¿HOW TO READ MY EYEGLASS PRESCRIPTION?
¿HOW TO READ MY EYEGLASS PRESCRIPTION? , It is very easy...
HOW TO READ MY EYEGLASS PRESCRIPTION?
your eyeglass prescription may look complicated, but it's actually very simple. Although the format of the formula may vary slightly, the information is the same.
The eyeglass prescription can be divided into two parts, one for distant vision, the other for close-up as shown in Example 2, or a single part as seen in Example 1. In every optical prescription there are two sections, one for the right eye (OD) and one for the Left Eye (OS or OI). The values indicated in each of these sections will indicate the correction terms you need. Each section can contain the following elements:
Indicates the diopters that correct refractive errors such as nearsightedness (with negative (-) sign) or farsightedness (with the positive (+) sign). The notation appears as sphere, sph, or sph.
The value of the sphere is recorded in steps of 0.25 Diopters (+1.25, -2.50, +3.75). If the word NEUTRAL appears in the sphere box, it means that the value of the sphere is 0.00.
It is the power in diopters that indicates the amount of Astigmatism. Usually it appears with negative sign (-) although some professionals write it with positive sign (+). The most used notations are: Cylinder, Cilindro, Cyl or Cyl. EAstigmatism may be associated with Myopia and / or Hyperopia. All cylindrical value is accompanied by a value noted in the axis box.
If the cylinder box is empty, it means that you do not have astigmatism, and therefore, the value will be 0.00
The axis indicates the direction of the cylinder and is expressed in degrees ranging from 0 ° to 180 °. Look at example 1 where the value of the astigmatism axis of the right eye is 160 °, and the axis of the left eye is 10 °
The addition, also known as ADD, is expressed in diopters and is the value used to correct presbyopia. This value is added to the distance correction so that the user has a good close up view. This information appears in bifocals and progressive lenses. If an ADD value appears in your formula, it usually also shows the type of correction you need, either BIFOCAL or PROGRESSIVO.
» EXAMPLE 1 «
If the Addition value is not included, your correction is for SINGLE VISION (VISIÓN SENCILLA) (see example 2).
» EXAMPLE 2 «
Sometimes in your eyeglass prescription you can see other values such as:
» PRISM and BASE:
The prism, expressed in Prismatic Diopters, is the value used to correct a muscular imbalance and / or alteration of the binocular vision, in other words, a deviation of the eye. The value of the prism will always be accompanied by the direction of the prism base (Upper, Lower, External or Internal Base) If you find this value in your prescription, please contact us.
» PUPILLARY DISTANCE
LThe pupillary distance is the measure between the two pupils. This measurement is very important when making the lenses. The optical centers of the lenses must match the center of each pupil. And the only way to do this is by knowing this value.
You can find one or two values of pupil distance, noted as DP (Pupillary Distance) or DNP (Nasopupilar Distance)
If the pupillary distance does not appear on your prescription, and if you do not know it, tuopticaenlinea.com offers the option to measure it virtually at the time you are trying on the frames or in the process of selecting the type of lenses for your glasses. Read more
» VISUAL ACUITY (A.V.)
Although visual acuity is not required to make your lenses, it is very important for you, as it indicates the percentage of vision you will have with your glasses.