Eye Power Prescription
Here are some examples of of Eye prescriptions given by practitioners:
OD (Oculus Dexter) - Latin term for Right Eye
OS (Oculus Sinister) - Latin term for Left Eye
Axis - Mentioned only if you have cylindrical power
V/N (Vision) - Potential/improvement of your respective eye's sight with the mentioned powers.
PD/IPD - Pupillary distance/Interpupillary distance, Opticians require this when they make high powered glasses or progressive glasses to maintain the centering of the spectacle lenses along with your eyes pupillary center (blackcenter portion of your eyes)
If you have ONLY spherical power:
Above is a sample Eye power prescription of those who have only spherical power. In ONLY spherical power prescription, CYL (Cylindrical) column and AXIS column will be empty.
Simple Scientific explanation:
In only a spherical power condition, all the light rays after entering your eye do not focus on retina, intead it gets focused in front or behind the retina.
Example of a normal eye:
If you have cylindrical power/If you have ONLY cylindrical power:
In the above prescription, you can see the CYL (Cylindrical) column and AXIS column is filled, which means you have astigmatism.
Simple Scientific explanation:
In cylindrical power condition, some light rays may/may not focus on retina and some are focused in front or behind the retina, after entering your eye.
If you have READING/NEAR power:
Above are the examples of prescriptions of people who have been prescribed with Near power separately. Practitioners, write either by simply writing ADD in the NV (Near vision) column or by filling the whole NV column.
If you are 35 and below, you just have to look at Distance vision(DV).
People below 35 don't get seperate reading power (ept for some rare cases). Young people/People below 35 have active eye functions, which make them read anything at a reading distance(25-40 cm) even without their glasses on. Their is no hard and fast rule to wear glasses on while reading. People with minus power can read near things better without glasses on (Not in case of high minus powers like above -4 diopters or -5 diopters, they may have to bring reading material closer than normal reading distance).
If you are 40 and above, you also have to look at Near vision (NV) or Addition (ADD).
It is the separate power prescribed for Near vision. If you observe, in a normal eye check up process, first the practitioner prescribes you power for distance and at last he ADDS power onto the distance power in a trial frame to make you read a near reading chart. Near vision and Addition are different, calculation wise, that is a part taken care of, by us (Opticians).
This may be a bit confusing, but ,You need not to put so much brain, working out that, as for your convenience, we have provided a "Upload Spectacle presciption" option, even if you are doubtful in choosing your eye power from the dropdown menu, we can confirm your power through your uploaded prescription.
But it's always good to take proper counselling from your Eye care practitioner/Eye doctor, as they can guide you through your Eye prescription very well. There may be 2 in a every 100 case, where the above description won't abide.