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How do you determine your vision in terms of 20-X from your contact lens power in diopters?
Wiki User
∙ 8y ago
It cannot be done with any precision.
With a near-average pupil size, an eye capable of good vision when corrected will have about 20-200 vision at -3.00 dioptres uncorrected, or 20-24 to 20-60 at -1.00 but a young person will not be nearly so badly affected with the equivalent + prescription.
Pupil size will make an enormous difference, the "pinhole-camera" effect. With a 1mm pinhole in a piece of card held near the eye, the vision can be surprisingly good, whatever the amount of missing correction.
With the contact lens correction in place, the vision will depend on the accuracy of the prescription and the optical and neurological quality of the eye. A needed -10 contact lens might give 20-20 vision, but an eye with cataract might have poor vision even if not needing any optical correction. A strong contact lens would not improve the situation but worsen it.
ANSWERS
There is no exact correlation because pupil size enters into it. The more light in the room the smaller the pupil and the better the vision for a given diopter. Only an approximation can be given. Also a plus diopter correction will affect visual acuity more than a minus diopter correction because of the way accommodation can neutralize some of the minus power. The younger the individual the greater the amount.
Wiki User
∙ 8y ago
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Can you tell your eye refraction level from your contact prescription?
Yes, your contact prescription includes information about your eye refraction level. It indicates the amount of correction needed for your vision, measured in diopters, to bring your eyesight into focus. This information helps the optometrist or ophthalmologist determine the type and power of contact lenses you require.
What is the power of a convex lens with 10cm focal length?
1.0 diopters
What is theeffective power of the combinaction of two lens in contact having power 5D 3D and 5D -3D?
I assume those are diopters. When combining two lenses, you can simply add their power. More precisely, add algebraically, that is, taking their signs into account.
Is 2 diopters a positive power?
If it is written as +2 Diopters it is positive, ie a converging lens. If it is written as -2 Diopters it is negative, ie a diverging lens. Diverging lenses are prescribed for myopia, or short-sightedness. Converging lenses are prescribed for hypermetropia or long-sightedness.
Is laser vision correcton 100 percent effective?
Laser vision correction is not 100% effective but it provides correction to the 1/100 of a power, which is nearly 100%. To a human being who required glasses or contact lenses before, it will be a paramount change.
How do you convert from meters to diopters?
Take the reciprocal of the focal length measured in metres. The optical power of a lens (or mirror) with a focal length on 2.5 metres is 1/2.5 = 0.4 dioptres.
How do you determine your vision in terms of 20 X from your contact lens power?
It cannot be done with any precision.With a near-average pupil size, an eye capable of good vision when corrected will have about 20-200 vision at -3.00 dioptres uncorrected, or 20-24 to 20-60 at -1.00 but a young person will not be nearly so badly affected with the equivalent + prescription.Pupil size will make an enormous difference, the "pinhole-camera" effect. With a 1mm pinhole in a piece of card held near the eye, the vision can be surprisingly good, whatever the amount of missing correction.With the contact lens correction in place, the vision will depend on the accuracy of the prescription and the optical and neurological quality of the eye. A needed -10 contact lens might give 20-20 vision, but an eye with cataract might have poor vision even if not needing any optical correction. A strong contact lens would not improve the situation but worsen it.ANSWERSThere is no exact correlation because pupil size enters into it. The more light in the room the smaller the pupil and the better the vision for a given diopter. Only an approximation can be given. Also a plus diopter correction will affect visual acuity more than a minus diopter correction because of the way accommodation can neutralize some of the minus power. The younger the individual the greater the amount.
What is the meaning of eyesight 2020?
In the term "20/20 vision" the numerator refers to the distance in feet from which a person can reliably distinguish a pair of objects. The denominator is the distance from which a person with standard VA (that is, with 20/20 vision) would be able to distinguish them-the distance at which their separation angle is 1 arc minute. The metric equivalent is 6/6 vision where the distance is 6 meters. Twenty feet is essentially infinity from an optical perspective (the difference in optical power required to focus at 20 feet versus infinity is only 0.164 diopters). For that reason, 20/20 vision can be considered nominal performance for human distance vision; 20/40 vision can be considered half that acuity for distance vision and 20/10 vision would be twice normal acuity. The 20/x number does not directly relate to the eyeglass prescription required to correct vision; rather an eye exam seeks to find the prescription that will provide at least 20/20 vision.
What is the recommended home thermostat setting?
The temperature at which you are comfortable. If your question involves money-saving, then contact your local power company to determine the best setting.
What are the evil of power?
x-ray vision
Which word means the power of seeing?
vision
If you would like to wear colored contact lenses but they make your vision blurred are there any colored contacts you could wear that would not cause blurred vision?
AnswerIf you are wearing prescription lenses that are not meant for your eyes then that can cause them to blur your vision. Also, if the lenses have small pupil holes that cover your parts of your pupil when they are dilated (when it is dark) that can cause vision problems aswell. I have noticed when my vision is blury in contact, it is because they are dry.Plano lenses are great if you don't need lense power. Find a brand that you like that has a large pupil hole if you have trouble seeing in darker settings, and don't forget to use a good solution that will give them lots of mouisture
