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Some Important Deficiencies
 
 
 
 
 
Night Blindness
 

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
  1. Congenital Stationary Night Blindness: This type of night blindness, present at birth, can have varying causes often related to inherited disorders.
  2. 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.
  3. 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:

  • Dry eyes
  • Blurred vision
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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Comments

Hi, i suffer from nightblindness and a lazy eye, so no depth preseption. It sucks. i was told there is nothing i could do about it. As a result i had to release from the army. Just last week i heard about vision therapy to treat the lazy eye, it seems promising so we'll see how it goes. as for the nightblindness i havn't yet came accross anything for it. I am shocked on how little information there is about the condition. Medicine has come along way, but i guess there is quit a way to go still... i wish you all the best..
#27 - Mr. X - 03/27/2008 - 20:59
Hiiiiiii all of you
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
#26 - kedarprabhakarraobhale@yahoo.com - 03/08/2008 - 01:22
my grandfather is not able to see clearly in night . can anyone tell me its cure.
#25 - rahul kumar - 02/18/2008 - 20:43
I can't drive at night and the sun hurts my eyes if I am outside on a clear day. I am see best in overcast days. I am not sure if I have night blindness but I have a similar problem with not being able to see after cars pass if they are driving on a non divided road. I stopped driving at night. Can you test for night blindness?
#24 - Tracellia - 02/15/2008 - 19:26
Hi Everybody.'I am kedar bhale suffering from nightblindness by birth.Now i am 25 years old.I want to meet those persons who are suffereing from this disease.
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
#23 - kedi2008@gmail.com - 02/11/2008 - 04:37
my sister is suffering from this disease since birth... now she is 15. if anybody could tell me its cure please tell... need help...
#22 - Aan - 02/03/2008 - 01:39
I have night blindness from drinking too much alcohol at a young age. It really blows! My only suggestion is to shave your sack
#21 - Matt Holden - 01/25/2008 - 07:32
hi i have nightblindness, i find it very hard to live with,i have suffered with it from birth. i am now 37. i am pregnant would my son or daughter suffer with this too ?.
xxxx
#20 - Babara - 01/17/2008 - 03:48
i feel night blindness!!!

there are so many years that i would suffered from nightblindness and i will ask with your help regarding to my sickness
#19 - joel - 01/10/2008 - 19:28
I am suffering from night blindness since my birth as my mother also suffering from the same.. Pls. guide me what treatment should i take to overcome this diseases and also guide what measure should i take so that this diseases will not transfer to future generation.

Thanx & Regards,
Sanjay
#18 - Sachin Yerunkar - 01/09/2008 - 22:57
about 3 years ago (when i was 9) i was having problems seeing and all i could see was a black dot in centre of my vision. Now i cant see properly in the dark and its awful
#17 - Hayley - 01/03/2008 - 07:15
I am suffering night blindness since birth. It is pain in my eye balls. I pluck one out. It hurt so bad it feel good. I now have 1 eyed face. But it is better this way. I give you all hope for survival. Learn to live!
#16 - Jo Jock - 12/21/2007 - 12:41
Hi I am vishal
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.

#15 - vishal - 12/18/2007 - 23:15
i hope that everybody that have nightblindess will soon get better
#14 - salani mareko - 12/13/2007 - 12:53
I was suffering or I am suffering from night blindness. I dont see clearly in the late evenings plus from last five years I have got specs. I think that was affect of smoking. But I think the night blindness has progressed and made my eye number to -3.
#13 - Sudhir - 12/12/2007 - 10:56
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