Understanding your Prescription
Your prescription is a summary of information to ensure that you can get the best vision possible when wearing spectacles. An outline of some of the information which may be entered on your prescription is explained below.
SPHERE - This specifies the strength of lens needed to correct the focus of your eyes. A + (plus) sphere corrects long sightedness (hyperopia) when the sufferer has difficulty focusing on close objects. A - (minus) sphere corrects short sightedness (myopia) when the sufferer has difficulty focusing on distant objects.
The CYLINDER and AXIS are used to correct an ASTIGMATISM where the eye is shaped like a rugby ball instead of a perfect sphere shape. To correct this problem a cylindrical lens, which only has the power in one direction or axis, is used.
The ADD is the additional correction required for reading.
A PRISM is used to try and correct a lazy eye or double vision. More accurate measurements whilst wearing your frames are needed if you have a prism in your prescription. Prism lenses are measured in prism dioptres.
The PD or PUPILLARY DISTANCE is the measurement between the centre of
your pupils.
SPHERE - This specifies the strength of lens needed to correct the focus of your eyes. A + (plus) sphere corrects long sightedness (hyperopia) when the sufferer has difficulty focusing on close objects. A - (minus) sphere corrects short sightedness (myopia) when the sufferer has difficulty focusing on distant objects.
The CYLINDER and AXIS are used to correct an ASTIGMATISM where the eye is shaped like a rugby ball instead of a perfect sphere shape. To correct this problem a cylindrical lens, which only has the power in one direction or axis, is used.
The ADD is the additional correction required for reading.
A PRISM is used to try and correct a lazy eye or double vision. More accurate measurements whilst wearing your frames are needed if you have a prism in your prescription. Prism lenses are measured in prism dioptres.
The PD or PUPILLARY DISTANCE is the measurement between the centre of
your pupils.
