Explore your vision
Make sense of the notation
Understand Your Prescription
Explore example numbers, abbreviations and the axis graphic.
Opening the interactive experience…
Make sense of the notation
Explore example numbers, abbreviations and the axis graphic.
Opening the interactive experience…
A spectacle prescription records the optical correction measured during an eye examination. This tool explains common abbreviations; it does not check whether a prescription is correct or suitable.
Enter example values only. This is not an eye test, ordering system or contact-lens conversion.
Orientation illustration only. AXIS is meaningful when a CYL correction is present; it does not show the shape of the eye or a lens recommendation.
In this example, the notation represents…
SPH is the main spherical lens power, measured in dioptres. A minus value is commonly used to correct myopia (short-sightedness); a plus value is commonly used to correct hyperopia (long-sightedness).
PD (pupillary distance) is a measurement used to position spectacle lenses correctly in front of the eyes. It is not the same thing as the optical prescription.