>> I have PLANO /PL on my prescription.
>> I have SPHERE/SPH /S/DS under CYL on my prescription.
>> I have a prescription, how to read it for different uses.
>> I don't have PD on my prescription.
>> I just have one ADD number on my prescription.
>> I have NV/DV/SV on my prescription.
>> I have +200 on my prescription and you just have +2.00.
>> I have BALANCE/BAL on my prescription.
>> I have PAL （progressive addition lens ）on my prescription.
" Plano" or " PL" means there's no strength for Sph in your prescription. Just leave it as a zero or Plano when entering the prescription on the order form on our website.
If the optometrist wrote "DS" or "Sph" or "Spherical" in the Cylinder space, it indicates no correction and should be entered as 0 on the order form. This means that the eyeball is spherical and has no oblongedness, and consequently has no Cylinder or Axis values.
For progressive or bifocal glasses, the prescription can be read as:
For single vision distance use, the prescription can be read as:
For single vision computer use, the prescription can be read as:
|PD：29.0/30.5 or 28.5/30.0|
For single vision reading use, the prescription can be read as:
Followings are the rules of how to convert a multi-focal prescription to different uses.
To convert a multi-focal prescription with ADD values for single vision distance use, simply remove the ADD values. The correction for the astigmatism will not change, so the cylinder and axis will remain the same, regardless of the change in focal distance. Use the original distance PD listed in the prescription.
To convert a multi-focal prescription for single vision computer use, simply combine half of the Add number and the Spherical number (If the Add cannot be split evenly, such as ADD +2.25, both +1.25 and +1.00 can be used to convert the prescription). For example, if the Add were +2.25 and the OD-Sph was -0.50, the new OD-Sph for computer glasses would be +0.75; if the Sph were +0.25, the new Sph would be +1.50. Consequently, the Add will then become zero, the default. The correction for the astigmatism will not change, so the cylinder and axis will remain the same, regardless of the change in focal distance. Narrow the PD by 1-2 mm. If the PD of your basic prescription is 29.5/31.0, the PD for computer glasses would be 29.0/30.5 or 28.5/30.0
To convert a multi-focal prescription for single vision reading glasses, simply combine the Add number and the Spherical number. For example, if the Add were +2.25 and the OD-Sph was -0.50, the new OD-Sph for reading glasses would be +1.75; if the Sph were +0.25, the new Sph would be +2.50. Consequently, the Add will then become zero, the default. The correction for the astigmatism will not change, so the cylinder and axis will remain the same, regardless of the change in focal distance. Narrow the PD by 3mm. If the PD of your basic prescription is 29.5/31.0, the reading PD would be 28.0/29.5.
When you have finished an ophthalmic examination or vision test, doctors will write your PD on the prescription. Generally, there are two different PD values, one of them is your basic PD, which is the distance in MM between the centers of your pupils. The other is mono PDs( PD for each eye), two numbers around 30mm. If you don't have any PD values on the prescription, you have rights to contact your doctor/optometrist from whom you received the prescription to get your accurate PD value. Or you can ask help from a family member or a friend and let her/him measure out your PD by following the measurements below.
1. Both of you should sit down approximately 45cm apart from each other. The person having his/her PD measured needs to keep both eyes open.
2. The ruler is held against the forehead as shown above. The person having the PD measured looks into the open eye of the person taking the measurement. The "0" is lined up with the centre of one pupil. Record the number lining up with the centre of the other pupil in millimetres. This is the measurement for the "near PD". Neither person should move their head during this procedure. This procedure will not work if the person having their PD measured has a turned eye. You have just used this technique to measure your near PD.
When you enter your PD details on the GlassesShop glasses prescription form, enter the number you have just measured into the "near PD" field. Enter your "distance PD" which is calculated by adding 2-3mm to the "near PD." (This rule is accurate for most people).
Eg Near PD= 57
Distance PD= 57 + 3= 60
Instead of using the centre of the pupils, you can use the edge of the pupils as shown below. (Be careful not to use inside edge of one pupil and outside edge of the other pupil.)
For most people, ADD will be the same for both eyes. It is typically the same positive number, for both eyes, although it may be written only once on your prescription. It may also be written as a large, positive number, across both the OD and OS lines of your prescription.
NV stands for near vision for reading use or computer use. DV stands for distance vision all time wear or daily use,. Doctor usually use this to distinguish different usage.
SV means single vision. Doctor use this to tell you that you need single vision lens instead of bifocal or progressive lens.
There are two different ways to write numbers on prescription, but they have the same meaning. If you have +200 on the prescription, just enter +2.00 in the prescription form. Similarly +275 should be entered as +2.75 in the form.
Balance indicates that the eye for which the designation is made, is not sighted, and that the same numbers should be entered in both eyes, in order to have the lenses matched in appearance and weight.
PAL,the Progressive Adjusted Lens. Because of the limited reading area of a progressive lens design, the Add portion of a prescription is increased by a quarter of a diopter (typically) to compensate by increasing the size of the image. It does not change the size of that portion of the lens. If you have two ADD values in your prescription, the ADD value +2.00 should be used for both eyes of bifocal while ADD value +2.25 should be used for both eyes of progressive.