ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

What is night blindness

Updated on August 17, 2012


People are fast in saying that they are night-blind. They don’t see for a while in the dark and cry I am night-blind. Everyone has trouble adjusting their eyes from dark to light and vice versa, but you're not immediately night-blind.

What is night blindness exactly and what can you do against it?

What is night blindness

You're always night-blind in both eyes. Someone who is night-blind sees nothing in the twilight or darkness. Also the eyes have difficulties adjusting from bright light to darkness. Everyone always sees less in such a situation but eyes from people with night blindness can not alter to the new situation and their visibility remains poor.

You can test whether you are night blind by going to the movies. If you're in the dark and you will see the person next to you within five minutes, then there is nothing wrong. Moreover, the visibility in dark improves about half an hour. Then you have reached the best visibility in the dark.

Cones and rods of the eye!
Cones and rods of the eye!

What are the causes of night blindness

Night blindness is usually hereditary, but a lack of vitamin A can also be a cause.

In the retina of the eye you have two types of sensory cells, the rods and cones. The rods detect light, and cones provide colour vision. The cones are much more specific and sensitive than the rods. When you’re night blind the rods work less well. Vitamin A is the precursor material of the so-called rodopsine that is present in the rods.

If light is observed rodopsine falls apart what causes an impulse to go the brains. In this way light is observed. Then, the rodopsine is rebuilt and can detect light again. This is also the reason that when you’re looking at very bright light, you don’t see nothing for a while. All the rodopsine is used and must be rebuilt, until then, you see stars or a spot for the eyes. If you have a deficiency of vitamin A rodopsine can not be formed. This allows less light to be observed by the rods, causing you to suffer from night blindness. Vitamin A deficiencies may also occur if you have an illness in which your body does not absorb vitamin A, such as chronic gastritis or chronic liver disease.

Can you prevent night blindness

You can not prevent night blindness from happening. Only as a result of vitamin A deficiency, you could use a supplement. But be careful! An overdose of vitamin A could also be harmful.

If the night blindness is caused because of the fact that your body can’t absorb enough vitamin A, you should first eliminate the other disorders and causes of that.

The effects of night blindness

Night blindness has basically little impact. Only driving at night is dangerous and in the dark night blindness people have troubles finding their way.

If you adapt to these situations by making sure you're not driving on a dark road alone or that someone else takes you home, you could easily live with night blindness.

The treatment of night blindness

If you suffer from night blindness you should always go to the ophthalmologist. He will first examine whether the disorder is hereditary or that the night blindness is caused by retinal detachment for instance. If this is not the case, then may be vitamin A supplements are prescribed.

Often, however, additional research should be done, because vitamin A deficiencies simply doesn’t occur often.


Night blindness is an annoying disease, but you can live with. If you feel that you’re suffering from night blindness, then go to the ophthalmologist and let yourself be checked.


    0 of 8192 characters used
    Post Comment
    • lilalollie profile imageAUTHOR


      9 years ago from The Netherlands

      Thanks very much!

    • rajan jolly profile image

      Rajan Singh Jolly 

      9 years ago from From Mumbai, presently in Jalandhar, INDIA.

      lilalollie, this is an interesting hub. Very enjoyable and informative read.

      Voted up, useful and interesting.


    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at:

    Show Details
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the or domains, for performance and efficiency reasons. (Privacy Policy)
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)
    ClickscoThis is a data management platform studying reader behavior (Privacy Policy)