Visiofactory uses cookies to improve your experience on our online shop.
By continuing your navigation on our site, you accept the use of these cookies. More informations.
15% discount on your complete optical equipment - CODE AUTOMNE15

Know how to read and understand your prescription with Visiofactory opticians

Difficult to see clearly between the complex language of the "optical" world and the prescription left by your ophthalmologist. Do not panic, here we take the basics and we tell you everything.

1. HOW IT WORKS ? 

The light of an object that propagates in a "healthy" eye enters into it and focuses at one point to recreate the image at the level of the retina.Comprendre l'oeil

2. POINT ON MY EYES 

70% 70% of French people have visual problems.
Myopia, farsightedness, astigmatism or presbitia ... What are "suffering" our eyes?.

Myopia
Myopie

WHAT IS IT ?

A bad long distance vision


The image of a distant object is formed in front of the retina and the vision in the distance is blurred.

Myopie
Hyperopia
Hypermétropie

WHAT IS IT ?

A bad near vision


The image of a distant object is formed behind the retina and near vision is blurred.

Hypermétropie
Astigmatism
Astigmatisme

WHAT IS IT ?

An imprecise vision


The curvature defects of the cornea produce two superimposed images for the same object and induce blurred vision from near and far. Astigmatism is associated with myopia and / or hyperopia.

Astigmatisme
Presbyopia
Presbytie

WHAT IS IT ?

A bad near vision


Natural phenomenon of the lens which loses its flexibility. Close-up vision becomes difficult, even for someone who sees perfectly well from a distance.

Presbytie
 

3. CORRECTION THE POINT ON MY ORDER

Now that the different cases have been identified, we can move on and decrypt together the order in all its possible forms of writing. But first, a little vocabulary!

Sphere

The sphere is the power add to correct myopia, hyperopia or astigmatism.

Addition

This is the prescribed value for progressive presbyopic lenses. Always identical for both eyes, it refers to the power to add to vision from a distance to get near vision.

Cylinder

The cylinder is a parameter allowing the treatment of astigmatism. The value is followed by an axis expressed in degree (0 ° to 180 °) positive or negative..

Axis

Expressed in degrees, it indicates the direction of the astigmatism to be corrected.

focus
on writings

Unique value

My prescription contains a unique value next to "right eye" (OD) or "left eye" (OG):

This is a simple myopia (if this figure - which corresponds to the sphere - is negative) or simple hyperopia if the number has a positive value.

Several values

If I read several values ​​next to "right eye" or "left eye":

I "suffer" from myopia or hyperopia with astigmatism. The value in brackets is the cylinder and ALWAYS matches the axis in degrees. The writing may be different depending on the ophthalmologist but the correction is exactly THE SAME.

If the order contains the mention "Addition" usually written "ADD" in addition to the values ​​quoted above:

Your ophthalmologist has prescribed glasses called "progressive" to correct your presbyopia.

Did you know

Ophthalmologists have become accustomed to writing the value of the cylinder in negative (here -1.00) whereas the manufacturers or opticians resonate with a positive cylinder and thus transpose the formula:

The same correction can be written in two different ways.
How to translate your prescription:

  • Add the sphere and the cylinder to get the "new" sphere: (0.75 - 1.00 = -0.25)
    New sphere = -0.25
  • We modify the sign of the cylinder by reversing its power: + becomes - and conversely (-1.00 = +1.00)
    New cylinder = +1.00
  • The axis is modified by 90 ° while keeping a value between 0 ° and 180 ° (10 ° + 90 ° = 100 °)
    New axis = 100 °
  • Old values ​​are replaced by new ones
    (100 + 1.00) - 0.25

If you still have a doubt, just check the following box in our optical module

and we will complete the file for you!

 

Fast worldwide DELIVERY

RETURN

within 30 days

SECURE PAYMENT

3D Secure | Paypal

French glassmaker

BBGR - Essilor Group

ITEMS

guarantee