#One eye spectacle plus#

Close your right eye and align the ruler end with the.Hold a ruler against your brow or cheekbones.Getting the two-number PD is always the best choice when creating custom made eyewear as it centers each Rx in front of each eye, versus the less accurate method of dividing the single number by two. The first number in a twonumber PD is the Right or OD. PD is measured in mm and can be one number like 64 or two numbers like 31/33. It's important to measure from the center of one pupil to the center of the other. If it's not included in your prescription, you can easily measure it yourself. Pupillary distance measures the distance between your pupils. We are not able to accommodate eyeglasses prescriptions that need Prism. The Prism value refers to the number ofĭiopters applied to compensate for image alignment issues. Prism is used to correct double vision or vision displacement. PAL is used in some cases by doctors when the addition for progressive lenses is different compared to bifocals. Only used for multifocal (progressive/bifocal) lenses, ADD refers to the added magnifying power applied to the bottom of the lens in multifocal lenses. If your prescription includes Cylinder lens power, it must include Axis as well.

The Ax number refers to angle degrees (1 to 180). Like CYL, Ax only applies to astigmatism prescriptions.

#One eye spectacle plus#

As with Sphere, a minus indicates lens power for nearsighted astigmatism, a plus indicates farsighted astigmatism. If you have no astigmatism or very slight one, this column will be blank. A plus (+) sign next to the number refers to farsightedness correction.ĬYL is the lens power (also called diopter) used to correct astigmatism. A minus (-) is used to correct nearsightedness. Measured in diopters, the SPH number refers to the lens power necessary for each eye.

And sometimes you will see RE and LE for right eye and left eye respectively. Some doctors may use OU to reference both eyes. and O.S., they are Latin abbreviations for right eye (OD) and left eye (OS). OD and OS are key to reading any eyeglasses prescription, regardless of the correction type. If you have two ADD values in your prescription (i.e.- ADD +2.00 and ADD +2.25 PAL), the ADD value with PAL (i.e.- 2.25) should be entered into the wizard ADD section.Ĭheck out the following glossary for even more details on what the numbers in your eyeglasses prescription mean:ġ. If there is 'DS' or 'Sph' or 'Spherical' in the Cylinder space it indicates no correction is needed. What if I have SPHERE/SPH/S/DS under CYL? If there is 'Plano' or 'PL' in the SPH section of your prescription, it means no nearsighted or farsighted correction is needed. The type of Rx glasses may be noted on a prescription, such as DV and NV. On any prescription, PD can be written in different ways: e.g., 62 (Single PD), 33/31 (Dual PD), or 62/60 (Distance PD/Near PD).įor multi-focal glasses, as well as reading and computer glasses, your Rx will include an ADD or NV value. Sphere (SPH) and Cylinder (CYL) always have a (+) or (-) sign. values are usually entered with computer, but may be handwritten by doctor. The most common prescription format is in the way of a grid with clearly printed fields for OD, OS, SPH, CYL, etc. On your script you will have a sphere (to indicate the strength of the lens you need), a cylinder (which indicates the lens power needed to correct astigmatism), and an axis (which indicates where to place the lens correction for astigmatism), among a few other details. Trying to read a lens prescription can be confusing and you need to get the formula right so we can make the best pair of glasses for you.