How to read your prescription ?


Understanding your prescription  


It’s a match! At Jimmy Fairly our in house specialists take great care in finding you the perfect pair of eyeglasses and sunglasses for your prescription. Eye exams are the only way to make sure that you are getting the correct glasses prescription and vision correction. Directly following an exam, our optometrists will provide you with a prescription so you can unlock clear vision!


Here's the low-down on prescriptions...



SPH on your glasses prescription is short for ‘sphere’. It is listed as a positive or negative number, and it indicates the power of correction you need, and is measured in diopters. A ‘+’ shows if you are long-sighted (known as Hypermetropia) and a ‘-’ shows if you are short-sighted (commonly referred to as Myopia). Each eye usually has a different value. The SPH on your prescription can influence your choice of frames as the higher the prescription, the greater the curve of the lens needs to be (we recommend smaller glasses for higher prescriptions for this reason).



CYL on your prescription stands for cylinder. It indicates the amount of lens power needed to correct astigmatism, measured in diopters. Astigmatism is when the cornea is not shaped like a perfect sphere, because of this the light doesn’t focus onto a single point on the retina, which then gives you distorted vision. If the number on your prescription is low, it means your eyes are just off from being round, and if you have a higher number, it means your eyes are shaped more like an oval.



The axis number on your prescription tells your optician which direction they must position the cylindrical power in your glasses lenses (this is required for people who have astigmatism). It is shown in an angle in degrees from 1 to 180.



This number tells you the direction of the prism in your lens, for example IN, OUT, UP or DOWN. This is also pretty uncommon so the boxes are usually empty.




👀 Still have questions? Pop in to see us at your nearest Jimmy Fairly store and our opticians will be happy to help answer anu queries you may have :