Glasses and Contact Lens Prescriptions Worcester  - Specs Express Worcester 01905 613037

10 St. Swithins Street, Worcester WR1 2PS

Glasses & Contact Lenses Prescriptions

Your Sight Prescription

Your prescription gives us details to provide clear and comfortable vision & whether corrective lenses are required or not.  All Opticians work to the same guidelines when writing a prescription which look very like this sample (NHS) prescription.


Contact us if we can help with more information or to book an eye test.



The Sphere (SPH)

The sphere or SPH number on your prescription indicates the amount of lens power needed (prescribed) to correct  your vision. The number has a minus sign (–) to correct short sightednessor a plus sign (+) to correct long sightedness. The higher the number the stronger the lens needed.


The term "sphere" means that the correction is spherical or equal across the eye.


The Cylinder (CYL)

The Cylinder or CYL number on your prescription indicates the amount of correction to remove any visual distortion, caused by an irregularly shaped cornea known as an astigmatism. If there isn't a number you either don't have an astigmatism or it is very slight.

The Axis

The Axis measurement is used in your prescription to ensure that the CYL is correctly positioned. It is given in degrees from 1 to 180.

The ADD (Addition)

The ADD Inter is the amount of correction needed on your prescription for you to cope with intermediate distances, such as working at a computer or reading music.

ADD Near is the amount of correction needed on your distance prescription so you can see near objects clearly, such as reading a book or map. 

A Prism

A Prism is not commonly prescribed on an optical prescription. Occasionally it is prescribed to correct a crossed-eye (strabismus) or other eye muscle /focusing disorder.

PD / Pupillary Distance

The pupillary distance (PD) is the distance between the centers of the two pupils between the eyes. This measurement is essential to ensure glasses are comfortable to wear and provide correct vision.