I Have A Prescription How To Read It For Different Uses
For progressive or bifocal glasses, the prescription can be read as:
For single vision distance use, the prescription can be read as:
To convert a multi-focal prescription with ADD values for single vision distance use, simply remove the ADD values. The correction for the astigmatism will not change, so the cylinder and axis will remain the same, regardless of the change in focal distance. Use the original distance PD listed in the prescription.
For single vision computer use, the prescription can be read as:
To convert a multi-focal prescription for single vision computer use, simply combine half of the Add number and the Spherical number . For example, if the Add were +2.25 and the OD-Sph was -0.50, the new OD-Sph for computer glasses would be +0.75 if the Sph were +0.25, the new Sph would be +1.50. Consequently, the Add will then become zero, the default. The correction for the astigmatism will not change, so the cylinder and axis will remain the same, regardless of the change in focal distance. Narrow the PD by 1-2 mm. If the PD of your basic prescription is 29.5/31.0, the PD for computer glasses would be 29.0/30.5 or 28.5/30.0
For single vision reading use, the prescription can be read as:
That’s it about prescriptions.
Understanding Your Eyeglass Prescription
After your eye exam, the doctor hands you a small slip of paper covered with confusing numbers. You take it, without even looking at it, straight to your optician, who uses it to make your next pair of lenses. At no time do you understand any part of the process. Sound familiar? While you dont really need to understand your eye prescription, in the sense that you dont really need to understand how electricity works in order to use itits definitely good to know what is going on with your eyes so you can track any changes, spot any mistakes, and understand what your prescription means to your day to day vision. Here, well demystify the eyeglass prescription so you can finally know for sure what the numbers mean.
If You Do Not Wear Your Prescription Glasses As You Are Required To Does It Lead Your Eyesight To A Worsened State
If you are worried about not wearing your glasses regularly and facing repercussions like eye damage or drastically weakened sight, you can rest easy with the knowledge that the worst to come is the resurfacing of the symptoms specific to your issue like headaches, blurry vision or having to strain your eyes or squint when you have myopia.
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Here Is The Full Numbers Breakdown:
SPH: Prescription spherical correction ranges between 0.00 and +/- 20.00. The farther away from 0 your prescription is, the stronger the lenses are made to correct vision problems.
Cylinder: For this astigmatism value, the value will usually be between +/-0.25 to +/-4.00. These numbers tell eye care specialists how cylindrical your lenses should be to which focuses light into a line instead of a point.
Axis: For this additional astigmatism value, the value ranges between 1 and 180. The vertical position is represented by the value 90 while the horizontal position is represented by the value of 180.
Add: The additional reading number will range between +0.75 and +3.00. Both eyes will usually require the same value in any set of prescription eyewear.
PD: Pupillary distance for the average adult ranges between 54-74 mm. For kids its between 43-58 mm. This lets vision care specialists know where to place the correcting features on your eyeglass lenses.
Prism: This value may go up to 10 and be measured in prism dioptres or in a superscript triangle if the prescription is written by hand.
Base: The direction of the prism will be represented here by the base. Either up, down, in or out.
Your Eye Prescription Is Yours To Keep
The Optical Consumer Complaints Service clarifies that “an optician is obliged to provide you with the written prescription following the eye examination. You are then able to take the prescription to another practice.
“By law, the prescription must provide the basic results of the eye examination.
“There are however other measurements or results which are needed to dispense glasses but these will need to be taken by the ‘dispensing practice’ . This can sometimes cause difficulties when purchasing online but the law does not require the examining optometrist to include these details as they may vary depending on the type of frames and lenses selected.”
The rule is intended to protect the “portability” of your spectacle prescription, allowing you to use it to buy glasses from the optician of your choice.
Page published on Monday, December 30, 2019
Page updated on Thursday, June 2, 2022
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What Are Od And Os
They are abbreviations of Oculus Dexter and Oculus Sinister. These are the Latin terms for the right and left eyes. The OD indicates your right eyes parameters and OS shows your left eyes parameters.
Nowadays, these abbreviations are common in being replaced by RT and LT because theyre easier to decipher .
What Does Sph Mean For Glasses
SPH generally stands on the prescription to measure the amount of lens power. It was prescribed to treat nearsightedness or farsightedness. The lens power is calculated here in diopters .
How often do you define this? Its pretty straightforward you need to determine whether the prescription indicates a minus sign or not. Minus sign here will signify the problem of nearsighted patients. If you find the negative sign, it will define that youre struggling with farsightedness.
In a word, SPH means the correction of nearsightedness or farsightedness spherically. Or it was equal in all the meridians for the eye.
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Add Vs Powers For Readers
Some people think the ADD number is the power needed for over-the-counter reading glasses , but it’s not the same thing.
To get the right number, you need to do a little math.
To find the right reading glasses, add the sphere number to the ADD number.
In the above example, for the right eye, this would be -2.00 and +1.75, which equals -0.25. For the left eye, add +1.00 and +1.75 to get +2.75.
Next, look at the cylinder measurement and the axis measurement.
In the example, the correct number for the right eye is -0.25 -0.50 x 180 while the correct number for the left eye is simply +2.75.
The example was chosen to show the difference between nearsighted and farsighted prescriptions. For most people, the numbers are usually similar in power for both eyes.
How Eyeglasses & Contacts Work To Correct Your Vision
To understand how eyeglasses and contact lenses correct your vision, a brief understanding of how the eyes work may be helpful. The basic steps of vision are as follows:
- When you focus on an object, first light passes through the cornea, which is shaped like a dome and bends this light to help the eye focus.
- The light enters the eye through your pupil, and the amount of light that is let in is controlled by the iris.
- Next, this light passes through the lens of your eye. The lens and the cornea work together to focus light correctly on the retina, where turn the light into electrical signals.
- These electrical signals travel to the optic nerve and then to the brain, where the signals turn into the images you see.
If there is an issue with any of these steps, you may have trouble seeing correctly. A specific lens tailored to your needs can help correct your vision.
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What Od And Os Mean
The first step to understanding your eyeglass prescription is knowing what “OD” and OS” mean. They are abbreviations for oculus dexter and oculus sinister, which are Latin terms for right eye and left eye.
Your eyeglass prescription also may have a column labeled “OU.” This is the abbreviation for the Latin term oculus uterque, which means “both eyes.”
Though the use of these abbreviated Latin terms is traditional for prescriptions written for eyeglasses, contact lenses and eye medicines, some doctors and clinics have opted to modernize their prescriptions and use RE and LE instead of OD and OS.
On your eyeglasses prescription, the information for your right eye comes before the information for your left eye . Eye doctors write prescriptions this way because when they face you, they see your right eye on their left and your left eye on their right .
Other Details On Your Eye Prescription
Your spectacle prescription contains other terms and abbreviations as well. These include:
Sphere . This indicates the amount of lens power, measured in dioptres , prescribed to correct shortsightedness or longsightedness. If the number appearing under this heading has a minus sign , you are shortsighted if the number has a plus sign or is not preceded by a plus sign or a minus sign, you are longsighted.
The term “sphere” means that the correction for shortsightedness or longsightedness is “spherical,” or equal in all meridians of the eye.
Cylinder . This indicates the amount of lens power for astigmatism. If nothing appears in this column, either you have no astigmatism, or your astigmatism is so slight that it is not really necessary to correct it with your spectacle lenses.
The term “cylinder” means that this lens power added to correct astigmatism is not spherical, but instead is shaped so one meridian has no added curvature, and the meridian perpendicular to this “no added power” meridian contains the maximum power and lens curvature to correct astigmatism.
The number in the cylinder column may be preceded with a minus sign or a plus sign . Cylinder power always follows sphere power in a spectacle prescription.
Meridians of the eye are determined by superimposing a protractor scale on the eye’s front surface. The 90-degree meridian is the vertical meridian of the eye, and the 180-degree meridian is the horizontal meridian.
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Od Vs Os Prescription
OD and Os are the two medical symbols that the physician usually uses to define the condition of your eyes. The abbreviations of both OD & Os are denoted by your right and left eyes. In brief, OD is referring to the whole word of oculus Dexter. It is the Latin phrase for the right eye.
Again, the word Os here define the short form of oculus sinister, which means left eye in Latin.
On the other hand, your eye prescription also contained the column labeled OU. It is an abbreviation of oculus uterque that means both eyes in Latin.
These abbreviated or symbolic terms are very general on the prescriptions for glasses. However, somewhere, you may find RE and LE instead of OD & OS. Your eye specialist prefers those signs this way when they face you because they see your right eye on their left and the left eye on their right.
What Does 225 Mean For Glasses
If your prescription reads +2.25, that means your eyeglasses need 2.25 diopter of strength to correct farsightedness. Remember, the higher the number, the more correction your vision needs.
Again, 2.25 glasses are a mild number between +/- 2.25 to +/- 5.00. It is also required to moderate numbers. +2.25 also means that the patients belong to long-sightedness, so objects up close appear more blurred.
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How To Read Eye Prescriptions
After having an eye exam, many people wonder how to read eye prescriptions. If you dont know what OD and OS eye abbreviations mean, youre not alone. The good news is reading eye prescriptions isnt science fiction. All those abbreviated terms make perfect sense, and all you need to do is learn which refers to what.
In this article, we will help you understand the meanings of the different letters and columns you may see on your eye prescription. Once you understand the way a prescription describes your vision, you will be able to read it with a deeper understanding.
What Is The Difference Between A Regular Eyeglass Prescription And A Contact Lens Prescription Can We Buy Contact Lenses Using Our Eyeglass Prescription
The difference between the two lies in the distance between the prescribed glasses or lenses and the eyes, and the specific details required for contact lenses.
Between the eyes and prescription glasses is a little distance, which is hard to miss. The distance is over 14 millimeters. The tests you are made to take for an eyeglass prescription are taken according to the distance. On the other hand, your contact lenses rest right on top of your irises, with no gaps between them, visible or not. This decreased distance requires further specifications from the tests run by your eye care provider.
So, no, you will not be able to get yourself contact lenses through your eyeglass prescriptions. Of course, you can always buy non-prescription contact lenses without any prescription at all.
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What You Need To Know About Your Eyeglass Prescription
December 7, 2020 by Dr. Mary Ann Zastrow
Those who suffer from nearsightedness, farsightedness, and astigmatism usually wear eyeglasses and contact lenses to improve their vision. While reading glasses are available in drugstores, its still better to visit a specialist for an eye exam. Keep in mind that routine eye exams help in the early detection of vision-loss causing diseases like glaucoma.
If youre given an eyeglass prescription, youre probably wondering what the numbers and abbreviated terms mean. In this blog post, well discuss everything you need to know about your eyeglass prescription.
Update Your Contact Lens Or Eyeglass Prescription
Because Della Optique is a one-stop solution for those who need glasses or contact lenses, there is no need to decipher your prescription. We conduct comprehensive eye exams, write the new prescription and order your glasses for you.
And even though we start and complete the entire process, we always walk our patients through their eye or contact lens prescription so that they feel well-informed and able to partake in their own eye health decisionswith our guidance, of course.
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Understanding Your Contact Lens Prescription
Contact lens prescriptions are different from eyeglass prescriptions because they take different measurements of the eye. If you wear contact lenses, you will need a prescription that is completely separate from your eyeglass prescription.
Contact lens prescriptions will include some of the listed measurements from above such as the OD and OS , their sphere power , cylinder , and axis. Additionally, they will include a Base Curve , a Diameter , and also the type of contact lens that has been approved by your optometrist.
BC: The base curve is the measurement that indicates the curvature and shape of your contact lenses. Your optometrist measures the steepness or flatness of your cornea during an examination and determines which base curve is best suited for your eye.
DIA: The diameter is the measurement that indicates the length your contacts need to be to completely cover your cornea.
What Does Sphere Cylinder And Axis Mean
In the context of an eye prescription. Sphere is basically a measure of how strong your prescription needs to be. The number marked axis describes the orientation of astigmatism. It will be a number between 1 and 180. The number under cylinder provides the lens power needed to correct the astigmatism.
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How To Read A Glasses Prescription The Numbers Demystified
After an eye exam, the optometrist writes a prescription containing the information needed to correct your vision. By reading this article, you will notice that it contains many numbers and abbreviations. Are you curious to know what they mean? Here is some information to help you better understand your prescription.
First and foremost, your prescription is divided in two parts: one for each eye. On the first line you will find the letters O.D., this is an abbreviation from the Latin words Oculus Dexter, which means, right eye. On the second line, we will find the letters O.S., which stems from the Latin words Oculus Sinister, referring to the left eye.
Now, let’s take a look at what is in each section of your prescription.
What Is Eyeglasses Prescription
There is no detailed information in your eyeglasses prescription about your spectacles. How well you would be able to see better with the left eye than the right and fluid pressure of the eyes. It indicates either your risk of glaucoma or if you already have glaucoma it indicates the efficiency of your treatment.
Have you ever been curious to know what the number and letters mean for your eyesight? By decoding your eyeglasses prescription in order to get a better understanding of what happening with your vision like knowing about what is going on with your vision.
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What Does Cyl Mean For Glasses
CYL is a common sign that doctors or eye specialists often attach to their eye prescriptions. The complete form of cyl is the cylinder. The meaning of the cyl eye prescription is tracing the amount of lens power that is needed for astigmatism. It works to ensure the sphere power that you will find on an eyeglass prescription.
CYL means Cylinder
Again, you can see the number mentioned in the cylinder column that contains a minus sign or a plus sign. Here, minus is for cure nearsighted astigmatism, and plus is for cure farsighted astigmatism
If you didnt find any number in the column section on the prescription that means you dont have astigmatism. However, it is often defined that the patient has very little sufferer of astigmatism.
Along with these, the term cylinder also defines the lens power added to correct astigmatism. It isnt spherical. But the period is shaped and well-engineered so that one meridian doesnt belong to any added curvature.
The meridian perpendicular here stands for correct and correct astigmatism. Then, How does it work? The meridian perpendicular had no added power. This power will include maximum power and lens curvature.
Meanwhile, the meridian of the eyes is worked by superimposing a protector scale on the eyes front surfaces. .