How to Upload Contact Prescription to Walmart
In this article, you lot volition learn how to convert your spectacles prescription to contact lenses. At that place are a few exceptions y'all need to keep in heed when doing the conversation. The easiest way to convert your glasses prescription into your contact lens prescription is to use a conversion canvas I listed at the finish of this article.
In this sheet, you will notice three columns. The eye shows the spectacle ability. This spectacle power is the same equally the lens power on your prescription under the acronym SPH for the correct and the left middle. When the lens power is negative you demand to check what the needed prescription will be on the left of the conversion sheet.
In this case, you lot would be shortsighted. When y'all are farsighted and the lens power in your prescription is positive y'all need to await in the right function 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 altitude in such a case is 12mm betwixt 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 notice below.
When you want to apply this formula you need to measure the distance betwixt your eyes and your spectacles. The unit for the distance needs to be filled in every bit meters. And so before you are lost with this formula I will guide y'all through the process with an example. Let us assume you look at the prescription of your spectacles and you are farsighted with a needed lens power of 5.25 diopters.
Then a person adjacent to y'all need to place a ruler on the temple of your glasses and needs to measure the distance from your glasses to the back surface of the lens in your glasses. After you can fill in the data in the formula and what you will summate looks like this.
Now you successfully converted the glasses prescription to the needed contact lens prescription. Simply when you endeavor to order a contact lens with 5.5029 diopters you will non discover this options because in most cases the options are rounded to aquatic of a diopter. In virtually cases the converted prescription needs to be rounded up or downwards.
When you are farsighted which means you take a positive lens power in your spectacles y'all should round downward. Only when you lot are shortsighted it might exist better to circular upwardly and go for the stronger lens ability. The reason for this is pretty simple your eyes are able to compensate for a slightly college lens ability easily when you are shortsighted just when the contact lens is slightly besides weak in its lens power the distance volition go blurry and your eyes can not recoup for that.
When you are farsighted your eyes can fairly hands compensate for a lens ability that is slightly too weak merely when the lens is slightly too high the distance will become blurry. The first few paragraphs focused on converting the SPH value in your prescription exclusively. Notwithstanding, most people will have a correction for their astigmatism in their glasses prescription. It tin be found nether the acronym called CYL which stands for the cylinder.
The aforementioned formula as shown for the SPH applies to the CYL value. However, the CYL value e'er gets combined with the A in your prescription which shows where the CYL(lens power) needs to be positioned to correct your astigmatism. While this tin can be problematic when converting your spectacles prescription to contact lenses will exist discussed in the next paragraphs.
When Converting Your Glasses Prescription to Your Contact Lenses Could Crusade Issues
When you lot calculated the correct lens powers then the value CYL and A for Axis need to be called in order to be able to order contact lenses. The problem is in virtually cases those values besides need to exist rounded down or upwardly. Presumably to the option side by side to the prescription. What I mean by this will become clearer when you lot have a closer look at the example below.
In improver to the first conversion example, we at present take the CYL value and the A for the centrality here. But in most cases depending on the contact lenses, you would cull the CYL value will be available in -one.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 lot made no fault during the conversion. When you await at the axis the perfect value will 7 degrees in which the contact lens should correct your vision. But in virtually cases only ten and 0° (or 180°) (Which is the same in regards of the axis is available) will be an option. Become for the number which is closest to the bodily prescribed axis.
Now hither comes the tricky part. When the contact lens arrives only an eye care professional tin see if the lens is stabilized in the optimal position. It is 1 matter to perform the conversion and round the values up and down but when rotation comes into play you lot 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 zilch to do with the 0°, 7°, or ten°.
This is why I strongly advise you to simply let an optician or optometrist perform the fitting of contact lenses. Not merely will y'all benefit wellness wise in the long rung when you lot get your check ups regularly simply yous will also avoid other short term problems like unstable vision or headaches.
Conversion Sail
| Contact Lens Power if Glasses Ability is Negative | Spectacle Ability (Plus or Minus) | Contact Lens Power if Glasses Power is Positive |
| -3.75 | 4.00 | +iv.25 |
| -4.00 | 4.25 | +iv.50 |
| -4.25 | four.50 | +4.75 |
| -4.fifty | iv.75 | +v.00 |
| -4.75 | 5.00 | +5.25 |
| -5.00 | 5.25 | +five.50 |
| -5.25 | five.fifty | +5.75 |
| -5.l | 5.75 | +6.00 |
| -5.75 | 6.00 | +6.l |
| -5.75 | 6.25 | +6.75 |
| -half-dozen.00 | vi.50 | +7.00 |
| -6.25 | half dozen.75 | +7.25 |
| -vi.l | 7.00 | +7.l |
| -6.75 | seven.25 | +8.00 |
| -7.00 | 7.50 | +eight.25 |
| -vii,25 | seven.75 | +8.50 |
| -7,25 | viii.00 | +8.75 |
| -7.50 | 8.25 | +ix.00 |
| -7.75 | viii.50 | +9.fifty |
| -viii.00 | eight.75 | +nine.75 |
| -8.25 | 9.00 | +10.00 |
| -8.50 | 9.25 | +10.25 |
| -8.50 | nine.l | +ten.75 |
| -viii.75 | 9.75 | +xi.00 |
| -9.00 | 10.00 | +xi.25 |
| -nine.fifty | ten.50 | +12.00 |
| -9.75 | xi.00 | +12.75 |
| -x.00 | 11.50 | +xiii.25 |
| -10.fifty | 12.00 | +14.00 |
| -11.00 | 12.50 | +14.75 |
| -11.25 | thirteen.00 | +15.50 |
| -eleven.75 | 13.fifty | +16.00 |
| -12.00 | 14.00 | +sixteen.75 |
| -12.l | 14.50 | +17.50 |
| -12.75 | xv.00 | +18.25 |
| -thirteen.00 | 15.50 | +19.00 |
| -13.50 | sixteen.00 | +xix.75 |
| -thirteen.75 | 16.50 | +20.fifty |
| -14.25 | 17.00 | +21.50 |
| -xiv.50 | 17.l | +22.25 |
| -fourteen.75 | 18.00 | +23.00 |
| -15.25 | 18.50 | +23.75 |
| -15.l | 19.00 | +24.75 |
| -xvi.00 | xix.50 | +25.fifty |
| -xvi.25 | 20.00 | +26.25 |
Is a Contact Lens Prescription the Same For Glasses?
In near cases a contact lens prescription is non the same equally for glasses. The reason is the reduced distance (vertex distance) betwixt the contacts and the optics compared to glasses. When the contact lens prescription is lower than four diopters in lens power it is more likely to be the same. However when contact lenses take a stronger lens power the prescription volition not be the aforementioned.
Determination
Converting the prescription from glasses to contacts is not hard. However, the results need to be looked at during a slit-lamp if the contacts position themselves optimally on the optics. When this does not happen the whole conversion was not successful because the fit needs to be perfect for the conversion to piece of work correctly. When the glasses' ability is lower than iv diopters yous exercise not need to convert the prescription. If the glasses' power is over 4 D then use the conversion chart above or the formula to catechumen the prescription.
This conversion only works for soft contact lenses. With rigid gas permeable lenses other parameters need to be added in order to get a successful conversion which would make this commodity too long.
I wish you lot a great mean solar day.
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Source: https://progressive-glasses.com/how-to-convert-your-glasses-prescription-to-contacts/
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