How to Read a Contact Prescription Box
Updated on Feb eleven, 2021. Reviewed by Chris Day (Optician) andDr. Justin Asgarpour (Optometrist).
Looking for an easy explanation on how to read your spectacles or contact lens prescription? Y'all're in the right place.
We'll assistance you understand what your eye care professional person ways by all those numbers and letters on your prescription, then you can enter these details with confidence when you lot shop for eyewear online.
There'southward one key affair to recollect virtually glasses and contact lens prescriptions: the measurements are unlike.
A spectacles prescription is intended for the buy of glasses merely – it does not include data that is required in a contact lens prescription. If you habiliment contacts, you'll need a prescription specifically for contacts. (More than on that later)
Read on to acquire everything you need to know well-nigh how to read spectacles and contact lens prescriptions before shopping for eyewear.
Prescription eyeglasses and contact lens prescriptions: FAQ
Permit's start with some of our most frequently asked questions near glasses and contact lens prescriptions. Follow our guide to find the answers on how to read spectacles prescriptions:
- What do the numbers on my prescription mean?
- How do I read my glasses prescription?
- What is the deviation between progressive, bifocal and single vision glasses?
- How practise I read contact lens prescription?
- What are the key differences between a glasses and contact lens prescription?
The following tips will help you decipher and understand your eyewear prescriptions. If yous go stuck, get in touch with our Customer Service team. We'll be happy to contact your Eye Care Provider to verify your prescription for you.
What do the numbers on my prescription mean?
Your prescription may include the following: SPH, CYL, Axis, Add and Pupillary Distance (PD). 
The kickoff 4 parameters have to do with your visual correction. PD is a crucial measurement nosotros need to brand your glasses.
Hither'southward the meaning backside each of these letters and numbers on your spectacles prescription:
one. OD "oculus dexter" indicates your right middle's parameters.
two. OS "oculus sinister" shows your left eye's parameters.
3. SPH "sphere" indicates the corporeality of lens power prescribed for nearsighted or farsighted vision. Information technology is measured in diopter and uses (+) for farsightedness (hyperopia) and (-) for nearsightedness (myopia).
four. CYL & Centrality: a Cylinder (CYL) and Axis number (between 0 and 180 degrees) are required to correct Astigmatism. Both parameters will be required together.
5. ADD: provides magnifying ability for reading, bifocal, multifocal and progressive lenses. You will most likely have the same number for both eyes that usually ranges betwixt +0.75 and +3.00. Occasionally, lower add powers than +0.75 can be found on a prescription. These are for Anti-Fatigue lenses such equally our SightRelax lenses.
In that location is a separate prescription for your right middle and your left middle. Nigh of the fourth dimension, OD and OS are indicated on the left of your prescription and the post-obit numbers show each centre'southward specific needs. Some glasses prescriptions also include additional numbers such every bit:
half-dozen. Prism: measured in prismatic diopter (p.d.). It is required when eye alignment needs assistance. It is indicated as follows:
-
- BO (base of operations out)
- BU (base upwardly)
- BI (base in)
- BD (Base-down)
Each one of these indicators provide information about the base management or the thickest edge of the prism. Clearly does not offer prism prescription glasses.
In improver to the full general parameters, eyeglass prescriptions tin can require a Pupillary Distance (PD). Your PD is the distance between the centre of one pupil (the central black dot of your center) to the centre of the other pupil. It is measured in millimetres and is an important part of your prescription.
PD indicates where the optical centre of your lenses should be placed, and then you can have the best, most comfortable vision. It is generally mentioned in your eyeglasses' prescription with the letters 'PD'. If you can't run across it, y'all tin can acquire how to mensurate your pupillary distance.
How do I read my glasses prescription?
Once you empathize the sections of your spectacles prescription, you'll be able to effigy out what all those numbers hateful.
If y'all see a – , it indicates nearsightedness. If y'all encounter a +, it indicated farsightedness. If you observe an 'Add' power, information technology means yous require magnifying lenses, such as progressives.
When you're ownership glasses online, all you need to exercise is make sure the numbers on your prescription match the numbers in the prescription field on your screen.
In the sample below, the right eye is prescribed -2.50 sphere to right nearsighted vision. This eye needs a cylinder of -0.75 and an axis of 173 to correct astigmatism, and an Add ability of +2.25 to correct near vision. The ADD value is usually present in a multifocal prescription.
The left center is prescribed with a sphere of -three.00 to correct nearsighted. This eye needs a cylinder of -1.00 and 004 to correct astigmatism, and an Add together power of +ii.25 to correct virtually vision. Without the Add together value, information technology is a unmarried vision prescription.
This is the right way to include the numbers on our website for spectacles:
What is the difference between progressive, bifocal and single vision glasses?
The differences between each type of spectacles are non always clear. To understand how to correctly read a prescriptions for glasses, here is an overview of the main categories of lenses that can be written on your prescription.
one. Single vision lenses: a large majority of glasses come with single vision correction. This common type of lens is generally used to correct nearsightedness, farsightedness or used as reading glasses.
2. Bifocal lenses: these glasses come with two vision corrections. One is on the lower part of the lens to help you read or see from virtually, and the other on the upper part includes a distance prescription.
three. Progressive lenses: multifocal lenses offer multiple corrections in 1 pair. These prescriptions have a no-line lens and offer intermediate distance vision, which tin can exist adapted for certain specific uses, such as figurer work.
Special features on my prescription
You lot may also find additional information on your glasses prescription such as the proffer of sure types of lens coating and special comments from your optometrist.
1. Lens designs on a prescription indicate your eyesight requirement, detailing the lens' design and function (single, progressive, bifocals…). Occasionally, you lot'll see a specific make of progressive or single vision lens written on the prescription itself. This is most frequently a recommendation based on a brand the dr.'s part carries. If you lot have questions about annihilation on your prescription, feel free to requite a phone call to our customer service squad.
2. Vision enhancement: a special treatment for one or both lenses used to improve vision and clarity through your glasses. You could detect dissimilar options such as:
a. Anti-reflective coating: enhances clarity and concentration by assuasive more than light to come up in and reduces reflection.
b. UV protection: to preclude your optics from being damaged by the dominicus'southward UVs, your lenses tin come with special anti-UV handling.
c. Transitions: these lenses are equipped with a applied science that adjusts your spectacles' tint according to the lite. When the sun comes upwards, your spectacles turn into sunglasses!
d. Polarized: improved glass technology designed to filter and reduce glare. Polarized lenses offer more clarity and a sharper vision to their wearers.
e. Clip-on glasses: additional lenses that tin can be adjusted on pinnacle of your prescription spectacles. They can be polarized and come in various formats..
f. Bluish light blocking glasses: a special coating that protects your eyes from artificial calorie-free by reflecting bluish lights that come from digital devices. Clearly's blue low-cal glasses are too scratch-resistant and anti-glare to offer y'all articulate and precipitous vision.
Recollect: spectacles and contact lens prescriptions are unlike.
If you desire to purchase contact lenses, you lot'll need a specific prescription from your eye care professional person. In add-on to the full general parameters that we've mentioned, a contact lens prescription will include a Base Bend and a Bore.
The differences: Base curve (BC) and diameter (DIA)
If you lot're non sure whether yous have an eyeglass or contact lens prescription, verify whether your prescription includes:
1. Base of operations Curve (BC): the number that indicates your contact lens' shape. According to the steepness or flatness of your cornea, your prescription indicates how large your contact lens should be.
2. Bore (DIA): a number indicating your contacts' length to brand sure they'll cover your cornea properly.
iii. Make: your centre md will determine the advisable make and type of contact lenses for you, according to your preferences and specific requirements.
4. Expiration appointment: your eye care professional will determine an expiry date for your prescription. Past that appointment, you'll require a new prescription for contact lenses. These are more often than not set up annually.
5. Corrective power: these are the numbers associated with the bodily power needed in your lenses. These numbers often alter (or disappear) betwixt your glasses prescription and your contact lens prescription, especially with higher powers.
If y'all notice the information displayed in a higher place on your prescription, you have a contact lens prescription.
Both the Base Curve (BC) and Bore (DIA) of a contact lens ensures a proper fit on your cornea and total heart surface. Those features ensure comfort and encourage centre health, including allowing proper oxygen to the middle. You'll also need this data if you lot want to order contact lenses online.
Do y'all have a valid middle prescription and are ready to store?
At present that y'all sympathize how your eye prescription works, you tin larn how to purchase glasses online at Clearly.
Pick a pair of frames online and enter your prescription details. You'll soon be rocking a pair of spectacles that wait great and brand everything around you look nifty as well. Click to browse our drove of stylish and affordable glasses.
Fancy getting contact lens delivered directly to your door? Click to bank check out our wide selection of contact lenses.
Have more questions? Nosotros have diverse other ways to help yous read your centre prescription. Contact u.s. past email, live chat or telephone.
Source: https://www.clearly.ca/thelook/how-to-read-glasses-contact-lens-prescriptions/
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