Number of glasses prescription Associate the shape of your glasses with the strength of your vision. These will help you know if you are nearsighted, farsighted, or astigmatic, and to what degree.
Knowing what to look for will help you understand the numbers and abbreviations on the glasses. prescription chart.
OD and OS: one for each eye
Ophthalmologists use the abbreviations “OD” and “OS” to refer to the right and left eyes.
Your ophthalmologist may give you a piece of paper. prescription It looks like this.
OD is the right eye; OD stands for Oculus Dexter, which is Latin for “right eye.
OD is the left eye; OS stands for Oculus Sinister, which is Latin for “left eye.
Your vision prescription You can continue to include columns labeled “OU.” This stands for Oculus and means “both eyes” in Latin.
These abbreviations are common on prescriptions for eyeglasses, contact lenses, and ophthalmic products, but some physicians and practices have decided to modernize their abbreviations as follows eye prescriptions Re (right eye) and LE (left eye) instead of OD and OS.
Information for the right eye (OD) will always appear before information for the left eye (OS). Your ophthalmologist writes prescriptions Thus, when they look at you, they see your honest eye on the left (first) and your left eye on the right (second).
Sphere (SPH).
The sphere indicates the power of the lens prescribed to correct nearsightedness or farsightedness. Lens power is measured in diopters (D).
If the amount in this section has a minus sign (-), you are nearsighted.
If the values in this section have a plus sign (+), you are a visionary.
The term “spherical” means that the correction for nearsightedness or farsightedness is considered “spherical” or equivalent at all meridians.
Cylinder (cylinder)
The cylinder indicates the power of the lens, which is important for astigmatism. It always tracks the strength of the sphere on the glasses. prescription .
The cylinder column numbers can be marked with a minus sign (for correcting myopic astigmatism) or a plus sign (for mild astigmatism).
If nothing appears in this column, either there is no astigmatism or the level of astigmatism is so small that it does not need to be corrected.
The term “cylinder” means that this lens power added to correct astigmatism is not considered spherical and is shaped so that the meridian does not contain any additional curvature and the meridian perpendicular to it has maximum power and curvature with “no additional power”. The lens has right astigmatism.
The meridian of the eye is oriented by way of placing the transport scale on the front plane of the eye; the 90 degree meridian is considered the vertical meridian of the eye, and the meridian is considered the 180 degree quartz meridian.
The meridian of the eye is oriented by way of placing the transport scale on the front plane of the eye; the 90 degree meridian is considered the vertical meridian of the eye, and the meridian is considered the 180 degree quartz meridian.
The axis outlines the meridian of the lens without cylinder power to correct astigmatism.
If an eyeglass prescription It remains imperative to connect the meaning of the axes that follow the footprint of the cylinder power, including the output of the cylinder.
The axes are oriented with numbers from 1 to 180.
The number 90 corresponds to the vertical meridian of the pre.
The number 180 corresponds to the horizontal meridian of the ochi.
The ash is the meridian of the lens and is at a distance of 90 degrees from the meridian having the power of the cylinder to correct astigmatism.
The “add” is the extra magnifying power used at the bottom of a multifocal lens, a natural defect of aging.
Numbers displayed in this section the prescription It is always considered a positive strength even if a positive signal is not indicated. As a rule, intensities range from +0.75 to +3.00 D and are the same in both eyes.
Prism
This is the strength of the prism as measured by the prima dioptres (“P. D.” or triangle), which is specified to compensate for the adjustment task of the eye.
Only a small portion of eyeglasses prescriptions includes a prism measurement.
Where available, the number of prisms is referred to in metric or British fractional units (0, 5 or ½) and the purpose of the prism is indicated by marking the nominal position (maximum edge) of the “base”.
Four abbreviations are used for the direction of the Prism: bu = base up; BD = base down; bi = base in (toward the wearer’s nose); BO = base out (toward the wearer’s ear).
How they are measured
Vol intensity, cylinder intensity, and power additions are always indicated on the dioptric. They are in decimal form and are usually written in quarters of a bipolar degree (0, 25 g).
Ash values are whole numbers from 1 to 180 and indicate only meridian position, not intensity.
When prismadioprises are shown in decimal form, only one digit is allowed after the point (e.g., 0, 5).
An example eye prescription chart
Still confused? Let’s look at an example prescription chart:
| sph | cil | ash | Add | Prism | |
|---|---|---|---|---|---|
| OD | -2.00 | sph | +2.00 | 0, 5 bd | |
| OS | -1. 00 sph | -0. 50 sph+2. 00 | 180 | +2.00 | 0, 5 boo. |
In the right eye (OD), the primary physician declared
-2, 00 D Area for correction of myopia.
No cylinder or axle strength. In other words, no astigmatism. This doctor decided to make “SPH” to indicate that only spherical strength is prescribed for the beat eye. Some physicians add “DS” to the “diopter sphere” while others leave it empty.
The left eye (OS) was assigned.
-1, 00 d Area to approach correction.
-0, 50 d Cylinder for astigmatism correction.
180 Power cylinder with meridian axle. This means that the horizontal (180 degree) meridian of the eye cannot get extra power for astigmatism, but the vertical (90 degree) meridian gets an extr a-0, 50 d from the cylinder column.
Both puri are assigned:
“+2, 00 d Added for PresbyopieceRection.
Prismatic correction 0, 5 Prima dioptric in both eyes. In the right eye, there is a prismatic base (BD). In the left eye, the base (boo).
Your most important doctor still has the opportunity to give you specific advice about the lenses of your spectacles prescription He or she can probably imagine lace-coated, photochromic glasses, and/or multifocal glasses, which can provide the best possible vision correction.
Can eyeglass prescriptions Will this be used to purchase contact lenses?
No, you cannot use your own glasses to purchase contact lenses. prescription Purchase contact lenses.
An eyeglass prescription It only works for the purchase of eyeglasses. It does not contain specific information, including important information about contact lenses. prescription .
This information can only be obtained with the help of contact lenses. This is an additional step that can be performed during a visit to the ophthalmologist.
Spectacle lenses are located at a distance from the eye and contact lenses are located directly on the eye. This distance affects the strength of the lenses needed to allow the eye to focus properly.
In addition to the information on the spectacle prescription , a contact lens prescription the front (center) curve of the rear area of the contact lens, the lens drainage, and the specific manufacturer and brand name of the lens should be indicated.
Additionally, the strength of the spectacles is prescription often the role in determining the best strength of the contact lenses. This is because spectacle lenses are placed at a specific distance from the surface of the eye (usually within 12 millimeters) and the contact lens is exactly on the cornea of the eye.
Accurate Contact Lenses prescription Contact lenses can only be made after they have been fitted and the prescribing physician has evaluated the eye’s response to the lenses and to contact lenses in general.
Your eyeglass prescription is yours to keep
The Federal Trade Commission (FTC) is considered America’s consumer protection agency. Their prescription states that ophthalmologists should give patients a copy of their glasses prescription at the end of the eye measurement by refraction.
The prescription is pre-determined to take into account the “tolerance” of the glasses. prescription So that you are free to purchase glasses from the supplier of your choice.
Your doctor is obligated to give you a copy whether you ask for it or not. the prescription Whether you ask for it or not. Your eye doctor may not be able to support the release of your request. prescription Under your contract to purchase those glasses, you cannot be charged additional costs to you for releasing yours. prescription .
If you suspect that your doctor is not complying with this rule, you can report the case to the FTC.
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