In the digital age, everything seems possible from a screen: shopping, consulting a doctor, taking a training course... or even testing your eyesight. Online vision tests have proliferated in recent years, promising a quick and free assessment of your visual acuity.

But how good are they really? Are they serious screening tools or mere marketing gimmicks? Here's a breakdown.

How do online vision tests work?

These tests generally take the form of simple visual exercises that can be performed directly from a computer or smartphone. They can include:

> Visual acuity tests (reading letters of decreasing size),
> Exercises to detect color blindness,
> Contrast vision or color perception assessments,
> astigmatism tests or light sensitivity tests.

In just a few minutes, the user receives a summary assessment of their vision, sometimes accompanied by recommendations.

Online Vision Test: Benefits, Accessibility, and Awareness

It would be unfair to dismiss these online tests. They offer certain advantages:

> Accessible 24/7 and free of charge, they allow everyone to ask questions about their vision, which is often neglected,
> Quick and simple, they can be a first step for those who are hesitant to consult a professional,
> Fun and educational, they raise awareness of the importance of visual health, particularly among young people and people who spend a lot of time in front of screens.

Online Vision Test: Limitations, a Non-Medical Setting

Despite these positive points, several serious limitations arise:

> No controlled environment: distance from the screen, lighting, display quality... all variables that are impossible to standardize at home.
> No medical analysis: No online test can replace a complete examination by an ophthalmologist or optometrist.
> Risk of false results: An online test can falsely reassure or, on the contrary, cause unnecessary concern.

Another point of attention: some platforms offer free tests with the aim of then selling glasses or contact lenses. It is important to keep a critical eye on these commercial practices.

Online vision tests are neither useless nor entirely reliable. They can serve as an awareness tool or as a first warning sign, but they are in no way a substitute for a professional eye exam.

If you experience visual discomfort, recurring headaches, or a decline in your vision, don't wait: consult an eye care professional. Only they can provide a complete and appropriate diagnosis.