye. (Cut Bank Pioneer Press - Golden Triangle, MT)
Omega-3-Fatty Acids May Slow Macular Disease Jun 16, 2009
Age-related macular degeneration is an eye disorder that affects the macula, the part of the retina responsible for central vision, and is primarily seen in patients older than 60 years. The findings are based on an analysis of data from 2924 subjects who were enrolled in the Age-Related Eye Disease Study (AREDS) and were randomly assigned to receive one of four dietary supplement groups: placebo, antioxidants, zinc, or antioxidants plus zinc. (MEDLINEplus)
Stem Cells Cultured On Contact Lens Restore Sight In Patients With Blinding Corneal Disease Jun 6, 2009
The researchers are hopeful the technique can be adapted for use in other parts of the eye, such as the retina, and even in other organs. If we can do this procedure in the eye, I don t see why it wouldn t work in other major organs such as the skin, which behaves in a very similar way to the cornea, Dr Di Girolamo said. (Science Daily)
Wang struggles but Yankees rally to win Jun 5, 2009
Rangers radio play-by-play man Eric Nadel had surgery in New York to repair two tears in the retina of his right eye. He called his 3,176th straight game Wednesday night. (MSNBC -- Sports)
Discoveries Shed New Light On How The Brain Processes What The Eye Sees Jun 5, 2009
The process of seeing requires the eyes to move so light can hit the photoreceptors at the center of each retina, which then pass that information to the brain. If we were cognizant of the stimulus that passes before the eyes during the two to three times they move every second, however, vision would consist of a series of sensations of rapid motion rather than a stable perception of the world. (Science Daily)
Squid 'Sight' Sheds Light On Human Eye Diseases Jun 3, 2009
Molecular analysis showed that genes that produce key visual proteins are expressed in light-organ tissues, including genes similar to those that occur in the retina. They also showed that, as in the retina, these visual proteins respond to light, producing a physiological response. (Science Daily)
Light-treatment Device To Improve Sleep Quality In The Elderly Jun 2, 2009
Light stimulus travels through the retina, the light-sensitive nerve tissue lining the back wall of the eye, to reach the master clock in the brain. However, a combination of age-related changes in the eye and a more sedentary lifestyle may reduce the amount of light stimulus reaching an older person s retina, therefore reducing the amount of light for the circadian system ... As we age, the lens in the eye thickens and the pupil shrinks, reducing the amount of light passing through to the... (Science Daily)
QLT announces positive results from the evaluation of Visudyne(R) combination therapy Jun 2, 2009
8 ------------------------------------------------------------------------- P values are from comparison with Lucentis monotherapy CI: confidence interval "The ability of Visudyne-Lucentis triple therapy to decrease the number of retreatment visits for patients while showing vision improvement and an acceptable safety profile is very encouraging," said Allen C. Ho, M.D., Retina Diagnostic ment Assoc ... "The RADICAL study has validated our therapeutic approach to wet AMD," said Henry Hudson,... (Canada Newswire)
HealthWatch: Macular Degeneration Jun 2, 2009
In normal vision, images are focused on the retina ... The telephoto effect allows images in the central visual field to not be focused directly on the damaged macula, but rather spread over other healthy areas of the central and peripheral retina, compensating for the blind spot. (CBS 2, NY)
Intraocular Pressure and Glaucoma May 31, 2009
One is the gel-like vitreous humor in the posterior chamber between the back of the lens and the retina at the rear of the eye ... Ophthalmoscopic Exam: The physician dilates the patient's pupil with special eyedrops and inspects the retina with a magnifying ophthalmoscope. (Suite101.com)
Deaf to sign via video handsets May 30, 2009
This lets the peripheral vision pick up the gross movements of arms and hands while the fovea, the part of the retina capable of picking out detail, concentrates on the smaller facial actions. The system developed by the team can work across networks that only had 10-20 kilobits per second of bandwidth available, said Prof Ladner. (Yahoo News -- Disabilities and the Disabled)
Leroy Hoeck; linked oxygen, newborns' blindness May 29, 2009
Patz and other researchers later showed that this response was especially dramatic in preemies and could lead to the destruction of the retina. Dr. Hoeck mentioned the discovery to Patz, an ophthalmology resident at Gallinger also interested in the problem. (Boston Globe)
Researchers Hail Stem Cells Safe for Human Use May 29, 2009
In fact, they seem to flourish more robustly than the traditional iPS cells, at least in lab tests that involve regrowing certain cells found in the retina. This could lead to a potential treatment to replace damaged eye cells in conditions such as retinitis pigmentosa or macular degeneration. (Time.com)
Chetek native isn't slowing down after losing 97 percent of sight May 28, 2009
Wright, a 2001 graduate of Chetek High School, was diagnosed at age 5 with retinal degenerative disease, known as retinitis pigmentosa. With RP, abnormalities in the rods and cones in one's retina generally lead to a progressive loss of vision ... Wright adds that anyone who wants to join the fight against blindness and degenerative retinal diseases can contact the Foundation for Fighting Blindness and visit www. (Chetek Alert, WI)
Police arrest one suspect in mugging, continue search for two more May 28, 2009
Police said the suspects knocked out several of the man s teeth and damaged the retina in one eye. More News. (Winona Daily News, MN)
Three men charged in mugging and beating of man who lost teeth May 27, 2009
Police say the suspects robbed a man, knocked out several of his teeth and damaged his retina. Police found the 22-year-old man about 2:30 a.m. near Sanborn and Zumbro streets. (Winona Daily News, MN)
How Night Vision Developed In Primates May 24, 2009
In the eye's retina, for example, cones -- which help distinguish color during the day -- develop before the more light-sensitive rods -- which are needed for night vision ... In both monkey species, the specialized eye cells develop in the growing embryo from a single retinal progenitor cell ... Finlay and her colleagues compared the developing eyes in fetuses of the two species to better understand how the nocturnal owl monkeys developed retinas with many more rod cells than cones, while... (Science Daily)
Identifying 4-H animals has gone high tech May 22, 2009
Deanna Rinker, left, and Rachel Jones, 4-H fairboard volunteers, conducted retinal scans on a goat at the fairgrounds in Hartford City Friday, May 15 in preparation for 4-H Fair ... The Indiana State Fair is entering its third year for requiring cattle (beef and dairy), sheep and goats to be retinal scanned as part of the ... "It is especially difficult with sheepand the most difficult with goats. The retina is much smaller with these animals than with cattle.". (Hartford City News-Times, IN)
Healing process for Amaré's eyecontinues to be slow and steady May 22, 2009
After suffering a retina detachment that his surgeon believes has never happened to an athlete of his caliber, Stoudemire is enduring a healing process that moves in a stark contrast to how he has sped up and down the court for the Suns. From an October poke that tore his right iris to a February strike near the same eye, Stoudemire had suffered cumulative trauma that led to the Feb. 20 surgical discovery of relatively large tears on his right eye's retina ... A thick fluid under the retina must... (AZCentral -- Sports)
Trials for 'bionic' eye implants May 22, 2009
Patients who tested less-advanced versions of the retinal implant were able to see light, shapes and movement ... 1: Camera on glasses views image 2: Signals are sent to hand-held device 3: Processed information is sent back to glasses and wirelessly transmitted to receiver under surface of eye 4: Receiver sends information to electrodes in retinal implant 5: Electrodes stimulate retina to send information to brain ... Retinal implants are able to partially restore the vision of people with... (Yahoo News -- Disabilities and the Disabled)
Tech Helps Curb Infant Blindness May 22, 2009
The tool provides high-resolution images of the retina that are transmitted electronically to Packard's central reading station where a specialist reviews the picture ... The ability to screen infants from a distance is an important development, said Dr. Antonio Capone, director of vitreoretinal fellowship training at William Beaumont Hospital in Royal Oak, Michigan ... To treat ROP doctors use laser or freezing techniques to destroy the periphery of the retina and halt the growth of abnormal... (Yahoo News -- Children's Health)
'Viagra not harmful to men's vision' May 18, 2009
And, thus, doctors feared that these drugs could also act on similar compounds in the retina in the eye that receives and transmits images, reports the China Daily. The study was conducted on a total of 244 healthy men, aged 30 to 65, some with mild erectile dysfunction. (India Times, India)
Saffron helps fight blindness May 18, 2009
AMD is a disease of the retina that can cause loss of central vision and make it difficult to recognise faces, read, drive, and perform other everyday activities. A clinical trial with patients suffering AMD in Rome has found early indications that treatment with a dietary supplement of saffron may cause damaged eye cells to recover. (India Times, India)
Eating Fish, Nuts And Olive Oil May Be Associated With Reduced Risk Of Age-related Blindness May 16, 2009
Digital photographs of the retina were used to assess the development of AMD five and 10 years later ... These fatty acids may protect the eyes by preventing the buildup of plaque in the arteries or reducing inflammation, blood vessel formation and oxygen-related cell damage in the retina ... In contrast, omega-three fatty acids are believed to protect against damage to the retina, thereby reducing risk for AMD. Although the primary fats found in olive oil (oleic acid and monounsaturated fatty... (Science Daily)
Age-related Eye Disease May Be Associated With Cognitive Impairment May 15, 2009
Participants underwent cognitive testing, retinal photography for the detection of AMD and an extensive assessment of artery disease and its risk factors (including blood pressure, smoking status and body mass index) ... Macular degeneration, a condition that occurs in the retina and most affects an individuals' ability to drive and read, is being better diagnosed by. (Science Daily)
Being blind, 'you have to be adventurous' May 14, 2009
Another avenue of research is the retinal implant ... The macula, a part of the retina that allows central vision, deteriorates in this condition ... Another avenue of research is the retinal implant. (CNN -- Health)
Rare eye surgery lets dad see son for first time May 12, 2009
A team of surgeons at St. James University Hospital in Leeds fixed a detached retina and a dislocated lens, then grafted on a cornea from a donor ... He explained that a plastic cornea was attached during the operation to allow the surgeons to fix the retina at the back of the eye. (MSNBC -- Health)
Fish, olive oil, nuts good for eyes too May 12, 2009
Age-related macular degeneration occurs when blood vessels or cells in the center of the retina break down. Studies from two different teams published Monday in the Archives of Ophthalmology provide more evidence that these foods -- which contain healthy fats -- can reduce the risk of developing a retina-destroying condition known as age-related macular degeneration (AMD) ... It occurs when blood vessels or cells in the macula, the central portion of the retina responsible for central vision and... (CNN -- Health)
New Target Identified For Potential Treatment Of Retinopathy In Premature Babies May 12, 2009
"Paradoxically, it isn't high oxygen levels that damage the retina," explained first author Monica Guma, MD, PhD, of the departments of pharmacology and pathology at the UC San Diego School of Medicine. "Rather, the premature retina is first exposed to a high-oxygen environment and becomes accustomed to it. When the infant is more mature and is returned to a 'normal' oxygen environment, the retina reacts to this hypoxia or decrease in oxygen availability as a stress." ... Using a mouse model of... (Science Daily)
Protein-protein interaction explains vision loss in genetic diseases May 11, 2009
However, the researchers showed that, when people who have similar diseases that are caused by different gene mutations affecting the cilia also have a particular variant of this gene, they also suffer more severe degeneration of the retina the light-sensing part of the eye and lose vision. "When you look at a disorder such as Bardet-Biedl Syndrome with multiple features extra fingers and toes, retinitis pigmentosa (a vision disorder), asthma, obesity and kidney, you wonder how a single... (EurekAlert!)
First Study Of Combined Dietary Factors Finds Reduced AMD Risks May 10, 2009
Study participants whose diets included higher levels of protective nutrients and of low-GI foods were at lowest risk for early and advanced AMD. This eye disease affects the retina, the sensitive tissue at the back of the eye that transmits images to the brain; advanced AMD can destroy the detailed, central vision people need to read, drive, and enjoy daily life ... Macular degeneration, a condition that occurs in the retina and most affects an individuals' ability to drive and read, is being... (Science Daily)
'Gecko vision': Key to the multifocal contact lens of the future? May 8, 2009
"We were interested in the geckos because they and other lizards differ from most other vertebrates in having only cones in their retina," said project leader Lina Roth, PhD, from the Department of Cell and Organism Biology at Lund University in Sweden ... The nocturnal geckos' multifocal optical system gives them an advantage because light of different ranges of wavelengths can focus simultaneously on the retina. (EurekAlert!)
USC Aiken cheers challenged athlete May 8, 2009
USC Aiken cheers athlete challenged by eye cancer 050809 - The Augusta Chronicle. AIKEN --- Two months earlier, Basil and Robin Legg had plenty to be excited about with the impending graduation of their daughter, Meredith. (The Augusta Chronicle)
Excessive Increase In Heart Rate During Mental Stress Before Exercise Doubles Risk Of Dying Suddenly From Heart Attack In Later Life May 6, 2009
AMD affects the center of the retina (macula) at the back of. (Sep. (Science Daily)
Carbon Nanotube Device That Can Detect Colors Of The Rainbow Constructed May 5, 2009
When light strikes the retina, it initiates a cascade of chemical and electrical impulses that ultimately trigger nerve impulses ... In our eyes the neuron is in front of the retinal molecule, so the light has to transmit through the neuron to hit the molecule, says Sandia researcher Xinjian Zhou. (Science Daily)
Human Brain Can Recognize Objects Much Faster May 4, 2009
Visual information flows from the retina of the eye up through a hierarchy of visual areas in the brain, finally reaching the temporal lobe. The temporal lobe, which is ultimately responsible for our visual recognition capacity and our visual perceptions, also signals back to earlier processing areas. (Science Daily)
Cat Eye Infections May 2, 2009
Causes, Symptoms, and Treatment of Common Feline Eye Problems. Infections are common eye problems in cats and are caused by a variety of pathogens. (Suite101.com)
Video: Turning Hope Into Reality - Vision Research at the VA Apr 30, 2009
Among VA's research projects in the exciting domain of vision restoration for Veterans are the development of an artificial retina to restore vision to those affected by macular degeneration and retinitis pigmentosa; the design and improvement of assistive devices for those with visual impairments; and the development of more accurate and efficient methods of vision testing ... For those with this condition or another major cause of vision loss, retinitis pigmentosa, VA researchers in Atlanta... (PR Newswire)
Bayer and Regeneron Extend Development Program for VEGF Trap-Eye to Include Central Retinal Vein Occlusion Apr 30, 2009
BERLIN and TARRYTOWN, N.Y., April 30 /PRNewswire-FirstCall/ -- Bayer HealthCare AG and Regeneron Pharmaceuticals, Inc. (Nasdaq: ) today announced that the companies are extending their global development program for VEGF Trap-Eye, an investigational agent for the treatment of certain eye diseases, to include Central Retinal Vein Occlusion (CRVO) ... CRVO is caused by obstruction of the central retinal vein that that leads to a back up of blood and fluid in the retina, resulting in retinal injury... (PR Newswire)
Researchers Identify Gene Associated With Muscular Dystrophy-related Vision Problems Apr 29, 2009
Previous work linked aberrant FRG1 expression to the skeletal muscle defects of FSHD, and this study shows that FRG1 expression similarly contributes to abnormal blood vessel growth in the retina. Thus, the FSHD mutation, by affecting expression of the FRG1 gene may contribute to both the skeletal muscle and visual deficits associated with FSHD pathology. (Science Daily)
COMMENT: What Happens Up There Apr 18, 2009
The SCN-generated rhythm is aligned to the daily solar cycle of 24 hours by the photic signals of sunrise and sunset via a light-sensing pigment called melanopsin, found in special cells located in the retina of the eye. We know now that as well as the SCN, mammalian tissue cells like the liver, kidneys and heart (though notably not the testes) have their own circadian clocks. (India Times, India)
Drug May Not Help Diabetes-Related Eye Damage Apr 18, 2009
About 50 percent of people who have type 1 diabetes and 30 percent of those with type 2 diabetes develop retinopathy, which is damage to the retina caused by diabetes-related complications ... When this happens, fluid and protein deposits accumulate near or at the macula, the central area of the retina, causing it to thicken and swell, according to background information in a news release from The Lancet. (MEDLINEplus)
Impotence Drugs Don't Harm Vision Apr 16, 2009
But there are concerns that PDE5 inhibitors may also act on similar compounds in the retina, the part of the eye that receives and transmits images to the brain, according to background information in the study ... "Furthermore, PDE5 inhibitors can exert direct effects on the retina, and such effects probably account for many of the visual side effects such as blue-tinged vision and light sensitivity that have been reported," they concluded. (MEDLINEplus)
Nearly 18 Million Will Have Macular Degeneration by 2050 Apr 16, 2009
Age-related macular degeneration is a serious eye disease that causes the breakdown of the macula, which is located in the retina ... "If you're 60 or older, have regular eye checkups with an ophthalmologist or a retinal specialist to find out if you have any early changes that suggest AMD.". (MEDLINEplus)
Kolkata: Man gets vision at 22 Apr 15, 2009
Sanjoy's retina had become lazy which in medical term was known as stimulus deprivation amloypia, he said. To make matters more complicated, his eyeball movement was very erratic and fast, making it difficult to conduct several tests and fix the lens, the doctor said adding there was also calcium deposition in the right eye, but it was removed. (India Times, India)
Causes of Sudden Vision Loss in Cat... Apr 15, 2009
When high blood pressure reaches a certain level, retinal detachment takes place ... If the cat's dilated pupils respond to the light by constricting (shrinking in size), this usually indicates that the eyes are functioning, however there may still be a central neurological problem, whereas, if the cat's dilated pupils do not respond by constricting, this usually indicates that the triggering cause lies within the retina or optic nerve ... Prognosis of Retinal Detachment due to Hypertension. (Suite101.com)
USC Aiken star battles eye cancer Apr 15, 2009
She was referred Friday to a specialist in Augusta, who initially thought she might have damaged tendons in her retina. A tumor was discovered, and she was sent Sunday to a specialist in Philadelphia, where she was diagnosed with melanoma of the eye -- an extremely rare form of cancer. (The Augusta Chronicle)
New Test Could Find Eye Disease In Preemies Apr 15, 2009
Retinopathy Of Prematurity Rips Apart Retina ... WASHINGTON -- Dr. Thomas Lee painstakingly scrapes away spiderweb-like tentacles deep inside a premature baby's eye, scar tissue that is pulling apart the infant's retina ... RoP can destroy the retina, the eye's innermost layer. (KIRO TV, WA)
Do Viagra, Cialis Damage Vision? Apr 15, 2009
The compound is also active in the retina, and some users of the drugs reported mildly blurry vision, blue-tinged vision or changes in light. To test the problem, researchers from drug maker Eli Lilly found 244 healthy men, some with mild erectile dysfunction. (Click2Houston, TX)
Healthy Men Who Took Viagra, Cialis See Fine Apr 15, 2009
But PDE5 inhibitors may also act on blood vessels in the retina, which could explain some of the reports of vision problems. To test this, a team led by Dr. William Cordell of Lilly Research Laboratories in Indianapolis and colleagues conducted a randomized study to look for changes in the retina among men taking Viagra or Cialis ... They said their study was limited because the doses used were lower than some other studies that did find retinal changes. (MEDLINEplus)
Testing tool to better detect preemie eye disease Apr 15, 2009
WASHINGTON ---- Dr. Thomas Lee painstakingly scrapes away spiderweblike tentacles deep inside a premature baby's eye, scar tissue that is pulling apart the infant's retina ... RoP can destroy the retina, the eye's innermost layer ... If the laser therapy fails, scar tissue can cause the retina to detach ---- but removing that tissue is risky, because a slightly wrong move can cost vision. (North County Times)
Erectile dysfunction treatments do not appear to damage vision over 6 months Apr 14, 2009
However, PDE5 inhibitors may also act on similar compounds in the retina, the part of the eye that receives and transmits images ... William H. Cordell, M.D., of Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, and colleagues conducted a randomized placebo-controlled study to assess changes in the retina among men taking tadalafil or sildenafil ... The men underwent comprehensive ophthalmologic examinations including electroretinography (a test to measure the electrical response... (EurekAlert!)
Study reports success in treating a rare retinal disorder Apr 14, 2009
"The results challenge the commonly held belief that autoimmune retinopathy is untreatable," says John R. Heckenlively, M.D., author of the report and an international expert on retinal dystrophies. In this disease, antibodies attack the retina, resulting in progressive vision loss and eventual blindness ... "It is not easy to identify patients with AIR because the clinical symptoms are very similar to other diseases involving retinal degeneration," says Heckenlively. (EurekAlert!)
New therapies expected to help reduce future visual burden of age-related eye disease Apr 14, 2009
Age-related macular degeneration (AMD) occurs when the macula, the area of the eye's retina responsible for sharp vision, begins to deteriorate. In 2000, as many as 1. (EurekAlert!)
Tool offers hope in curing preemie eye disease Apr 14, 2009
WASHINGTON - Dr. Thomas Lee painstakingly scrapes away spiderweb-like tentacles deep inside a premature babys eye, scar tissue that is pulling apart the infants retina ... RoP can destroy the retina, the eyes innermost layer ... If the laser therapy fails, scar tissue can cause the retina to detach but removing that tissue is risky, because a slightly wrong move also can cost vision. (MSNBC -- Health)
Diabetes Drug Class Linked To Vision-Threatening Complication Apr 13, 2009
Donald S. Fong and Richard Contreras of Southern California Permanente Medical Group analyzed the link between glitazones and the development of DME. Diabetic macular edema is a common diabetes complication, with swelling and fluid build-up in the retina leading to progressive visual loss. The researchers identified 996 patients who were diagnosed with DME during 2006. (Science Daily)
Eye 'compensates for blind spot' Apr 11, 2009
The macula is a small area of the retina at the back of the eye made up of specialist cells which process central vision as well as the fine detail of what we see. Our scheme has transformed lives - helping people to relearn basic skills they thought to have lost for good. (BBC News -- Health)
The bionic body 2.0 Apr 10, 2009
Spence will not be augmenting his senses in the traditional bionic sense -- his vision won't improve at all because his retina was damaged to the point where he had his eye replaced with a prosthetic ... So far, the company says it has implanted the device in 21 people around the world who have retinal degeneration ... Captured images are transmitted to electrodes implanted in the retina, which then send images to the brain. (CNN -- International)
Certain Diabetes Drugs May Pose Eye Risk Apr 9, 2009
Use of Avandia, Actos tied to a retinal disorder, study finds ... TUESDAY, April 7 (HealthDay News) -- A class of diabetes drugs called glitazones are associated with an increased risk of a vision-threatening complication called diabetic macular edema (DME), which features swelling and fluid accumulation in the retina. (MEDLINEplus)
Growth factor TGF-B helps maintain health of retinal blood vessels Apr 8, 2009
Scientists at Schepens Eye Research Institute have found that the growth factor known as TGF- is essential to the health of blood vessels in the retina and that blocking it can cause retinal dysfunction ... "These results are significant because they add to our understanding of the molecules that help to maintain blood vessels in a healthy state," says Patricia D'Amore, PhD, senior scientist at Schepens and principal investigator of the study, who adds that this information may be useful in... (EurekAlert!)
The Neuroscience of Yoricks's Ghost and Other Afterimages Apr 8, 2009
Vision scientists believe that the adaptation effect producing poor Yorick s afterimage largely takes place in the neurons of the retina. How can we know. (Scientific American)
How The Retina Works: Like A Multi-layered Jigsaw Puzzle Of Receptive Fields Apr 8, 2009
25 million neurons in the retina -- each of which views the world only through a small jagged window called a receptive field -- collectively form the seamless picture we rely on to navigate our environment ... "The striking coordination we found when we examined a whole population indicated that neuronal circuits in the retina may sample the visual scene with high precision, perhaps in a manner that approaches the optimum for high-resolution vision," says senior author E.J. Chichilnisky, Ph ...... (Science Daily)
Brain Mapping Time Reduced From Years To A Few Months With New Technology Apr 8, 2009
As part of this project, the authors will soon reveal the very first molecular level map of the entire retina and neuronal networks in both a normal mammalian retina and genetic models of retinal degeneration ... While this molecular model of the retina is groundbreaking, the technology will extend far beyond ophthalmology. (Science Daily)
Dead cells help fish see Apr 7, 2009
The lens can then only focus a single wavelength on the retina. The eye thereby loses its ability to create sharp colour images, but instead utilises the wavelengths that are most important for night vision. (India Times, India -- Health/Science)
