What are the signs of astigmatism?

In near and distance vision, the contours of objects and lines (vertical, horizontal and oblique) are slightly blurred
or unclear.
Difficulty in perceiving low-contrast elements
Confusion about similar letters and numbers

Sensitivity to light, glare
Visual fatigue, frequent headaches, tingling of the eyes
Tendency to squint

What is astigmatism?

The most common visual defect after myopia.
It is caused by a deformation or irregularity of the cornea, the transparent part at the front of the eyeball.
These irregular shapes prevent light rays from converging on a single point at the back of the eye on the retina to form a single sharp image.

Why do I have astigmatism?

Astigmatism is usually present in childhood and changes little over the course of a lifetime.

It can be caused by an injury to the cornea following an accident or as a result of a healing process after an infection or corneal transplant.

Astigmatism can also be related to keratoconus, an eye disease that progressively deforms the cornea.

What are the different degrees of astigmatism?

On a spectacle prescription, astigmatism is expressed by a number, a power in brackets, which is expressed in dioptres, followed by a degree. The diopter refers to the power of the astigmatism, the degree refers to its axis, i.e. its orientation.

For example, OD - 3.00 (- 2) 90° indicates for the right eye :

Myopia of 3 dioptres.
Astigmatism of 2 dioptres at 90 degrees.

Astigmatism can be weak, medium or strong:

Astigmatism is weak between 0 and 1 diopter.
Astigmatism is medium between 1 and 2 dioptres.
Astigmatism is strong above 2 dioptres.

Finally, astigmatism can go hand in hand with one or more other visual defects: myopia, hyperopia and presbyopia.

How to correct astigmatism?

Astigmatism is most often detected and measured during a basic eye examination. It can be corrected with glasses with toric lenses.

Your optician will help you choose the best corrective lenses for your lifestyle. Do you spend a lot of time in front of your screens? To avoid eye strain and filter out some of the blue-violet light, you can opt for our Eyezen® lenses. Designed for the connected life, they offer you better visual comfort, especially for close-up vision.