How to read the prescription for your glasses

Global Courant

Learning what all those signs and symbols mean is crucial to taking control of your visual health.

So let’s start with a very brief explanation of what the abbreviations on your prescription really mean:

OD is oculus agile what your means right eye

Operating system is oculus sinister what your means left eye

SPH is area – most of your prescription. It lists the strength of your prescription in dioptres.

CYL is cylinder – indicates the strength of your astigmatism (if you have one).

ASH is the rotation of the cylindrical lens (CYL) running on a plane of 1-180 degrees.

PL is flat – which means no vision correction is needed (basically you want frames with clear glass lenses for fashion purposes).

DV resources remote view

NV resources close view – sometimes it says NVO

ADD is an abbreviation for added value

PD is the distance between your pupils or student distance

OU simply means both eyes

FRIEND means multifocal additive lens and it is the added value for your progressive lenses.

Balance means one eye has a prescription and the other eye has no usable vision.

X is an abbreviation for Ash.

Prism happens when both eyes are misaligned and they need a prism to realign them.

base is the rotation of the prism. The recipe will read:

BO – base out

BI – basic

BU – base on

BD – base down

Every doctor writes their prescription differently, so you really need to write down the abbreviations and work out the meaning accordingly.

Remark: the numerical values ​​are always written with a plus sign (+) or a minus sign (-) in the SPH, as well as in the CYL and ADD. These signs are probably the most crucial of the whole recipe, because mixing them up will determine how and if you can see at all.

As mentioned above, SPHERE (SPH) is the strength of your prescription in 0.25 increments. Nearsighted people (problems with distance vision) usually have a minus sign (-) in their bulb, while farsighted people (problems with near vision) have a plus sign (+) in their prescription.

Your optometrist or ophthalmologist may also have written your SPH or CYL as +150, which equals +1.50.

For those with an ASTIGMATISM, you will have a note on your prescription for your CYLINDER (CYL). Basically, this is when your eye is curved and that curvature makes your vision blurry unless corrected. Some people only have astigmatism in one eye, and many people have none at all. In that case, that field is left blank. Alternatively, they write SPH, 00, Plano or DS – all meaning you don’t have astigmatism.

If you do have a CYL, then you also have an AXIS, which tells you to what extent that CYL lens needs to be manufactured. The axis must be from 1-180 degrees and will always be an integer. If your axis is written as “6”, it can be entered as 06 or 006.

The ADDITIONAL VALUE (ADD) is most commonly used for both progressive and single vision reading glasses. You should look closely at these numbers, as your doctor may write them in the near vision (NV) or ADD sections, or just mark them on the side as the ADD. There are times when your doctor only writes the ADD once, meaning it’s for both eyes, while other times (and more correctly) each eye gets its own value. Single distance goggles do not require ADD reading and this can simply be left out on your order form, although it is recommended for better vision. They needed special glasses, such as reading, progressive or bifocal glassesMUST include this information to avoid manufacturing defects.

Your pupillary distance (PD) isn’t often on your prescription, so you should always check it before you leave your doctor’s office. The average PD is 62mm and most people fall in the 54mm to 74mm range. Measuring your own PD is tricky and should be done by a professional. It is never wise to guess, otherwise the optical center of the glasses will not match your pupils, you will get a headache and you will not feel comfortable.

Your PD can be written in different ways, namely: 63; 32/32; 33/31; 30.5/33.5; 63/60.

If your PD is written as 63 – just enter it as 63. If your PD is written as 32/32 you can add the two together and insert 64 or you can write each number separately. If your PD is written as 33/31 or 30.5/33.5, the measurements from the center of your nose to the pupil of both eyes are not equal and you must insert your PD as described on your prescription. Do not add the numbers together.

Don’t forget, with all this said and done, most reputable online eyewear companies will also allow you to email or fax your prescription to them so they can double check that everything is correct OR so they can just do it for you can fill in.

How to read the prescription for your glasses

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