20 50 Eyesight

Vision Without Glasses
eyesight eyesight is a ...

20-20 Vision

Author: udtekadapter

The purpose of standard eyeglass prescription is to give a person 20/20 vision, based on an arbitrary measurement developed by Hermann Snellen in 1862, which is much too strong. When was the last time you needed to see inch letters 20 feet away except for looking at the blackboard as a student? Actually 20/30 to 20/50 is enough for daily living and most of tasks, among which automobile drivers with licenses legally require only 20/40. Only airline pilots require 20/20.

The vision of 20/20 is that you can read the letters on the 20/20 line correctly when you stand 20 feet away from the Snellen eye chart, which is considered normal. If you have 20/30 vision, you can only see what a person with 20/20 vision can see at 30 feet when you stand 20 feet away from the eye chart. Analogically, with a 20/40 vision, you can see what a person with 20/20 can see at 40 feet when you stand 20 feet away from the eye chart.

From the above explanation, we can see that the first number is always 20 which is the distance to the eye chart while the second number is the distance at which a person with 20/20 could read the line. The lowest line that you can read on the eye chart stands for your visual acuity. The larger the second number is, the worse your vision would be. The Snellen eye chart is the standard on which most eyeglass prescriptions are based because it is considered scientific and infallible, although it is not that scientific at the beginning. In 1862, Hermann Snellen simply based his 20/20 vision measurement on the vision of an assistant whom he thought as a person with good eyesight.

Nearsighted eyeglass check are focused on and prescribed for 20 feet because all readings of the Snellen eye chart are done at 20 feet. Distance vision eyeglasses are suited for looking 20 feet and farther because eyes do not have to focus at this distance, but they are unsuited for looking closer than 20 feet because the eyes must focus to see objects closer than 20 feet.

The 20/20 eyeglasses make the nearsighted eyes adjust focus to see objects closer than 20 feet and further adjust focus to overcome the comfortlessness brought about by eyeglasses prescribed for 20 feet. The eyes are forced to adjust focus, only to result in more nearsightedness that eventually requires bifocal eyeglasses. The Snellen eye chart, upon which most eyeglass prescriptions are based, really measures one visual skill - our distance vision which is only one small part of our vision including near vision, peripheral vision, eye coordination, color perception, light sensitivity, endurance, etc. It is unnecessary to base our eyeglass prescriptions on 20/20 vision because it would eventually and finally harm our eyes.

Article Source: http://www.articlesbase.com/advertising-articles/2020-vision-2005223.html

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10 Responses to 20 50 Eyesight

  1. LuvDance<3 says:

    Is 20/50 eyesight bad?
    My school sent this paper saying we had to have this check up.. for my eyes.. will i have to wear glasses full time?? If so what are the best type of contacts.

    • Zazerick says:

      You might experience a little bit of blur on your eye at 20/50 eyesight, but it’s up to you whether or not you want to wear/have glasses, and contacts are something different than an eyepiece. is this for both eyes?

  2. The Dark Sniper says:

    Is my eyesight bad? 20/50 & 20/125 vision. Also, anyway to improve eyesight or keep it at its current state?
    I was wondering if my eyesight was bad, because I’m still relatively young (13), and I really don’t want to lose my vision.

    I’m going to get my first set of glasses soon, and I’m wondering if my eyesight will keep declining. Are there any ways to stop it from declining further or improving my eyesight? Also, when should I wear my glasses(ex: In the classroom or watching TV are some examples, when else?) I have heard that if you wear your glasses/contacts all the time, they will just cause your vision to decline even further.

    So overall, my questions:
    - Will my eyesight keep getting worse? (I have already attempted to limit my computer time to about half or a third of its original time)
    - Are there any ways to improve my eyesight, or at least keep its current stage permanently?
    - When are appropriate times to wear my glasses? (EX: During class, while watching TV) Do I wear them while using the computer?
    - If I don’t wear my glasses often, will my eyesight decline further?

    • ~*Baby Girl born in June!*~ says:

      With you vision being 20/50 and 20/125 your prescription is still relatively low. You will need glasses to see things at a distance clearly like the t.v, in school or at the movies. Once you get your glasses, you might find that you are more comfortable visually wearing them full time, but that is up to you. However, because you are only 13, chances are your vision will progressively get worse until you stabilize at around 18-20yrs old. Wearing glasses has no effect on making your vision worse, they will only make you feel more comfortable. You need glasses now because as you grow, so do your eyes. Prescriptions have to do with the shape of your eye. For example, in your case, you eye is longer than a person who requires no glasses. You need the glasses to help focus light into your eyes properly, so that you can see clearly.

      All in all your eyes are fine, but they will keep growing and changing until you fully stop growing.

  3. sung_from_my_soul says:

    What would -2.50 eyesight be in comparison to 20/20?
    People keep saying things like, I have 20/20 vision, etc, and I don’t know what I am. My prescription is -2.50 – the only website I found is saying that that’s legally blind, and I know I’m not. Help!

    • Footprintz says:

      There is no direct conversion , because it is a different measurement , but MOST people with a simple – 2.50 would be around 20/200 without any correction.

      20/200 is the level that determines legal blindness IF that was the best vision you could get even WITH glasses or contacts ON , in the best eye.

      You most likely have 20/20 with glasses on , which is the important measurement.

  4. la-la-la-laaa says:

    My eyesight is 20/70 and 20/50, whats my contact lens prescription?

    • Footprintz says:

      That’s like saying, I wear a size 8 shoe, so how fast can I run…

      20/70 and 20/50 is how you see the chart without glasses on, it doesn’t tell what prescription you need to see 20/20

  5. Louis says:

    IF you want to join the navy SEALs but have zero water experience and 20/50 both eyes?
    How can you prepare and how important is it that you are experienced with water? What about uncorrected eyesight? (NOT willing to have a PRK surgery) Can i wear contacts?

    • jeeper_peeper321 says:

      Your vision is fine, as long as it can be corrected to 20/20.

      The max vision is 20/200 uncorrected.

      Water experience isn’t important.

      Alot of seals have never seen the ocean before they get to Bud/s.

      Contract a Seal Modivator,

      They can give you the seal pre bud/s workout plan.

      The link below, is the link to the official seal webpage.

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