Have you ever felt puzzled by the terminology used by eye care professionals? Progressive lenses, single vi… what else? Don’t worry—we’re not here to confuse you further. Below, we explain the differences between these types of lenses and provide the information you need to make an informed choice that suits your needs.
Single Vision Lenses
Single vision lenses are the simplest and most common type. As their name suggests, they have a single prescription across the entire lens surface. Eye care professionals typically prescribe them to people under 40 who are only nearsighted (myopic) or only farsighted (hyperopic), as they need vision correction at just one distance.
Depending on the type of visual condition, single vision lenses are manufactured differently in optical shops and laboratories to provide the required correction:
- Myopia (Nearsightedness): These lenses are concave or diverging, thicker at the edges and thinner at the center, focusing light onto the retina rather than in front of it.
- Hyperopia (Farsightedness): These lenses are convex or converging, thinner at the edges and thicker at the center, focusing light directly onto the retina.
- Astigmatism: These lenses are cylindrical, curved on one surface and flat on the other, correcting distortion caused by an irregularly shaped cornea.
Benefit: Because they have only one prescription, adaptation to single vision lenses is usually immediate, especially for people who are not used to wearing glasses.
Bifocal Lenses
Bifocal lenses are designed for people who need vision correction for both near and distance vision. These lenses have two distinct prescription areas: the upper portion for distance vision and the lower portion for near vision.
Bifocal Lenses: How do they work?
- Distance Vision: The upper half of the lens is designed to clearly see distant objects, which is essential for activities such as driving.
- Near Vision: The lower half of the lens is intended for near vision, ideal for reading or working on a computer.
Benefit: Bifocal lenses allow quick and easy switching between the two distances, eliminating the need to carry a second pair of glasses.
Progressive Lenses
Progressive lenses, also known as multifocal lenses, are an advanced option that provides a smooth and continuous transition between different prescriptions without visible lines. These lenses are ideal for people with presbyopia, as they allow clear vision at all distances: far, near, and intermediate.
Progressive lenses: How do they work?
- Distance Vision: The upper part of the lens is used for viewing distant objects.
- Intermediate Vision: The middle area of the lens provides correction for intermediate distances, such as working on a computer.
- Near Vision: The lower part of the lens is for near vision, ideal for reading or performing close-up tasks.
Benefit: Progressive lenses eliminate the need to switch between different pairs of glasses, offering a comprehensive solution in a single pair of eyewear.
Choosing the Right Lenses for Your Needs
The choice between single vision, bifocal, and progressive lenses depends on your specific visual needs and personal preferences. If you need correction for only one visual issue, monofocal lenses may be enough. If you experience difficulties with both near and distance vision, bifocal lenses can be a good option. On the other hand, if you are looking for a versatile and aesthetically pleasing solution without visible lines, progressive lenses are ideal.
To determine which type of lens best suits your needs, it is important to have an eye exam and consult with a trusted eye care professional.