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Optician Q&A

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Can I order lenses with prism correction?


Yes, we are able to process prism lenses with correction. 


What is prism correction?

Prism correction is a necessary component of some prescriptions lenses designed to avoid problems with double vision or diplopia. Sometimes, our brain fails to use both eyes together, leading to troubles of focusing (accommodation), turning the eyes (convergence and divergence) or double vision.


How does prism correction work?

People with double vision see two images at the same time as the light falls in different places on each eye's retina. The lenses in prism glasses redirect the lights before they travel through the eye to make it fall correctly on the retina in each eye. This process of bending and focusing light is known as refection. It helps the brain to fuse the two retina images together and produce one clear image.




Your prism prescription for prism glasses

Prism glasses are measured and prescribed in a measurement unit called prism diopters and may include one of four measurements relating to the "base", that is, the direction of the prism with respect to the thickest edge of the lens.


These are Base Up (BU), Base Down (BD), Base In (BI) and Base Out (BO), and they're usually measured in half-diopters (e.g. 0.5 or 1).


For example, a prescription may include the prism correction:

LEFT: 0.5 BU
RIGHT: 0.5 BD 


Please fill in your prism details into the additional information section when entering the details of your prescription. You can also contact our customer service prior to placing your order. 


The earlier you deal with the double vision causes, the better would be the result and prism glasses are a perfect solution for this problem.


If you have any further queries, feel free to ask our optician! Find out all about our online optician Caitlyn here.

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