How do I adapt to varifocal lenses
The glasses passport - this is how you read it correctly
Your individual glasses values are in the glasses pass. In addition to your eyesight, other data are also relevant so that the optician can correctly adjust new glasses. They relate, for example, to the axis (A), sphere (Sph), cylinder value (Cyl) or pupillary distance (PD).
All important information about your current glasses and your individual prescription is summarized on the glasses passport. You always need this when you have one Manufacture or repair vision aids want to leave. The optician or ophthalmologist determines the correction values shown as part of an eye test and an eye measurement. They are just as standardized as the abbreviations listed on the glasses passport. The advantage: You are not tied to an optician, because every trained specialist can use the information to read how a lens has to be workedto optimally correct your ametropia.
Where do I get the glasses pass from?
You will usually receive the glasses pass, also known as the glasses prescription, after an eye test or with your new glasses. Because it no official regulations for design, glasses passports often look different. Mostly it is about Credit card-sized cardswhich contain various other information in addition to the name of the owner. At first glance, it is not that easy to understand what all the glasses values actually mean. But if you know what the abbreviations stand for, you can easily read your glasses passport correctly.
What does the information on the glasses pass mean?
All values are summarized on the glasses passport that are necessary in order to produce corrective glasses that match the respective prescription. The glasses passports themselves are not standardized, but they are Information and abbreviations are standardized. Every optician or ophthalmologist can read and interpret the glasses passport. You can also find them on the glasses pass personal data of the owner. In addition to the name, the date of birth and address are occasionally noted.
Get an overview of the most common abbreviations on your glasses passport here, so that you know exactly what is going on the next time you visit an optician.
R / Re and L / Li:
The capital R stands for the right eye, the capital L for the left eye. In line R (or Re) all correction values for the right eye are noted, in line L (or Li) the values for the left eye. The values are listed separately in the glasses passport, as their eyesight often differs.
F / N / G:
The abbreviations stand for the type of glasses required. If you have nearsightedness or farsightedness, you need one Distance glasses (F). If you have trouble reading and are over 40 years old, you most likely need one Close-up glasses (N). A Varifocals (G) is necessary if, in addition to your ametropia, presbyopia also occurs, which prevents you from seeing as clearly up close. However, since the type of glasses can also be derived from the information given in the sphere, these abbreviations are rarely used.
The abbreviation stands for the sphere of your glasses. This value is the Key figure for the ametropia and is given in diopters (dpt). A negative sign stands for nearsightedness, a positive sign for farsightedness. The higher the listed value, the more pronounced the ametropia is. The values are specified in 0.25 steps.
Cyl or Zyl:
This abbreviation describes the value of the cylinder of your eye, i.e. the Curvature of the cornea. It is only listed in the glasses passport if you have astigmatism. This is the case if your cornea is not evenly curved, but rather uneven. The cylinder value for the glasses is also given in diopters and has a positive or negative sign. The specification is again made in 0.25 steps.
A or oh:
The abbreviation stands for the axis, which is also only important for your glasses if you have an astigmatism. The value indicates in which direction the curvature is compensated. It lies between 0 and 180 and describes the angle on an imaginary circle, where 0 stands for vertical and 90 for horizontal. If a cylinder value is noted in your glasses passport, the corresponding axis value of the glasses is always located there.
PD means pupillary distance. This value gives the Distance between the center of the nose and the center of the pupil and is important for a good visual impression. As a rule, it is given in the glasses passport with two values that describe the distance of the respective eye to the middle of the nose. If only one value is listed, it describes the distance between the two pupils. The pupillary distance helps your optician to optimally adjust the glasses. The following applies: the more precise the value, the better the visual impression.
This abbreviation stands for addition and is only relevant for varifocals. The addition value of the glasses indicates the actual reading strength, which is added to or added to the ametropia in order to enable relaxed reading. This is given without a sign, as it is always a positive value.
P or Pr:
The abbreviation stands for prism and gives the prismatic effect of a spectacle lens. The prism value is only given in the case of ametropia or heterophoria. The strength of the primate is usually given in centimeters per meter (cm / m).
B or Bas:
The abbreviation stands for basis or the Base position of the prism. It is given in degrees or by direction. As a number of degrees, it can take values between 0 and 360. The direction is differentiated outwards / a, inwards / i, up / o and down / u.
You will need your glasses pass for this
If you can read your glasses pass, you will find out more about your eyesight and the severity of your ametropia. Besides, you can use him well if you want to buy new glasses - also online. The glasses pass contains all the information that is important for your optician. At Brille24, for example, you can simply enter your data yourself in the relevant fields during the ordering process. If you do not yet have a glasses passport and your correction values are no longer up-to-date, simply have an eye test done by an optician or ophthalmologist.
Questions about the glasses pass
If you lose your glasses pass, you can usually get it from the optician from whom you last ordered your glasses. Sometimes the values are also on the invoice of your last pair of glasses if you did not receive a glasses pass from the optician.
Of course you will get one from us Glasses pass with your order free of charge.
It is very likely that this is a so-called objective refraction, which is usually carried out automatically and without your information. However, the result is not exactly tailored to your needs and can easily be falsified, which is why this should only serve as a preliminary examination. For the production of your glasses we need the results of a subjective refraction, which is tailored to your current visual sensation and the result is recorded in steps of 0.25.
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