Your prescription tells us exactly what your eyes need to keep things clear and comfortable. If you’ve ever wondered what all those numbers mean, don’t worry—you’re not alone! Want to know more about how we check your vision? Our eye tests explained page goes more in-depth on the process of testing your eyes.
The Sphere (Sph)
This indicates the power of the lens that is needed to correct your sight.
A minus power ( – ) means you are short sighted
A positive power (+) means you are long sighted
The strength of lens is indicated by the numerical value; lens power is given in 0.25 steps; the higher the value, the stronger the lens required.
The Cylinder (Cyl)
Cylinders or Cyls are prescribed to correct Astigmatism. Astigmatism relates to the shape of the front of the eyes, as the eye can be shaped like a rugby ball as opposed to spherical like a football; the rugby ball shape can cause vision to be distorted. Cylinders help to correct astigmatism by providing further power across one area of the lens.
Axis
The axis is linked to the cyl as it indicates its position. It enables the cylinder to be placed in the correct position when the lens is mounted into a frame.
Near vision add
The near vision add is an amount of power which, when added to the distance prescription, will provide clear vision whilst looking at something within an arm’s length.
Intermediate add
The intermediate add is an amount of power which, when added to the distance prescription, will provide clear vision whilst looking at something mid-range – a computer screen, for example.
Prism
Prisms are prescribed to help the eye muscles and reduce the feeling of eye strain or double vision (if present). Prisms help the eyes to work together.
Base
The base is the direction that the prism will be placed when the lens is being made.
An eye test isn’t something to be afraid of. Remember, if you’re struggling with your eyes, it not only restricts your vision but can also cause other problems, such as headaches. By getting the correct prescription, your eyes will no longer be under strain and you may find that you have a much better quality of life.
If you have any further questions when it comes to understanding your glasses prescription, understanding diseases of the eye or whether to choose glasses or contact lenses, don’t hesitate to get in touch.
If you have had an eye test and have been wearing your new glassws, but are still experiencing issues with your vision, headaches or dizziness, contact your local Scrivens branch.
