Take A Photo For Your Pd Measurement
Youll be asked to take a selfie with the magnetic card held between your eyebrows. This is done to measure your pupillary distance . This vital step ensures that the lens power of your eyewear is correctly centered.
GlassesUSA will then request your account information, and will provide you with your prescription, so that you can purchase glasses.
If you have a prescription on hand to compare your GlassesUSA prescription to, you can be better assured of its accuracy.
If information privacy is a concern to you, use any card that is credit-card sized or cover information like numbers and names.
- straightforward and easy to use
- fast and convenient process in the comfort of your home
- less expensive than visiting your eye doctor
Will Your Eye Prescription Change
Large fluctuations in your vision prescription over time arent normal and should be investigated . But small, gradual changes can certainly occur, especially as you and your eyes age.
Even if you dont think your vision is any different and youre not experiencing any worrisome symptoms, its a good idea to get your eyes checked every year. Annual eye exams ensure that an optometrist is monitoring your eye health and updating your prescription as needed.
How To Read An Eye Prescription
Eye care practitioners use standard terms, abbreviations, and measurements to write contact lens prescriptions. You have probably wondered what the incomprehensible scribbles of your ophthalmologist mean and if you could ever learn to decipher them. You may not need to know all of the abbreviations and numbers in your optical prescription. However, learning how to read eye prescriptions, at least the basic terms, is useful, especially if you shop online.
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How Is A Contact Lens Prescription Different Than Glasses
Believe it or not, you can get multiple prescriptions for corrective eyewear.
Weve broken down the differences between contact lenses and eyeglasses so you can make the right choice for your eyes. If you need recommendations, were always here to help.
What Do Contact Lens Prescriptions Require
Eyeglasses typically sit 12 millimetres from your eyes while your contacts rest directly on them. This difference means that the power of your contact lens prescription will be less nearsighted.
Besides this difference, your contact lens prescription has other factors affecting it. These specifications include:
- Base curve : This measures the curvature of the back surface of the contact lens it helps to ensure your lens isnt too loose or tight
- Diameter : Your lens diameter relates to the specific size of lens you require it works with your base curve to determine your lenss fit
- Lens brand or material: Prescriptions require lens brand or material because each lens material has a different level of oxygen permeability
- Expiration date: Your contact lens prescription is typically valid for a year youll need a new examination to buy contacts after your prescription expires
There are many differences between glasses and contact lens prescriptions, but that shouldnt stop you from getting contact lenses. If youre interested in wearing contacts, a contact lens exam can help your optometrist determine the best lenses for your needs.
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What Do Od And Os Mean
The first part of getting what your eyeglass prescription means is determining what OD and OS mean. They abbreviate the words oculus dexter and oculus sinister: Latin words for right eye and left eye. You may also see a column labeled OU, and this abbreviates the Latin term oculus uterque. This means both eyes.
Nowadays, you will just see the abbreviations RE and LE rather than the more confusing OD and OS. On your eyeglasses prescription, the information for your right eye comes before the information for your left eye . This is because eye doctors see your right eye on their left and your left eye on their right .
Your eyeglass prescription will also contain others terms and abbreviations such as:
Sphere : The amount of lens power, measured in diopters , which corrects nearsightedness or farsightedness. If the number under this heading features a minus sign , this means youre nearsighted if it has a plus sign , this means youre farsighted.
Cylinder : The amount of lens power for astigmatism. The number in this column may be preceded with a minus sign or a plus sign .
Axis: This is the lens meridian with no cylinder power, meant to fix astigmatism, represented by a number between 1 and 180. The number 90 shows the vertical meridian of the eye, and the number 180 shows the horizontal meridian.
Prism. This is the amount of prismatic power, measured in prism diopters that compensates for eye alignment problems.
How To Read Your Eyeglass Or Contact Lens Prescription
When you look at your eyeglass or contact prescription, you will see a bunch of numbers and letters listed but you may not really know what they mean. In fact, you may even know which power is for which eye, but you still dont know why. Were here to educate you on how to interpret your eyeglass or contact lens prescription.
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A Note On Pupillary Distance
Your pupillary distance on prescription is the distance in millimeters between the center of your pupils . The PD indicates where youll be looking through the lens of your glasses. Its important to measure PD eye prescription correctly as inaccuracies can lead to eyestrain and distorted vision. Your optician will measure PD when fitting you for glasses.
The Takeaway: Are Multifocal Contacts Worth It
Your trusty Magic 8 Ball would probably say, All signs point to yes. If you need more than one prescription strength and would prefer not to use glasses for close-up work, then multifocal contacts may be the perfect solution. Book an eye exam if youre interested in multifocal contacts, and find out whether theyre right for you.
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A Guide To Understanding Glasses Prescriptions
If you have had an eye exam recently, your eye doctor may have given you a prescription for either glasses or contact lenses. The prescription describes in numerical terms how the lenses of your new eyewear must be made to allow you to see clearly when wearing them.
Each field of an eye prescription covers a specific aspect of your vision. One eye can need one set of optical corrections. The other can need the same set or something different.
Although they can be similar, eyeglasses prescriptions and contact lens prescriptions are not interchangeable. If you want to wear contact lenses instead of glasses, let your eye doctor know before your eye exam begins. This will let them know to make a few additional measurements during your exam.
What Is The Highest Eye Prescription
Collaboration between Franco-Slovak experts enabled the need evaluation, design, manufacture and fitting of -108 diopter lenses to correct what is probably the world’s highest degree of myopia. This record, set in February 2016, topped the previous achievement of -104 diopters set by the same team in January 2015.
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Can I Obtain My Contact Lens Prescription
You are entitled to a copy of your contact lens prescription once it has been finalized. The point at which your Rx is final is the decision of your eye care practitioner.
In some cases this can occur after the diagnostic fitting. In many cases notably with GP lenses and specialty designs such as bifocal, toric, keratoconus, or post-surgical it may take several visits before a successful fit has been achieved and a prescription can be provided.
If the lenses will not be dispensed by the prescribing practitioner, it is important that whoever fills the prescription does so completely and accurately. A soft lens Rx typically includes a lens material name, design, power, base curve, and diameter. GP lens prescriptions usually have this information and more, such as the peripheral curve radii, center thickness, a special peripheral design and an optical zone diameter.
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Can I Use My Glasses Prescription For Contact Lenses
The simple answer to this question is no you cannot and should not use your glasses prescription to try to calculate your contact lens prescription. It should also be noted that not everyone who needs glasses can also wear contact lenses, it is important that you are examined separately. Some people have sensitive corneas or other eye related complications and will simply never be able to adapt to wearing lenses.
What Are The Differences Between A Contact Lens Prescription And Glasses Prescription
The optics of the lenses in spectacles and contacts are different. This is because glasses are perched on your nose, at a short distance from your eyes, whereas contact lenses sit on the surface of your eye. Therefore, the two need different prescriptions to give you the best vision correction, and you should not transfer your prescription manually from glasses to contacts. If you wear glasses and are thinking about contact lenses, you will need to see your optician for a contact lens consultation.
A Note About Colored Contact Lens Prescriptions
A contact lens fitting and a prescription written by a licensed eye care professional are required even if you have no need for vision correction and want only “non-prescription” colored contact lenses or special-effect contact lenses to change the appearance of your eyes.
A contact lens, regardless of whether it is used for vision correction or cosmetic purposes, is a medical device, and selling any type of contact lens without a prescription is illegal.
Page published on Thursday, January 10, 2019
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When Contacts Are The Better Choice
Contact lenses are a better choice for more active people. This doesnt mean you cant be active if you wear glasses, but contacts make it easy to engage in physical activity at any moment without concern for breaking your glasses.
Contacts do not interfere with your field of vision as glasses do when they block part of your peripheral vision.
Many people choose contacts as their preferred eyewear for aesthetic reasons. They prefer how they look without glasses or theyve never worn glasses and the sudden change in their appearance bothers them.
Contact lenses are also more convenient throughout the day. Contacts require more care and cleaning, but you dont need to worry much about them throughout the day. They dont make your face sweat, they dont fog up, and they dont slip down your nose.
Daily contact lenses are a convenient way to minimize care and cleaning and provide all the convenience of contacts.
Can Anyone Get Prescription Contacts
For the most part, yes! Contact lens prescriptions can be written for almost anyone, with a few limitations. The first is that doctors won’t usually write one for young children, and prefer to wait until they’re a little older.
There are also some eye conditions that can prevent you from wearing contacts comfortably, so that’s something to discuss with your doctor. But by and large, contacts work for almost anyone.
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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.
Why Are My Contacts Stronger Than My Glasses
Since eyeglasses are usually about 12 millimeters from the eye, the prescriptive power of a contact lens which is positioned directly on the tear film of the eye will be slightly less nearsighted. … Therefore, in our example, the power of a contact lens will be less than the eyeglass prescription for the right eye.
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Why Can I Suddenly See Better Without My Glasses
If you think that you are reading better lately without your glasses on, see your optometrist or ophthalmologist. If your near vision is suddenly better than ever, chances are that your distance vision may be worse. Sometimes, when second sight occurs, what is really going on is that you are becoming a bit nearsighted.
Your Contact Lens Prescription
People sometimes ask, “Is my contact lens prescription the same as my glasses prescription?”
The answer is often not obvious, although in the great majority of cases, they are not the same.
Let’s take an example of an eyeglass prescription:
- OD : -4.50 -1.50 x 180
The amount of correction is expressed in diopters, sometimes abbreviated as “D.” Here, the left eye needs a correction of -3.25 diopters. “DS” indicates a spherical correction only, and no astigmatism correction. The minus sign indicates correction for nearsightedness a plus sign would mean farsighted correction .
Here, the right eye has a spherical correction of -4.50D and an astigmatism correction of -1.50D. The degree axis of the astigmatism correction is 180.
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What We Liked About Eyebuydirect
Eyebuydirects collection is huge, which means youll find both a wide range and a lot of variations on similar themes. The search tools let you filter effectively by enough criteria that you can narrow things down quickly.
We really liked the glasses we got from Eyebuydirect, especially given the inexpensive pricing. The fully specd browline pair we ordered compared very favorably to name-brand versions of the same concept from Ray-Ban and others, with solid build, very clear optics and a wide field of vision in the premium progressive prescription we ordered, and the fit was in order with what wed expected from the online fit tools. A pair of basic Wayfarer-style frames we ordered as readers similarly met our expectations, with quality acetate construction and similarly good optical quality to the pricier pair.
Basic single-vision prescriptions are very inexpensive , while pricing for a fully loaded pair, before discounts, runs about $400 for house brands and in the $500 to $600 range for branded options like Ray-Ban. This is still very affordable compared to many brick-and-mortar opticians and high-end retailers, where youd spend in the neighborhood of $1,000 for a similarly specd pair but not far off major discount retailers like Costco.
Two-day delivery is available for a select range of frames, with single-vision prescriptions its about the cheapest way to get a pair of glasses in a hurry. With regular shipping, we got our glasses in nine business days.
Soft Lens Vs Gp Contact Lens Prescriptions
A spherical soft lens does not correct for astigmatism. For someone wearing soft lenses, a toric soft lens would be needed if there is, at minimum, 0.75D of astigmatic correction. Therefore, in our example, the right eye would require either a GP lens or a soft toric lens.
Because the spherical correction for the right eye is 4D or greater, and because toric soft lenses are typically available in 0.25 diopter increments, the contact lens prescription may be closer to -4.25 – 1.25 x 180. The exact prescription can be determined only with diagnostic lens fitting by an eye care professional.
For the left eye, it’s possible that a spherical soft lens with a correction identical to the glasses prescription will work, but again, this determination is best made after a diagnostic fitting.
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What’s The Difference Between A Contact Lens And Glasses Prescription
But, depending on the degree of your refractive error and the type of contacts prescribed, the powers specified on your contact lens prescription may be significantly different than those on your glasses prescription to give you the best vision possible.
Also, a contact lens prescription contains additional specifications that are not included on a glasses prescription, and these can be determined only after a comprehensive contact lens exam and fitting. They include:
You are entitled to a copy of both your glasses and contact lens prescriptions. It is illegal for your doctor to withhold your prescription from you.
You can request a copy of your glasses prescription at the conclusion of your comprehensive eye exam. But a contact lens prescription cannot be written by your eye doctor and given to you until he or she performs a contact lens fitting or has access to your previous prescription and has evaluated the fit of your current lenses.
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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