How to Read a Specsavers Glasses Prescription
Agreement your prescription
What do the letters, numbers and symbols on my prescription mean?
Apart from your name and engagement of nascence, y'all will find that there are quite a few letters, numbers and symbols on your prescription. This is what they all mean:
'+' or '-'
'+' – Shows if you are long sighted (longsightedness)
'-' – Shows if you are short sighted (shortsightedness)
SPH or Spherical number
This shows how stiff the correction needs to be. A '-' symbol above the number indicates shortsightedness whereas a '+' symbol indicates longsightedness. Other symbols that can exist establish in this department are the infinity symbol (which looks like a sideways eight) or the word Plano (or Pl), which are the equivalent of 'nothing' and are used when no sight correction is required. Some other common term that can be found on prescriptions is V/A (or visual acuity) which measures the standard of vision when corrected.
CYL or Cylinder number
This shows how much astigmatism yous have and the number tin exist negative or positive. Astigmatism is when the front office of your heart is shaped more like a rugby ball than a regular circle. If yous don't have an astigmatism, there will be no figures written in the cylinder and axis boxes.
AXIS
This shows the position of the cylinder. It volition be betwixt 1 and 180.
PD or Pupillary distance
This is the distance betwixt your eyes measured betwixt your pupil eye points. Unremarkably, the optician volition not add this to your prescription, and so you should enquire for it as it's important for those with high-force prescriptions to have lenses that are centred more than accurately. To ask for your PD, you can tell your optician that you will be purchasing an detail they do non stock, such as prescription goggles online.
ADD
This volition indicate if you need a prescription for reading and is applied to bifocal and varifocal lenses to right presbyopia. You may as well take an Inter Add for computers or other tasks like reading music on a stand up.
PRISM
This shows if yous have a musculus imbalance in your middle. It's less common to run across this box filled in as information technology's fairly rare. The prism is usually written in fractions (for case 1 ½).
BASE
This shows the direction of the prism in your lens, for example IN, OUT, Upwards or DOWN. This is fairly uncommon so the boxes are normally empty.
You tin read more than about different types of prescriptions here.
Common layouts of prescriptions
Below are examples of prescriptions. The start fix are standard - look through these to get a feel. It'south mostly handwritten prescriptions that cause bug but typed ones are generally easier to understand. For each prescription, we also included how it would announced when adding it to our website.
At the end of the folio are examples of unusual cases you may encounter, with instructions for what to exercise. Skip directly to the more unusual items.
This is a standard NHS prescription:
Information technology would be written equally follows:
NHS Scotland
- Here the signs take been written ABOVE the numbers - they are still just standard +/- signs.
- It tin can be hard to tell where one number ends and the next i begins. Information technology helps to know that sphere and cylinder will always be in the format (x)x.yy, with ten being a number from 0 to ten and yy being either 00, 25, fifty or 75. Axis is always a number betwixt 1 and 180.
It would exist written every bit follows (you tin click "My prescription is more circuitous than this…" to expand the menu):
Boots
It would be written equally follows:
Specsavers
It would be written as follows:
Vision Express
It would exist written as follows:
More unusual figures
If you need a prism for ane or both eyes, it volition look like to this:
We can provide lenses with a prism correction, but yous'll demand to contact us to discuss this.
Sometimes figures similar this announced on your prescription. These are non needed to make your lenses.
Some prescriptions have this figure, which looks like a sideways 8. This means 'infinity'. And you should select 'infinity' from the list.
This prescription too has some figures scrawled underneath - these are additions for both intermediate and nearly distances. Even though it's a single figure, it applies to both eyes.
To enter this, yous'll need to use the "My prescription is more complex than this…" link to bear witness the more avant-garde prescription expanse.
Sometimes opticians write 'DS' in the CYL column. This just means there is no astigmatism, and you tin can enter either nothing (leave the field blank) or select the phrase DS in the driblet downwardly.
Source: https://www.glassesdirect.co.uk/help/understanding-your-prescription/
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