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EN

YOUR VISION CORRECTION EXPLAINED

 

If you need glasses, you have an ametropia, an optical defect related to the shape of your eye. In other words, images are blurry because they do not focus properly on the retina. There are several types of ametropia: 

LONG-SIGHTEDNESS

Your eye is shorter than normal, meaning images focus behind the retina. The image perceived by the retina is not yet formed. Each point appears not as a point but rather a blurred spot. Long-sightedness involves difficulty seeing objects close up and some difficulty seeing objects far away depending on the degree of your ametropia. People with mild long-sightedness have a fairly flexible crystalline lens which still allows them to focus without needing glasses. They may be long-sighted without knowing it!

SHORT-SIGHTEDNESS

This ametropia makes it hard to see distant objects, but does not affect near vision. It is the most common visual defect and is the result of a longer eye than normal. Images are focused in front of the retina, so the points that make up an image are perceived by the retina as enlarged, like a "pixelated" image. This leads to blurry vision from a distance. Short-sightedness can be hereditary or environmental and affects men and women equally. 

ASTIGMATISM 

An abnormal curve of the cornea or crystalline lens leads to trouble focusing on both close and far objects. Instead of a spherical shape (like a soccer ball), the cornea or crystalline has a toric shape (like a rugby ball). Vertical lines, for example, will be perceived more clearly and sharper than horizontal lines. When astigmatism is not corrected, it can cause confusion between letters, difficult learning to read among children and, in general, symptoms such as eye fatigue and headaches.

PRESBYOPIA

This is not really an ametropia, but rather a natural phenomenon that affects everyone. Over time, the crystalline lens loses its elasticity and can no longer focus on objects close up. This starts happening from the age of 40/45 onwards and is commonly seen by the need to hold a newspaper further away to read it. Presbyopia stabilises around the age of 60.

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