Orthokeratology Or Corneal Refractive Therapy
This treatment involves wearing a rigid contact lens overnight to help reshape the cornea. It is a temporary measure to improve vision across the following day without further help from lenses or eyeglasses. It is suitable for people with astigmatism. All benefits, however, are reversible if the user stops wearing the lenses at night.
What Is The Difference Between Progressive Bifocal And Single Vision Glasses
The differences between each type of glasses are not 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.
1. 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 near, and the other on the upper part includes a distance prescription.
3. Progressive lenses: multifocal lenses offer multiple corrections in one pair. These prescriptions have a no-line lens and offer intermediate distance vision, which can be adapted for certain specific uses, such as computer work.
Scleral Contact Lenses & Dry Eye
Dry eye is an increasingly common eye condition that causes your eyes to feel irritated and uncomfortable. If left untreated, dry eye can become so severe that simple tasks like driving become impossible.
Your eyes should produce good quality tears as necessary to keep your eyes lubricated. When your eyes are not making enough tears or the tears they make are low quality, dry eye symptoms can occur.
Scleral contact lenses are designed to cover your sclera rather than resting on your cornea. These lenses leave a small space between the lens and your cornea that acts as a fluid reservoir to trap moisture against the eye and keep it hydrated throughout the day.
Wearing scleral lenses is different from traditional contact lenses. Your optometrist will help you choose the best scleral lens for your eye and show you how to use the lenses properly. Theyll also be able to give you care instructions for your lenses for the best possible outcome.
You can wear your scleral lenses for up to 12 to 14 hours a day and these lenses typically last 1 to 2 years . Scleral lenses are generally custom-made for your eyes, so you will likely need to go for a fitting appointment before you get your lenses.
These lenses are also a great option for people who have corneal irregularities, such as keratoconus, as it simulates a smooth ocular surface and improves vision.
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Contact Lens Vs Eyeglass Prescriptions: Whats The Difference
June 14, 2021 by Michael I. Davis, O.D.
Many people think that prescriptions for eyeglasses and contact lenses are the same and that they can be used interchangeably. After all, they both help correct your vision and help you see better, right? Unfortunately, this is not the case. If you want to wear both contact lenses and eyeglasses, you will need a separate prescription for each. Heres why.
What Should You Expect During A Contact Lens Exam
This exam includes a discussion about your overall lifestyle and an eye assessment. Your eye doctor will assess the curvature of your cornea to ensure your new lenses fit comfortably. Your pupil size helps determine your lens size.
If youre looking for a glasses or contact lens prescription, your optometrist can help you. They can assess your overall eye health and vision and determine the most effective options.
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Glasses Prescription Vs Contact Lens Prescription
Glasses prescriptionContact lens prescription
Note: The glasses prescription and the contact lens prescription above are just samples. Yours may differ but should contain the same information.
Note: not everything shown on the above table will necessarily be included on your prescription. The above is just an example of what could be found on your prescription and what will not be found on your prescription depending on whether you wear contact lenses or glasses.
Special Features On My Prescription
You may also find additional information on your glasses prescription such as the suggestion of certain 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 . Occasionally, youll see a specific brand of progressive or single vision lens written on the prescription itself. This is most often a recommendation based on a brand the doctors office carries. If you have questions about anything on your prescription, feel free to give a call to our customer service team.
2. Vision enhancement: a special treatment for one or both lenses used to improve vision and clarity through your glasses. You could find different options such as:
a. Anti-reflective coating: enhances clarity and concentration by allowing more light to come in and reduces reflection.
b. UV protection: to prevent your eyes from being damaged by the suns UVs, your lenses can come with special anti-UV treatment.
c. Transitions: these lenses are equipped with a technology that adjusts your glasses tint according to the light. When the sun comes up, your glasses 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 can be adjusted on top of your prescription glasses. They can be polarized and come in various formats..
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Contact Lens Prescriptions Vs Glasses Prescription
So, what are the major differences between the measurements used in contact lens prescriptions and those of prescription glasses? While there is some overlap between what is measured in prescriptions for glasses and contact lenses, glasses prescriptions take into consideration a series of factors that contact lenses do not.
Prescriptions for glasses take into account additional measurements due to the position of the lenses of the glasses in relation to the eye, and the difference in the size of the lenses. For example, one important distinction is the measure of the distance between the pupils , taken during the eye exam. This measurement is taken in order to configure the shape of the lenses so that the refraction of the light and vision correction as precise as possible.
Of course, there are also things that are common between both kinds of prescriptions. Sphere, or power, measurements, which measure the level of strength needed to correct your vision, is measured for both prescriptions. However, the power measurements may vary significantly depending on the level of refractive error and the type of contacts that you are prescribed.
For people with astigmatism, both their glasses and contact lens prescriptions will account for cylinder and axis measurements in addition to the power of correction, in order to account for the irregular shape of the cornea or lens of the eye.
Your Two Different Prescriptions
Many people assume that since contacts and glasses perform the same function for your eyes, their prescriptions for both would be the same. After all, your eyes dont change when you pop in contacts as opposed to when you put on glasses, so why would the prescriptions be different?
However, contacts and glasses prescriptions are actually slightly different because of their distance from your eyes. Eyeglass lenses are placed approximately 12 millimeters away from your eyes, while contact lenses sit directly on your corneas. 12 millimeters might seem like a negligible distance, but thats enough space to create a difference in prescription strength. For instance, if you tried to use your glasses prescription for your contacts, it would likely be too weak.
Plus, since contact lenses must be made to fit your eyes precisely, contact lens prescriptions come with additional specifications that glasses prescriptions dont have. The most important factors are:
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Are There Different Types Of Contact Lenses Which One Is Right For Me
There are different types of contact lenses available for different prescriptions. Your optician will choose the correct type of lenses for your prescription to prevent damage to your eyes.
For example, many people who wear glasses are not aware that they have astigmatism, a condition in which the irregular curvature of the eye causes blurred vision. Glasses correct astigmatism with lenses that are held firmly in place by the frame. However, contact lenses can rotate in the eye since they float on a thin film of tears. Thats why people with astigmatism need a special type of contact lenses called toric lenses to correct this condition. Toric contact lenses are designed for rotational stability to ensure they remain correctly oriented in the eye. An optician will flag this during your consultation and prescribe the correct type of lenses for you.
Can A Glasses Prescription Be Converted To Contacts
Are wearing glasses nowadays? But now youre fed up with this look and want to change it.
Dont know what to do.
Is it possible to convert your glasses prescription into contacts?
We have a short answer to all your queries.
No, you cant do that directly as there are many specific terms in glasses that couldnt be converted into contacts. You have to get your new prescription from a professional.
Similarly, it is not possible to convert contacts prescriptions into glasses. Both require a separate description. No doubt, some refractive errors are the same in glasses and contacts like shortsightedness and farsightedness, but it doesnt mean they are the same.
Not everyone can wear contact lenses as some have a weak and sensitive cornea that is not suitable for lenses. If you try to wear lenses in this case, you may damage your eyes or get irritated.
So, without consulting your doctor, dont get lenses because he will recommend you if glasses are best for your eyes or you have to get lenses.
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What Do The Numbers On My Prescription Mean
Your prescription may include the following: SPH, CYL, Axis, ADD and Pupillary Distance .
The first four parameters have to do with your visual correction. PD is a crucial measurement we need to make your glasses.
Heres the meaning behind each of these letters and numbers on your glasses prescription:
1. OD oculus dexter indicates your right eyes parameters.
2. OS oculus sinister shows your left eyes parameters.
4. CYL & AXIS: a Cylinder and Axis number are required to correct Astigmatism. Both parameters will be required together.
5. ADD: provides magnifying power for reading, bifocal, multifocal and progressive lenses. You will most likely have the same number for both eyes that usually ranges between +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 as our SightRelax lenses.
There is a separate prescription for your right eye and your left eye. Most of the time, OD and OS are indicated on the left of your prescription and the following numbers show each eyes specific needs. Some glasses prescriptions also include additional numbers such as:
6. Prism: measured in prismatic diopter . It is required when eye alignment needs assistance. It is indicated as follows:
Pros And Cons Of Contact Lenses
The American Academy of Ophthalmology advises that contact lens wearers consider switching to eyeglasses during the coronavirus pandemic. Although there is no evidence that they are more at risk of developing the disease, contact lens wearers tend to touch their eyes more frequently. The novel coronavirus can spread through the eyes, so protecting them with glasses may help prevent infection.
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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.
Can You Use Your Contact Prescription For Eyeglasses
Your eye doctor will often apply the same prescription you use for contact lenses for your eyeglasses. There may be minor changes, but in general, your prescription will remain the same no matter your choice in corrective eyewear.
We suggest seeing your eye doctor once per year for a comprehensive eye exam. That will ensure your prescription stays up to date so that you can enjoy the best eyesight. An annual exam will also help your optometrist to test your eyes for any changes in vision.
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How To Read A Contact Lens Prescription For Astigmatism
CYL: CYL stands for cylinder. If you have astigmatism, youll need a cylindrical rather than a spherical lens. Thats just a technical way of saying that the lens will correct your vision differently in different areas of the eye. The cylinder portion of your contact prescription is measured in diopters and represents the severity of your astigmatism. It can be a positive or negative number.
AXIS: Axis is measured in degrees and always accompanies the cylinder measurement on a contact prescription. The axis tells you where your astigmatism is located and how its oriented on your eye. Its always between 0 and 180 degrees.
Why Are Glasses And Contact Lens Prescriptions Different
Prescriptions for glasses and contact lenses are different because of their different shapes and functions.
Glasses sit in front of your face and do not make direct contact with your eye. While wearing glasses that are not made to fit your prescription is not recommended, doing so will not harm your eyes.
Contacts are used in a completely different way. Instead of sitting in front of your eyes, they sit directly on the surface of your cornea. This means that each pair must be made to fit the exact eye size and shape of the person they are intended for.
If your contacts do not fit your eyes properly, they will not stay in place while you are wearing them. Not only will this make it difficult to see, but it will also put you at risk of eye infections and injuries.
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Prescription Eyeglasses And Contact Lens Prescriptions: Faq
Lets start with some of our most frequently asked questions about glasses and contact lens prescriptions. Follow our guide to find the answers on how to read glasses prescriptions:
The following tips will help you decipher and understand your eyewear prescriptions. If you get stuck, get in touch with our Customer Service team. Well be happy to contact your Eye Care Provider to verify your prescription for you.
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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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.