How To Readmy Prescription
When you leave your eye doctor’s office and look at your prescription, it may seem like an unrecognizable series of numbers and abbreviations. It makes ordering prescription glasses online challenging and overwhelming. Let’s take a moment to decipher and understand whats on your prescription. Let’s get started.
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Converting Bifocals To Single Vision Reading
Familiarize yourself with optical prescription protocol and terms. The Ohio State University Medical Center notes that every prescription is written with an O.D 1. for right eye and O.S. for left eye. Some prescriptions will include numbers under the category of Cylinder and Axis for each eye, but not all. Bifocals will always have a number written under the category of ADD or Addition on a glasses prescription.
Begin with the right eye. All optical processes start with the O.D. first. Add the power of just the Sphere, or distance in the right eye. For example, if the prescription is O.D.Sphere +2.00, Cylinder -0.50, Axis 180 with a reading ADD of -1.00, during conversion you disregard the cylinder and axis until later.
Add +2.00 and the reading ADD of +1.00. The beginning of the reading prescription is now +3.00. Continue with the conversion by adding back in the Cylinder and Axis, so the O.D. is now +3.00 Cylinder -0.50 and Axis 180.
Repeat with the left eye, or O.S. Add the reading prescription power to the left distance power and keep the Cylinder and Axis the same. It is possible to end up with a negative number in the Distance power. If a person’s Distance prescription is written as -4.00 and their ADD is +2.00, his reading power is calculated to -2.00. According to opticianworks.com, the magnifying power or ADD power can be reduced minus power.
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Can You Convert A Glasses Prescription To A Contact Lens Prescription
A common query for contact lens wearers is whether you can convert your glasses prescription into a contact lens prescription. Weve got the answer for you.
Both contact lenses and glasses correct common refractive errors such as myopia , hyperopia , astigmatism which requires toric contact lenses and presbyopia which requires multifocal contact lenses. Although your contact lens and glasses prescription may look similar, it does not mean they will give you the same visual acuity if you try to convert one to the other.
How To Convert Prescription Glasses To Bifocals
Before you convert your prescription glasses into bifocals, youll need to figure out your bifocal lens strength. To get bifocals at the right strength for your prescription glasses, you need the following pieces of information:
- Distance prescription: This is the prescription of your daily glasses.
- Sphere power: The sphere power is the amount of lens power in diopters being used to correct either farsightedness or nearsightedness.
- Add power: The add power is the additional eyesight correction necessary for close reading.
In a lens prescription, prescriptions are written either for the left eye or the right eye . If your vision in one eye is different than your vision in the other, since youll need to order separate bifocal prescriptions for each lens.
The prescription for bifocals that correlate with prescription glasses equals the sphere power of the prescription plus the add power. This will give the prescription for reading glasses, and this, in turn, can allow wearers to choose an appropriate bifocal lens strength.
Note: Keep in mind that if youre unclear which bifocal lens to purchase, an eye doctor or optician can tell you what strength of lens you need for reading glasses based on your current prescription. Its better to get a second opinion from an expert than to accidentally order the wrong lens strength for your bifocals and end up with lenses you cant use.
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Converting Bifocal To Single Vision Distance
Remove the ADD power from the prescription. This is done by rewriting the prescription as a single vision order.
Note on the lab order form next to the bifocal prescription that the order is SVO, which means Single Vision Only or as DVO, for Distance Vision Only. Most labs know to make single vision lenses from a bifocal prescription if the order form includes instructions for DVO.
Mark the lenses as SVO if you are sending a previously worn bifocal pair of lenses to the lab for single vision. Use a permanent marker only if you do not intend to re-use your bifocal lenses in the future. Simply make an “X” on the bifocal portion of the lens or write “SVO” across each lens to alert the lab that the new lenses will be made into single vision.
Sometimes, specific situations are taken into consideration when converting a bifocal prescription to reading or single glasses. If your work is at armâs length or extremely close, the power of the lenses may be adjusted. Experienced licensed opticians and eye care professionals will usually help convert a prescription for little or no charge.
Prescriptions for glasses may not have any numbers written under Cylinder and Axis or just have the numbers written for one eye. Cylinder and Axis reflect astigmatic correction, and many people do not have the correction or only have astigmatism in one eye.
Find Your Reading Glasses Power
Are you asking yourself what strength reading glasses do I need?. It happens to everyone â fine text becomes blurry and you find yourself holding menus farther and farther away to be able to see. You, like millions of others, are likely developing presbyopia and need reading glasses. If youre hesitant about whether or not you should start wearing readers, here are a few other reading glasses indicators that might convince you.
Weve made it easy to figure out your reading magnification, also referred to as your reading power, if youre new to reading glasses and arent sure where to start.
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Converting Glasses To Bifocals Is Easy
Eyeglass prescriptions may seem complicated, but the process of converting your prescription for reading bifocals is as easy as some simple arithmetic. With the easy convenience of flexible stick-on bifocal lenses, anybody can incorporate bifocal technology into their existing pair of prescription glasses.
This Is How To Convert Prescription Glasses To Bifocals
If you have prescription glasses but also require glasses for close reading, bifocals can be one way to incorporate both functions in the same pair.
People who need bifocals and prescription glasses dont need to carry two different pairs of glasses to achieve comfortable vision. Read on to learn more about how to convert your prescription glasses to bifocals without having to buy a new pair.
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Placing The Bifocal Lenses
The bifocal lenses should be placed centric under your pupils within a 2,5mm offset in your nasal direction. The height of the bifocal sticker should match the level of your lower eyelid. To ensure proper distance, use a ruler or measuring tape to measure the inches out before placing the bifocal lenses on the interior of the prescription lenses.
Place the bifocal lenses with the curved side facing down towards the curved side of the prescription lens, lining the bottom of the bifocal lens up with the bottom edge of the prescription lens. Pressing the lenses firmly against the prescription lenses should attach them.
How To Convert Bifocals To Single Vision
Around the age of 40, most people begin to notice fine print is more difficult to read, according to the University of Michigan’s Kellogg Eye Center 2. Bifocals are lenses that have two types of vision correction, also called power: one for distance and another for helping to see better up close. A bifocal prescription is converted to single vision lenses by either combining the powers into a reading lens or removing the reading part of the prescription for single vision distance lenses.
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Make Sure Your Prescription Is Up To Date Before Buying Reading Glasses
If you havent had an eye exam in over a year, and are thinking of purchasing reading glasses, you should see your optometrist first. Depending on your age and medical background, your eyes and vision may be changing rapidly, and you may need an updated prescription even after a year.
In fact, experts recommend that children under 14 and diabetics of any age should have an eye exam twice per year because their eyes are changing rapidly.
Children from 15 to 18 need to have their eyes examined once per year as do seniors over 65. All other adults from 19 to 64 should have eye exams at least every 2 years to assess their eye health conditions.
Accounting For Differences Between Eyes
At this point you should have 1 number for each eye which represents the most ideal strength for over-the-counter reading glasses.
If those two numbers are the same, you are in luck and you can skip to the section entitled Adjusting the Strength of Reading Glasses for Your Working Distance.
However, if the numbers are different, unfortunately some compromise will have to be made. As youve most likely noticed when shopping for over-the-counter reading glasses, the number for the right and left eye are always the same.
If the strength needed for your right and left eyes are different, which one do you choose?
If the difference between your right and left eyes number is only 0.25, choosing one or the other typically doesnt make much difference.
If the difference between your right and left eyes number is 0.50, splitting the difference usually works.
If the difference between your right and left eyes number is 0.75 or more, over-the-counter reading glasses may not be the best option for you. To try to make it work, start with the number for your dominant eye, and try every step between that number and the number of your non-dominant eye and look for the one that provides the best visual comfort.
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How To Read Your Eye Prescription
Youve gone to the optometrist, had your eye exam, and now its time to get your prescription. When you look at it, though, youre perplexedwhat do all these letters and numbers mean? How do they tell you what kind of glasses you should get?
Not to worry. Eye prescriptions can be confusing, but well explain all of their different parts so you know how to read one. Not only will it help you understand your eyewear better, it also makes for an extremely practical party trick.
How To Read Your Eyeglass Prescription
When you look at your prescription for eyeglasses, you will see numbers listed under the headings of OS and OD. They are Latin abbreviations: OS means the left eye and OD means the right eye. Occasionally, you will see a notation for OU, which means something involving both eyes. In general, the further away from zero the number on your prescription, the worse your eyesight and the more vision correction you need. A plus sign in front of the number means you are farsighted, and a minus sign means you are nearsighted. These numbers represent diopters, the unit used to measure the correction, or focusing power, of the lens your eye requires. Diopter is often abbreviated “D.”
For example, if your prescription says -1.00, you have one diopter of nearsightedness. This is a fairly mild amount of nearsightedness. If you are -4.25, that means you have 4 and 1/4 diopters of nearsightedness. This is more nearsighted than -1.00, and requires stronger lenses. Similarly, +1.00 would be a small amount of farsightedness and +5 would be more.
For people who have astigmatism, there will be three numbers in your prescription. The general form for writing these numbers is S x C x Axis
The S refers to the “spherical” portion of the prescription, which is the degree of nearsightedness or farsightedness discussed above.
-2.00 +1.50 x 180
+3.50 +3.00 x 45
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Can You Turn Regular Prescription Sunglasses Into Sunglasses
Do you require to convert your prescription glasses into sunglasses to get the benefits of both?
You can convert your regular glasses into sunglasses by buying that can work both as clear regular glasses in indoor lights and easily transform into sunglasses in the glare of the sun outside.
Another option is to get tinted lenses for your prescription glasses with any color of your choice. Take your prescription glasses to the optical store and get your lenses tinted. But this tint is permanent and you will not get the clear lenses again. So, you have to buy another pair of glasses to have a clear vision for indoor activities
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.
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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.
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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Calculating The Strength Of Your Reading Prescription
What were doing here is using the information provided on your prescription to determine the strength of your reading prescription.
It is common to mistake the number in the ADD column as what the strength of your reading glasses should be, but for the vast majority of people, it is not. In fact, for most people its not even close and will make your vision a lot worse!
In order to find the correct strength of your reading glasses, you have to add the ADD number and the SPHERE number together for each eye.
Note: Be very careful about the signs! The SPHERE number will either have + or sign in front of it. The ADD number will always have a + sign in front of it. When adding the two together, make sure you are comfortable with adding positive and negative numbers together if its necessary.
In this example prescription, the calculations would look like this.
We got to these numbers by adding the ADD number to the SPHERE number for each eye and keeping the CYLINDER and AXIS the same. The calculations went as follows:
For the right eye: +2.50 + = -2.00
For the left eye: +2.50 + = +1.50
If you still have questions about this part, feel free to ask me in the comments section of this article.
Reading Your Eyeglass Prescription: How To Crack The Code
Do you feel like you need special code-cracking skills when trying to decipher the information on your eyeglass prescription? Most people understand the basics of 20/20 vision. But it can be mind-boggling to comprehend the details of your eyeglass prescription and how it affects the way your eyeglasses are designed to help you achieve the desired 20/20 vision.
Today, we are breaking down the basics giving you the key to unlocking this information. Heres what you need to know as you are reviewing your prescription details:
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Confidently Converting Your Eyeglass Prescription To Reading Glasses
Therefore, we encourage you to try it out for yourself today. If it would make you feel more comfortable, feel free to do some hypothetical conversions first. Completing practice conversions before real-life conversions will make you more comfortable with the math and will give you the confidence to move forward. Once you are more confident, however, feel free to try the conversion on yourself. If you accurately complete the conversion, thats great! If not, you will quickly notice, and you can course-correct as necessary.
We wish you the best of luck!
How To Apply A Bifocal Lens To Prescription Glasses
The application of a flexible bifocal lens to prescription glasses is one of the easiest things about the conversion. These lenses dont require any kind of adhesive to attach to prescription glasses, which makes them a good option that doesnt risk your glasses. You cant accidentally glue them in the wrong spot or anything like that.
Before adding flexible bifocal lenses to your prescription glasses, its important to make sure that your glasses are well cleaned first. Clean lenses thoroughly with hot water and soap or with lens cleaning pads to ensure that there is no debris or oil from your hands present on the surface of the lenses. If debris or oil is present on the surface when you place the bifocals, it can keep them from sticking.
After the lenses are cleaned, allow some water to pool on the convex surface of the interior of the lenses, resting them gently face-down to prevent the outside of the lenses from being scratched on the table surface.
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