Today, glasses are no longer just a vision correction tool. Manufacturers offer a wide range of additional functionality. Let’s discover together the types of lenses and their benefits. One of the most important factors is the material from which the lenses are made.
- Mineral glass: Although it offers excellent optical clarity, it is increasingly rarely used because of its high weight and fragility. This material is not recommended for children or athletes.
- Modern polymer materials: Polycarbonate and other impact-resistant materials are preferred because of their low weight and increased safety. Plastic lenses are twice as light as glass and safer on impact, but more susceptible to scratches.
Polycarbonate, originally used in the space industry, completely blocks UV rays without the need for an additional layer of protection. It is resistant to high temperatures and warping, retaining its properties even when left in a car exposed to the sun.
Optical design
Lenses can be:
- Spherical: Have a uniformly round surface.
- Aspheric: They have a thinner, close-to-flat shape, which reduces distortion at the edge of the lens and gives a natural look to the wearer’s eyes. They are ideal for people with large diopters, but their production is more complex and more expensive.
Aspherical lenses can create more intense reflections, which is why an anti-reflective coating is recommended. Multifocal lenses
These are ideal for people who need correction for more distances:
- Bifocal lens: Provides two focus zones – for distance and reading.
- Progressive lenses: allow a smooth transition between different focus zones, perfect for reading, computer work and driving.
A special category are office lenses, recommended for people over 40 who need clarity at close distances (phone, documents, keyboard). These lenses reduce eyestrain and increase productivity. Refractive index
Plastic lenses have a refractive index between 1.5 and 1.74. The higher the index, the thinner, lighter and stronger the lens. High index lenses are often aspheric in design, ideal for large diopters.
Special types of lenses and treatments
- Photochromic lenses: They change color depending on the light, providing protection against UV rays. They have a limited lifespan and require replacement after a few years.
- Polarized lenses: reduce horizontal reflections, providing increased clarity in bright light. Great for drivers, athletes and fishermen.
- Special coatings:
- Anti-scratch and anti-reflective coatings – improve clarity and reduce reflections.
- Hydrophobic coatings – prevents lenses from fogging.
- Antistatic layers – reduce dust build-up.
Sun lenses
Sun lenses offer UV protection and the color and darkness can be chosen according to your preferences. Our specialists can guide you in choosing the right lenses, taking into account your needs and lifestyle. Schedule a consultation for a personalized solution!
