Is Your Contact Prescription The Same As Your Glasses Prescription
No, your contact and glasses prescriptions are different. Your optometrist has to factor in different measurements for each type of eyewear, which is why you need a separate contact lens exam to determine your contact lens prescription.
Your contact prescription will include a base curve and diameter in addition to the power of vision correction needed. These numbers ensure that your contacts fit comfortably and function as they should.
Knowing how to read your eye prescription will help you to understand these measurements and how they pertain to your eyewear.
Contact Prescription Abbreviations And Terms
Your contact lens prescription probably looks like a small table or grid. In that grid, youll see a mix of letters and numbers, each one corresponding to a crucial element of your prescription.
Because many people need different levels or kinds of vision correction in each eye, contact lens prescriptions usually have two sets of numbers on themone for your right eye, and one for your left. Here are the abbreviations youll almost always see on any contact prescription:
OD: Oculus dexter, meaning your right eye.
OS: Oculus sinister, meaning your left eye.
Brand: The brand of contact lenses prescribed by your optometrist. Different brands have different features and measurements. You can only order the brand thats listed on your prescriptionif you ever want to switch brands or try a new one, let your optometrist know.
BC: BC stands for base curve, which is the curvature of your contact lens . Its measured in millimeters and should align well with the curvature of your eye. Its always a number between 8 and 9. Some brands of contacts only come in a single base curve, and may not have a number listed. And, if you switch brands, you might get prescribed a different base curve. There are minute variations in fit across manufacturers, so its always important to consult with an optometrist before changing the contacts you wear.
Knowing A Contact Lens Diameter
Diameter or DIA is the distance across the surface of the contact lens measured in millimeters. The contact lens diameter determines where the contact lens will sit on your eye. The figure is usually between 13 and 15, and if the measurement isnt correct, the contact lens will be uncomfortable and may scratch your eye.
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How Do Glasses & Contact Lens Prescriptions Differ
Both glasses and contact lens prescriptions feature the amount of correction each eye needs to see clearly, but contact lenses require more information.
Your glasses prescription will feature the required correction listed in diopters and a symbol representing the associated refractive error, such as myopia or hyperopia. Contact lens prescriptions have other specifications not needed for glasses.
How Do I Read My Contact Lens Prescription
Remember: glasses and contact lens prescriptions are different.
If you want to purchase contact lenses, youll need a specific prescription from your eye care professional. In addition to the general parameters that weve mentioned, a contact lens prescription will include a Base Curve and a Diameter.
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How To Read Your Contact Lens Prescription
Unlike with glasses, a contact lens prescription will have a section dedicated to BC, which stands for Base Curve. This measurement tends to fall between the numbers of 8 and 10.
You will also find the diameter DIA of the contact lenses. This usually varies between 13 and 15mm.
Everything else will be the same as what you see on a glasses prescription, but the figures themselves will be different to your glasses prescription because of where the contacts are located on your eye. You will however see a section for colour in case your lenses are tinted or coloured, and the optician will usually specify a brand of contact lenses that they recommend for your particular needs.
Remember that unlike glasses prescriptions, contact lenses have an expiration date. The prescription will become invalid after one or two years, and you will need to get retested. You cannot buy contact lenses without a formal prescription, so it is important to get an eye exam regularly.
For extra help on which contact lenses are right for you, take a look at this helpful guide.
Can I Buy Contact Lenses If I Have Lost My Prescription
If you wear contact lenses already and need to replace them you can find all the information you need on your contact lens box.
The name brand name, the name of the contact lenses, the type of contact lenses are clearly displayed on the front of the box which make them easy to find, check out our website to see how easy it is to find your contact lenses online. Other important information you need can also be found on the box, normally on the end or the back.
With a basic contact lens prescription you will find all the information on the box – here you can clearly see the power is -1.75 and the base curve is 8.7 and the diameter is 14.0.
In a more complex toric lens prescription you can still clearly see the B.C is 8.5 and the DIA is 14.5.The power in this case is -4.00, the Cyl is -1.25 and the Axis is 160
If you need varifocal or multifocal contact lenses you will have extra information on your box, you can still clearly see the B.C is 8.4 and the DIA is 14.3. The power – in this case is -1.00 High. The ‘High’ is important as it can be High, Medium or Low and is linked to the Add Power – in this case you will notice the ADD +2.50. A Low add power would typically be under +1.25 and a medium from +1.50 to +2.25.
In all of these cases you can also see the expiry date.
A contact lens prescription can be the same as a prescription for glasses when:
– the prescription is a lower power, ie: -4.00 to +4.00- there is absolutely no astigmatism present
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When Converting Your Glasses Prescription To Your Contact Lenses Could Cause Problems
When you calculated the correct lens powers then the value CYL and A for Axis need to be chosen in order to be able to order contact lenses. The problem is in most cases those values also need to be rounded down or up. Presumably to the option next to the prescription. What I mean by this will get clearer when you have a closer look at the example below.
In addition to the first conversion example, we now have the CYL value and the A for the axis here. But in most cases depending on the contact lenses, you would choose the CYL value will be available in -1.25 or -1.75 diopters instead of 1.50D. my recommendation for the lower value.
With the axis things can get a little tricky even though you made no mistake during the conversion. When you look at the axis the perfect value will 7 degrees in which the contact lens should correct your vision. But in most cases only 10 and 0Â° will be an option. Go for the number which is closest to the actual prescribed axis.
Now here comes the tricky part. When the contact lens arrives only an eye care professional can see if the lens is stabilized in the optimal position. It is one thing to perform the conversion and round the values up and down but when rotation comes into play you might see blurry and think you missed something during the conversion although everything was made correctly. But the lens due to the position of the eyelids for example gets rotated in a position that has nothing to do with the 0Â°, 7Â°, or 10Â°.
Contact Lenses Vs Eyeglasses Prescription
- Myopia, or nearsightedness, which causes objects at a distance to appear blurry
- Hyperopia, or farsightedness, which causes objects up close to appear blurry
- Astigmatism, which can cause blurred vision at any distance
Both options are highly effective, but they arent exactly the same. In fact, if you want contact lenses and eyeglasses, youll need 2 prescriptions and likely 2 eye exams.
Eyeglass prescriptions are based on your vision needs, but these prescriptions also account for the distance between your eyes and the physical lens. Your glasses sit away from your face, and that small distance in between the lens and your eyeball changes your prescription.
Contact lenses sit directly on your eye, so theres no need to accommodate the extra distance between your eyes and the corrective lens. Your contact lenses may also require extra fitting depending on the shape of your cornea.
However, both prescriptions need to be renewed regularly . Your optometrist will let you know when you should return for an updated prescription.
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Why Do Contact Lenses Require A Prescription
Contact lenses are comfortable and a great form of vision correction, but they do carry some risks if theyre not worn and cared for as directed. Contact lenses are classified as medical devices by the FDA, and should only be purchased when you have a prescription for them. Wearing contacts without a prescription, or wearing a different brand than prescribed , can seriously endanger your eye health and will not adequately correct your visiononly an optometrist or ophthalmologist can determine the type and degree of vision correction you need.
What Is The Importance Of The Contact Lenses Diameter
The diameter of a contact lens is important because it determines how well the lens will fit the eye. A contact lens that doesnt fit well can lead to discomfort and even medical complications.
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How To Read A Multifocal Contact Lens Prescription For Presbyopia
If you have presbyopia and are a good candidate for multifocal contact lenses, youll see one or both of the following terms on your prescription. Sometimes these are referred to as progressive contacts.
ADD: ADD stands for addition or additional magnification. It might also be listed as Add Power or Extra Strength. This is another measure of vision correction for near vision that will help with close-up tasks. It will either be a number in diopters, or be a written level: low, medium, or high.
D/N: D/N stands for dominant or nondominant eyemultifocal and bifocal contacts have different levels of vision correction for each. Your dominant eye is associated with distance vision, and your nondominant eye is associated with near vision. Only some brands of multifocal contacts use D/N, so you might not see this term on your prescription.
Eyeglasses And Contact Lenses Arent Made The Same
Different types of materials are used to construct contact lenses versus glasses lenses. In general, modern contacts are made from hydrogel or silicone hydrogel. This material is oxygen permeable, keeping your eyes healthy and helping to preserve the moisture in your contacts. Newer eyeglasses are made from advanced plastics, which are thinner, lightweight and more scratch-resistant than older glass versions. The different materials affect the refractive qualities of eyewear, leading to different prescriptions. Using the results of your personalized eye exam and taking your choice of eyewear into consideration, our eye doctor at Advanced Eyecare Center will determine your prescription for eyeglasses and/or contact lenses.
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Is It Possible To Use An Eyeglasses Prescription To Get Contact Lenses
No! The prescription for eyeglasses significantly differs from contact lenses. An eyeglasses prescription wont be correct and must not be used to get contact lenses. Your eye prescription cannot be used interchangeably. And people who wear or require eyeglasses dont always wear contact lenses. To get an accurate prescription for eyeglasses and contact lenses, make a visit to your local optometrist and get your eyes examined to understand if you require contact lenses or not.
Note: If you plan to wear both eyeglasses and contacts at different times based on your needs, youll have to get two different prescriptions.
Not Everyone Is A Candidate For Contact Lenses
Theres much more to qualifying for contact lenses than just ordering contacts with the powers listed in your eyeglasses prescription. An eye exam by a qualified professional is needed to check if your eye health is suitable for wearing contacts and to determine which particular type of contact lenses. We offer comprehensive contact lenses eye exams and fittings in Manhattan Beach and Redondo Beach, California.
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Where Is The Power On My Contact Prescription
You can find the power in the PWR/SPH column of your prescription. This field might also be labeled Sphere or Power. The corresponding number will be positive or negative, and represents the diopters of vision correction needed to counteract a refractive error in your eye and help you see clearly.
How To Convert Your Glasses Prescription To Contacts
In this article, you will learn how to convert your glasses prescription to contact lenses. There are a few exceptions you need to keep in mind when doing the conversation. The easiest way to convert your glasses prescription into your contact lens prescription is to use a conversion sheet I listed at the end of this article.
In this sheet, you will find three columns. The middle shows the spectacle power. This spectacle power is the same as the lens power on your prescription under the acronym SPH for the right and the left eye. When the lens power is negative you need to check what the needed prescription will be on the left of the conversion sheet.
In this case, you would be shortsighted. When you are farsighted and the lens power in your prescription is positive you need to look in the right part of the sheet to what your prescription needs to be converted.
What you need to know is such a conversion sheet uses standard parameters. The supposed distance in such a case is 12mm between your cornea and the back surface of the lens in your glasses.
While this is obviously an average your actual distance from the standard could differ a lot. And with this, the conversion needs to be calculated with a formula you find below.
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What Age Stop Wearing Contacts
Contact lens wearers usually drop out of contact lenses between the age of 40 to 50. This is due to two primary reasons according to most studies conducted with patients and eye doctors. These two reasons are that patients have a harder time reading up close with their contacts, and that the contacts feel dry.
What If I Cant Wear Regular Contact Lenses
Regular contact lenses dont work for everyone. Most standard contact lenses are soft and sit over the cornea. While these lenses can be a great option for many people, certain conditions and eye issues can make wearing regular contacts feel impossible.
Fortunately, there have been significant advancements in contact lens technology and development.
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Are Contact Prescriptions The Same As Glasses
Are you confused about what to wear with eyeglasses or contact lenses?
It is not as big a matter as you think.
You can wear both of them whenever you want.
If you think glasses dont suit you, you can get lenses. On the other hand, if you find difficulty while wearing lenses, get eyeglasses.
But, actually, the main query arecontact prescriptions the same as glasses?
Let me tell you!
Precisely speaking No, they are not the same. No doubt both have some similar factors but they are different from other aspects. You cant use one for the other. They are different because lenses fit your eyes and glasses are placed at a distance from your eyes. Thats why lenses require more information about the width and curve of lens.
You can get many options while selecting glasses and lenses. There are many stylish frames you can buy according to your face. If you want to hide the secret that you have weak eyesight, contact lenses are the best option.
It is easy to wear eyeglasses as you can take off them anywhere you want. It is easy to carry them without any fear of damage. Contact lenses need more care as they are so delicate and sensitive.
How To Obtain Your Contact Lens Rx From Product Box
Take note of the information presented in a prescription, including: power, base curve, diameter and brand name.Bifocals and astigmatism prescriptions typically have additional information.
Learn the abbreviations used in a prescription:
- OS – for left eye
Look for additional abbreviations used for bifocals:
- ADD – for addtional power
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Benefits Of Wearing The Right Prescription
Wearing the right eyeglasses or contact lenses helps you see the world more clearly. When you consistently book eye exams, you keep on top of your eye health. You have an opportunity to discuss changing vision needs.
But sometimes vision changes between your regular scheduled appointment. Or your eyeglasses break. Or you forget to re-order your contact lenses. So what happens when your prescription is wrong or you borrow someone elses corrective lenses?
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Can I Use My Eyeglass Prescription For Contact Lenses
Glasses and contacts are similar, but they have a few key differences in how prescriptions work. Continue reading to learn more, including if you can use your glasses prescription for contact lenses.
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