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| Help Topics : Entering your Eye Doctor Prescription Online
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 | Prescription Help | |
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| Please Note: Prescriptions can change, so please do not enter prescriptions older than 1 year for normal vision and 6 months for people with. |
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| Eyeglass and Contact Lens Prescriptions Refer to Lens Powers |
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| Here's a quick overview of common terms used in eyeglass and contact lens prescriptions: |
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OD: Oculus Dexter is Latin for right eye.
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OS: Oculus sinister is Latin for left eye.
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Sphere, SPH, or S: Sphere is associated with curvature of the eye lens. A + ve number indicates you are farsighted and a - ve indicates you are nearsighted.
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Cylinder, CYL, or C: Cylinder is associated with irregular curvatures in the cornea and eye shape that cause focusing distortions associated with astigmatism. Cylindrical (toric) lenses have specific curvatures and orientation that compensate for eye surface irregularities.
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Axis: Axis is related to how the lens will be oriented in degrees to help determine whether, in focusing, images will be elongated or constricted to help offset vision defects associated with astigmatism.
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Add: is used for people with both farsighted and nearsightedness, this number will indicate the nearsighted power in there vision. We have Bifocals and Progressives available for you.
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PD/ Pupillary Distance: is the distance between the center of two pupils (center black dots between the eyeball).
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| Here's a quick overview of common terms used in eyeglass and contact lens prescriptions: |
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| Doctors have different ways of writing Prescriptions. The following samples show 3 ways of writing the same prescription. |
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| Rx |
SPH |
CYL |
AXIS |
ADD |
| RIGHT(OD) |
-2.25 |
-1.75 |
95 |
+1.5 |
| LEFT (OS) |
-1.50 |
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90 |
+1.5 |
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| Fig. A |
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| Rx |
SPH |
CYL |
AXIS |
ADD |
| RIGHT(OD) |
-2.25 |
-1.75 |
95 |
+1.5 |
| LEFT (OS) |
-1.50 |
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90 |
+1.5 |
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| Fig. B |
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Rx |
SPH |
CYL |
AXIS |
| DIST. |
RIGHT(OD) |
-2.25 |
-1.75 |
95 |
| LEFT (OS) |
-1.50 |
-1.50 |
90 |
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Rx |
SPH |
CYL |
AXIS |
| NEAR. |
RIGHT(OD) |
-.25 |
+1.00 |
95 |
| LEFT (OS) |
-1.50 |
-1.50 |
90 |
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| Fig. C |
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1) Pay special Attention to the Signs. A (+) Plus power is not the same as a (-) minus power.
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2) Distance may be abbreviated as D.V and Near may be Abbreviated as N.V
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3) Decimal Points may be left out as in figure B
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4) If there is a blank space in your Rx, then leave that value as blank in the online prescription form. For example : if your Rx has only SPH powers, then fill in the appropriate value in the form and leave all the rest blank.
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5) Distance power and near power may be given separately and no ADD power specified, as in FIG. C. Enter the Near vision power if you want near vision glasses and enter the Distance power for distance vision glasses.
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6) If there is only one Add Power, It is understood that it is for both eyes
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7) Some doctors might use a blank sheet of paper. Please remember that the first row is for Right eye and the second for the left eye. The first number in the row will be sphere, second is cylinder, third axis and fourth add.
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How to measure your PD
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PD is important for the placement of lenses inside your frames. To measure your PD, have a friend take a millimeter scale and measure the distance between your pupils (black dots in the center of your eye).
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Place the ruler flat on your fore head, and line the zero with the pupil of your left eye, Take the reading where the pupil coincides with the right eye.
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P.D of adults is generally between 55 to 65.
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P.D of children is generally 44 to 54.
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If your doctor supplies you with a P.D which has two numbers, then the first number is the Distance vision P.D and the second number is the Near vision P.D. For example: 63/60 .Enter the first PD if ordering Distance vision glasses and the second PD if ordering near vision.
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