HOW TO READ YOUR EYEGLASS PRESCRIPTION
When taking an eye test at an eyewear store, you will usually get one of the two results sheets, some stores work carefully, you will be asked for your full information, and your prescription will be on an examination form. Some other stores is a little quicker, you will receive a piece of thermal paper printed directly from the automatic gauge.
Baro Optic will guide you to learn the parameters on the result sheet to read the accurate near / far distance to cut lenses:
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R/Right/OD: Right eye vision test result
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L/Left/OS: Left eye vision test result
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S/SPH/Sphere/Cầu: degree of nearsightedness (-) or farsightedness (+)
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C/CYL/Cylinder/Trụ: It measures in diopters the degree of astigmatism
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A/AX/Axis/Trục: the orientation of the astigmatism, you don't need to care about this number
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S.E: Recommended number of glasses degrees
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PD: Pupillary distance (milimeter)
When purchasing at Baro Optic, we need you to provide your prescription and PD measurements for cutting glasses.
HOW TO MEASURE PUPILLARY DISTANCE
PD (Pupillary Distance) is a measure of the pupil distance, from the right eye to the left eye under natural straight viewing conditions, unit: mm.
The pupil distance is the sum of two distances from the bridge of the nose to the pupil of each eye, so there will be patients with different eye spacing.
In lens grinding technique for people with refractive error, in addition to the number of degrees of the exact lenses,
The doctor also needs your measurements of the PD to make glasses more accurate.
How to measure
The way to measure the pupil distance is quite simple, you can do it yourself or ask another one to help you.
All necessary tools are a ruler in millimeters (mm) and a mirror.
Step 1: Stand about 20 cm away from the mirror, not too far away and close enough that we can see the pupils of the eye. Place the ruler on top of the brow area to make it easier to measure.
Step 2: Close the Right eye and place the "0" position of the ruler corresponding to the pupil of the Left eye on the eyebrow (or on the forehead).
Step 3: Without moving the ruler, close the Left eye, open the Right eye and measure the distance from the "0" to the pupil in the right eye. This distance (in mm) is the single pupil distance.
We can also ask another one to measure us by applying the steps above.