How to correct vision defects with single-vision glasses
Today, more than 50% of people need glasses or contact lenses to correct their vision. This is not a positive figure, especially considering that eyesight problems are appearing at an increasingly younger age.
Overexposure to LED light from computer, mobile and tablet screens plays a major role in this situation. But luckily, the most frequent vision problems can be solved with the right single-vision glasses.
Single-vision glasses have the same prescription across the entire lens surface. They are designed to correct a specific visual defect. Which problems are these?
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Myopia (short-sightedness)
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Hypermetropia (long-sightedness)
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Astigmatism
We’ve all heard these terms before, but do you really know what they mean and how they are corrected? Let’s take a closer look.
Myopia
When, so to speak, the eye is too long or the cornea too curved, the rays of light converge before reaching the retina. This is what makes distant objects appear blurry. For this reason, people with myopia often squint to improve clarity. To correct myopia, concave lenses are used (thinner in the centre than at the edges). With high prescriptions, if the lenses are not adequately reduced, they can make the eyes look smaller.
HypermetropiaHypermetropia is the opposite of myopia: people with this condition struggle to see objects up close. It occurs when the eye is too short or the cornea too flat. Light rays enter through the pupil and focus behind the retina, making it difficult to see nearby objects clearly — for example, when reading. |
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It is corrected with convex lenses (thicker in the centre than at the edges). With stronger prescriptions, the eyes may appear larger behind the lenses, though this effect can be reduced with the right lens technology.
AstigmatismAstigmatism is the most common vision defect. It can occur on its own, although it often appears alongside hypermetropia or myopia. It is caused by an eye that is more oval-shaped than normal or by an irregular corneal curvature. As a result, light rays are focused on multiple points of the retina, producing distorted vision. Pure astigmatism is corrected with cylindrical lenses. If combined with myopia or hypermetropia, it is corrected with concave or convex lenses accordingly. |
If you suffer from any of these vision problems and need more information, you can contact us freely. Our team of opticians will be delighted to answer all your questions.