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Prescription Information Your prescription contains information to ensure the best possible vision from your spectacles. Don't worry if your prescription doesn't contain all of the following values, not everyone has astigmatism for instance. The SPHERE specifies the strength of lens required to correct your focus - a plus lens to correct long sight (hypermetropia - difficulty focusing on near or distance objects) and a minus lens to correct short sight (myopia - difficulty focusing on distant objects.) The CYLINDER and AXIS correct astigmatism. So what's astigmatism? Astigmatism is where the eye is shaped like a rugby ball, not like a football. This just means the eye may have difficulty focusing at any distance. The ADD, short for Reading Addition, is the additional correction required for reading, this could be used to make either reading glasses or bifocal or varifocal glasses. A PRISM is to try and correct a binocular problem and is prescribed to prevent eyestrain, and to help your eyes work properly as a pair. If your prescription contains a prism we will require your EXACT pupil distance. The PD, or Pupil Distance, is the distance in millimetres between the centre of your pupils, this isn't a major factor with lower prescriptions (roughly - spheres and cyl's less than two) unless you have exceptional features. For higher prescriptions it is recommended because it enables us to make your spectacles as effective as possible. You will sometimes see two values, one PD at distance and one PD for near vision (reading.) If you do just put the details in the notes section of your prescription.