Vision Correction Calculator

What are my options?

So you’re thinking about ditching those glasses or contacts but not sure what treatment choices are out there for you?

The array of options can sometimes be overwhelming. Should you have laser vision correction, ICL surgery, refractive lens exchange or cataract surgery?

Our vision correction calculator takes your age and spectacle prescription into account and can give you a good idea of the treatments available to you.

If you’re not sure what your prescription is or what it means, don’t worry, all is explained below!

Try our Vision Correction Calculator!

Enter your age details, the prescription for the right and left eyes to the nearest number and press enter. Your customised vision correction options will then pop up. If your prescription to 0.5 of a dioptre is not listed please get in touch or choose the nearest value.

How old are you?

Less than 21
Older than 60

What is your prescription?

Enter your right and left eye details below:

Right Eye:



Left Eye:



Understanding your prescription

If you wear glasses or contact lenses, you will have seen your optician at some point and should have your prescription printed or written down somewhere.

Your prescription from the optician should look something like this:

OD -4.00 -1.00 45
OS -3.50 -0.75 32
Add +2.00 +2.00

But what does all this mean?

Here are some explanations:

OD or oculus dexter is the latin term for right eye.
OS or oculus sinister is the latin term for left eye.

Some opticians now use the abbreviations RE and LE when referring to right and left eyes instead of the original latin abbreviations.

Sphere (SPH) – this tells us the amount of lens power in diopters (D) required to correct either short sightedness (negative power) or long sightedness (positive power). In the example above, the sphere is -4.00 indicating the individual is short sighted and requires 4 Dioptres of negative power to correct the prescription.

Cylinder (CYL) – this tells us the lens power required to correct any astigmatism that is present. In astigmatism, the eyes are shaped more like a rugby ball (rather than a football) and hence require more power in one area compared to the other. The power can be recorded in negative or positive format depending on your optician’s preference.

Axis – This is the axis at which the lens power of the cylinder is applied and is a number between 1 and 180 degrees.

Add – This is the additional lens power required on top of what is already present in the glasses to help with reading. A reading Add is usually required for patients above the age of 45 to allow them to read and is incorporated into bifocal or varifocal lenses.