Parts List Manual
Different Parts Of An Eyeglass Prescription
Optometrists or ophthalmologists are the people accountable in providing eyeglasses prescription. A series of battery tests or eye examinations will be performed by these specialists to identify the eyeglasses or lenses that are suitable for a particular vision-impaired individual. Following the examinations, figures would be entered by these professionals at the prescription paper.
Read the following to know the parts of an eyeglass prescription.
OV – oculus dexter or the value of your right eye. United Kingdom and other countries also use the term RE to signify right eye.
Spherical – or the SPH. It is responsible in correcting refractive errors using either divergent or single convergent refractive powers.
Prism – like Base, it is usually left empty. Figures entered here will be responsible in correcting eye muscle imbalances and other related disease.
NV – meaning, near vision. The figures entered in this slot are the ones responsible in enhancing the patient’s vision of near objects.
Cylindrical – otherwise known as CYL. These are the values responsible in correcting astigmatic refractive errors. There will be either addition or subtraction of refractive powers in CYL.
Back Vertex Distance – it is the space between the back of the lenses and the front of your eyes.
OU – oculi uterque or the figures of your two eyes (left and right).
Prism – like Base, it is usually left empty. Figures to be entered in the prism indicates the need to correct imbalances of the eye muscles and related diseases.
Base – it is not usually used or it has left blank. It indicates the direction of the image displacement. It works with Prism.
You need to have your current prescription before purchasing the perfect prescription specs for you. If you are just going to estimate the values, there is a big tendency that you are likely to worsen your vision.
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