Lack of vitamin A, first causes night blindness or inability to see in dim light. The mother herself can detect this condition when her child cannot see in late evenings or find her in a darkened room. Night blindness is due to impairment in dark adaptation. Unless vitamin A intake is increased, the condition may get worse, especially when children also suffer from diarrhea and other infections.
Night blindness, officially known as nyctalopia, is inability to adapt to dark lighting conditions. When a person can't see well enough to discern contrasting images under low lighting conditions, blindness can result.
The retina is well supplied with an important chemical substance called rhodopsin, or “visual purple”. Light falling on the retina brings about certain chemical changes in the rhodopsin and other substances present in the rods and cones. These changes occur very rapidly, but large quantities of vitamin A are needed to bring this about. If there is any marked deficiency of vitamin A, night blindness may occur. This can usually be corrected by administering suitable amounts of vitamin A in the diet.
Vitamin A deficiency also contributes to development of night blindness because of the nutrient's importance in maintaining the health of the eye's retina. One study reported in Journal of Nutrition (October 2004) effectively used tests detecting night blindness in pregnant women to determine whether mothers-to-be lacked vitamin A considered crucial for healthy development of their babies.
Retinitis Pigmentosa is characterized by night blindness and black dotting of the fundus. The Optic Nerve becomes pale white, called Optic atrophy.
Types of Night Blindness
- Congenital Stationary Night Blindness: This type of night blindness, present at birth, can have varying causes often related to inherited disorders.
- Progressive Night Blindness: As implied by the name, progressive night blindness continues to worsen. Causes can include factors such as vitamin A deficiency, disease, and toxic effects of drugs including quinine used to treat malaria and other conditions.
- Night Blindness as Complication of Obesity Surgery: Individuals who undergo obesity surgery altering the way the body absorbs food can develop night blindness, primarily because nutrients such as vitamin A may be lacking if patients fail to use nutritional supplements following surgery.
What are the causes of night blindness?
Night blindness is due to a disorder of the cells in the retina that are responsible for vision in dim light. It has many causes,
- Lack of vitamin A, which can cause a disorder of the retina and make the eyes very dry
- Cataracts, which are cloudy areas in the lens of the eye
- Some forms of retinal degeneration, like retinitis pigmentosa
- Trouble adjusting from low levels of light to high levels of light
- Certain medications
- Birth defects
Some risk factors for night blindness include:
- Age: older people are more likely to have cataracts
- Diet: people who don’t eat enough sources of vitamin A, such as green leafy vegetables, eggs, and whole milk products (vitamin A deficiency is very rare in the US, but still occurs in certain less developed countries)
Disorders that affect the ability of the body to absorb vitamin A:
- Liver disorders
- Surgery on the pancreas or liver
- Intestinal conditions
What are the signs and symptoms of night blindness?
Symptoms are difficulty or inability to see in low light or darkness. While driving, this may also occur a few seconds after the bright headlights of an oncoming car have passed.
Associated symptoms include:
Treatment
Treatment for night blindness will depend upon its cause . Treatments generally include:
- Taking vitamin A supplements
- Removal of the cataracts.
- Eating a diet with adequate amounts of Vitamin A may help prevent night blindness.
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thanx
in the year 1995 i found that i am suffering from night blindness because i cannot able to see in the dark & as i am getting older day by day this desease is also increasing day by day and i think it get worse in 3 or 4 years but in the previous years i was doing well and did not get any discomfort with this desease but after 1996 i am having trouble with my eye sight, at night or in dimlight a cannot able to see at all. my father is also suffering with this desease, he is now 72 years old now a days he can not able to see in the day fortunately my great grand father was not suffering with this desease, the same case is happening also with my two brothers. their age 40 & 34 years old. Please suggest how do we get rid of this desease,what should i include in my diet Please send a brief information. I had visited several eye specialist doctors but could not get any treatment till now.
MYy Brother is also having nightblindness from his birth.His age is 25.I visited lots of specialist but no use. Can anyone see this and tell can it be cure by Medicine or operation. Please reply ..
Waiting for ur reply..
I have a daughter aged about 3 years 10 months. She is suffering night blindness disease by birth. She can not see property in dim light or darker areas as she is not able to seeing anything. I have taken to AIIMS, New Delhi but of no use, they are treating but no result have come out so far. As she is too young to explain what is she feeling. My I pray to God that she will be alright one day and all my friends too out there. Hope and pray to God that the doctors will keep on researching this disease and hope they will get through. IF any doctor or specialist in this field please please go through it and help me. I and my wife do not have hereditery night blindness problem in our families.
I nephew having problem of night blindness his age is 9 year now
Doctore says his eye pulse is too week, may be in future he can not see. his mom & dad is so scared
please suggest & help us
Thanks.
Thanx & Regards,
Sanjay
there are so many years that i would suffered from nightblindness and i will ask with your help regarding to my sickness
xxxx
I want to make an organisation of those people who are suffereing from night blindness.
So please contact me at my e-mail address
my e-mail address is Kedi2008@gmail.com
If you or any one related to you suffereing from nightblindess please please please contact me at my email address
I know GOD will help me
I am also suffereing from nightblindness since from birth.Now i am 25 yrs.old.
Is there any treatment for this.If any one knows please contact me at my email address. those people suffering from this problem or related with this problem please contact me at email address below
My brother is suffering from night blindness since birth. We have consulted the eye doctors and no progress. Is there any possible way for treatment? Please explain.
thank you
I have suffered from night blindness since birth and I am now 25 years old. I can't drive at night... I can barely see to walk at night! You both mentioned passing along this condition to children. It is most DEFINITELY something passed along. My mother and grandmother both suffer from the same problem I do!!
I have not read anywhere how to prevent spreading it, but my mother was told (in the early 80's in Europe) to take plenty of Vitamin A supplements while she was pregnant. Obviously I still inherited the condition, but I did not seem to suffer much until I was an early teen and I am not near as bad as my mother was at this age so there is hope that I didn't get the full bluntness of it.
Hopefully there will be more research out there soon. People laugh at me when I ask for a ride at night... no one even knows that night blindness is real!!
Good luck!
Blake.
Suffering from Nightblindness since I was born
and I can't really do anything about it My mom is really
annoying about that cuz she doesnt really let me go outside at nights.. What can I do? DX
My emil address is as
Kedi208@gmail.com
Tayyab
EMAIL ME AT : saima.sanjida@gmail.com
if u have night blindness since birth, please check whether it is retinitis pigmentosa, coz most probably it is. My mom and brothers had it too. If it is yes, then nothing we can do (at this stage) coz researchers still working on it.
Very scared!!!!!!!!!!!!!!!!!
i am 24 and here are the list of eye diseases i have
nightblindness
myopia ( -17 dioptre)
squint
(and i think i have astigmatism too which i came to know when i referred an article. but i dont know about how it affects one's vision and i am least bothered about it)
i am now working in a bank and here are few tips that i use to overcome my problems
nighhtblindness- always have a small tourch(flashlight) with you.having good and understanding friends is of great help.tell your companion that you are having such a problem if you are with a person who doesnt know about your problem(there are still good people in this world who are willing to help others who are less fortunate)sometimes some people may laugh at you and it will hurt like anything and what i do is laugh loudly with them and cry when i am alone its really a good technique and after few occassions you will be amazed to realise that these laughs no longer has any effect on you.
myopia- i wears contact lenses.simple!
squint- really a BIG problem than what it seems to be especially when we want to deal with a large number of persons daily.the problem is that people wont realise to whom we are talking. try to learn the names of persons whom you deal with and call their names while you are talking to them.be confident and never let yourselves down by seing people getting confused and looking back to check whether we are talking to someone standing behind them, just enjoy the situation.
after all what matters is how we see things rather than what we see.
just chill its just a disease and its not your fault at all
and at last, you know what, my friends sometimes never belived that i have visual problems bcoz i was the one who notices first,when a beauty passes by.
asking people with visual problems to 'enter the text you see in the image below' is really funny. hey man we cant see properly and thats why we are here
I have difficulty to see in night but in very low light. the vision bblurring also present in the day and night...
I need specific intervention.....
please help