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Prescription


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What is an optical prescription ?

Put simply it is a mathematical formula from which an optical lens can be crafted so that your vision improves

 


[ Pupillary Distance (PD) ] [ Sphere ] [Cylinder ] [Axis ] [ Prism ] [ Add ]
Intro

As you work through the online ordering system your are presented with a form that asks you to fill in the values for your new prescription glasses.

Even though the form looks complicated, it really is quite straight forward.

  • The form you see on the screen asking for your information is called an RX form or Script.
  • This is the form that the optometrist gives you after they have examined your eyes and the information on the form tells us how to make your glasses for you.

  • Basically all you have to do copy the information from the script into the form on the screen.

  • Sometimes this can be a little difficult because optometrists don't always write the scripts using the same method but at the end of the day they all say the same thing.

  • Below is an outline of what the information means and what is and is not required.


PD Top

Pupillary Distance

The PD or pupillary distance is the distance between the centre of the pupils of each eye.

If this measurement is not on your prescription then the first avenue to obtaining this is to either demand it at the time of having the prescription written or phone and demand it at a later time.

The Optometrist has been paid by you to do this job. You are entitle to the Full prescription.

Measure your PD at home;

You will need a second person to help you measure this distance .

Measure your Right Eye. Try to have both you and the person doing the measuring on the same plane and look directly into the Left eye for the person doing the measuring. Have them measure from the center of the bridge of your nose to the center of the your right pupil. Note this measurement.

Measure your Left Eye. As in the instructions above this time look into the Right eye of the person doing the measuring and measure as above. Note this measurement.

Repeat the above as a double check and then uses these measurements in your order.

Recommended method - Use the instructions above but in this case wear a pair of glasses, any glasses, and have the second person put a mark the center of your pupils on the lenses of the glasses and then simply measure the distance between the dots.

How to measure your PD

The PD is important to us to ensure your glasses are aligned properly when we make them for you.

PD Far : This is the distance between the centre of your pupils when you are looking into the distance and is used (obviously) for distance glasses.

Multifocal Wearers : It is important to get both PD Far and Near if possible to assist us to make your glasses accurately.

Pupil Height : Check this links for more in-depth help on pupil height

Different ways to write the same thing ;

My PD (Pupillary Distance) is marked on my script as (example) Right 31 Left 32.5 (or similar) ?

This method is sometimes used by optometrists and it is the measurement from the centre of your pupil to the centre of the bridge of your nose respectively.

My PD (Pupillary Distance) is marked on my script as just 31(example).

The same as above but the distance is 31 from the centre of your pupil to the centre of the bridge of your nose on both sides hence the PD is 62mm
.

Another Method is (example) 65 / 63. This the best measurement and means your PD is 65 mm for DISTANCE (Far) viewing and 63 for NEAR viewing.

If you have any questions we are only too happy to answer them via our qualified Optometrists or technical staff . Contact Us Here

 


SphereTop

What is a Sphere reading
There is no need to go into detailed explanation except to say that this reading specifies the optical power of a lens and tells us amount of long or short sighted ness required. This value is in diopters.

OD and OS
OD simply means Right eye and OS means Left eye. Rarely used is OU which means Both eyes.

No Sphere reading
If your script does not have a Sphere reading then do not be concerned. It is Not Required.

Only one Sphere reading
There could be a sphere reading for you Left Eye and not your Right (or visa versa) and this is also fine.

Positive and negative readings
Spheres can be either positive or negative and you will see on your script a minus (-) or a plus(+) sign in front of your reading if it is a positive or negative reading. There should always be one or the other although some optometrists do not put a plus (+) in front of positive numbers as any number without a sign in from is in fact a positive number.

Plano
Plano means plane or zero or "no reading".

Bal (or balance)
If your vision in one eye is very poor the word 'balance' or 'bal' may be written in the Sphere Section. Just leave the Sphere reading as Plano, make a note in the comments section and send us a copy of your script with your order.


CylinderTop

The Cylinder reading
Is the amount of astigmatism in the eye. This is basically the irregular shape of the outside of the eye or lens inside the eye.

No Cylinder Reading ?
If your script does not have a Cylinder reading in one or both eyes then do not be concerned. It is Not Required.

Positive and negative readings
As with Spheres above the Cylinder readings can be either positive or negative and you will see on your script a minus (-) or a plus(+) sign in front of your reading if it is a minus. There should always be one or the other although some optometrists do not put a plus (+) in front of positive numbers


AxisTop

The Axis reading

The Axis Value is often NOT MARKED with the words AXIS but follow a "X" .

This is because your prescription is in fact a mathematical formula and the X is a Multiplication sign

A typical script could look something like ;

(OD) Right Eye   (OS) Left Eye
Sphere -2.5 X 135   Sphere -2.5 X 130
Cylinder -.5   Cylinder - 1

THE 135 AND THE 130 ARE THE AXIS VALUES

Please remember that you are very welcome to send us your prescription and we will interpret it and advise you how to enter this online.

 


PrismTop

The Prism Reading
The Prism readings are for those eyes that may not be properly aligned and may not be looking directly at the same object at the same time.

The Prism readings are rarely used. So if your script does not have these reading do not be concerned as none are required.

 


Add Top

The ADD Reading
The ADD reading is used for the reading portion of the lens and is added to the sphere value to produce the magnification strength for this reading portion. If an ADD reading is on your script against only One Eye then use this reading for both eyes (unless specified)

No Add Reading ?
If your script does not have an ADD reading in one or both eyes then do not be concerned. It is Not Required.



CheckingTop

After you have entered your script into the web site the program checks all the readings and if some vary , even slightly, from a "standard" script the program asks you to double check your script. It is only a way to help ensure that you have interpreted your script correctly and entered the correct values, nothing more.

If you are happy with the figures you have entered just accept the changes and continue.

If the program will not let you continue and keeps saying the same problems exists please contact us through the "Contact Section" of the web site and we can sort this out for you.

.


Send us your ScriptTop


You are very welcome to send your script to AusSpecs and have our professionals advise how to fill in the information required to purchase your glasses from AusSpecs.

You can email your script to uploads@ausspecs.com.au (for uploads only)


 

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