With four different classes of quality and performance available – Spherical, Aspheric, Optimal and Individual – you can be sure of finding the best single-vision product to meet your vision needs, whether for distance vision or reading. Each performance tier includes all the benefits of the preceding one.
Quality class 1: Spherical – the traditional lens
This performance tier comprises single-vision lenses with a spherical lens design which are a popular choice for single-vision reading glasses. ZEISS introduced the first spherical lenses with a design known as point focal imagery – ZEISS Punktal® – in 1912. Available in both plastic and glass, they can be used for both strong and weak prescriptions. The optimized lens surface ensures precise imagery – so even at this basic level of quality you can be sure of enjoying outstanding vision.
Plastic single-vision lenses are the perfect way of achieving comfortable vision for people with the low-prescription powers typical of reading glasses. Plastic single-vision lenses are therefore particularly suitable for mild to moderate myopia (nearsightedness) and mild hyperopia (farsightedness). Offering perfect vision, these spherical single-vision lenses have been designed to minimize peripheral blur. Wearers also benefit from modern manufacturing methods which have made these lenses exceptionally lightweight. Plastic single-vision lenses can reduce the weight of glasses by up to 40 percent when compared to glass lenses. Plastic lenses are also highly resistant to breakage, which makes them the perfect choice for children and sporting activities.
For people who are very nearsighted, however, single-vision lenses made from glass are still the best choice. Depending on the refractive index required, it's now possible to produce extremely thin and esthetically appealing lenses even for strong prescriptions. In addition, an anti-reflective coating significantly reduces the unsightly “power rings” that occur with high refractive indices, making the wearer's eyes look much more natural. Careful selection of the right frame size and shape also has an impact on the subsequent lens thickness and thus on the overall weight of the glasses. As always, the best approach is to seek expert advice from your eye care professional.
Quality class 2: Aspheric – a good choice if you are farsighted
Single-vision lenses within this performance tier have an aspheric design and are most suitable for lenses in the plus range, in other words for glasses wearers who are farsighted. The advantage they have over the spherical performance design is that aspheric lenses are typically up to 20 percent lighter and thinner than their spherical counterparts with the same power and have a significantly flatter front curvature, while always maintaining the same outstanding visual performance. The result is that the wearer's eyes are less magnified than with conventional lenses. Aspheric single-vision lenses are a good choice for eyeglass wearers with strong prescriptions who are looking for visually appealing glasses that offer superb vision.
Quality class 3: Point-by-point optimization with freeform technology
Clarity that will astound you! Single-vision lenses in this performance tier are produced with cutting-edge ZEISS freeform technology, achieving even greater visual comfort across the entire surface of the lens and virtually eliminating the distortions at the lens periphery that are found in conventional single-vision lenses. Single-vision lenses in this quality class take more aspects of the individual wearer’s prescription into account in the production process including sphere, cylinder, axis, prism and prism base. The lens design is extremely thin and flat, and everything appears clearer and more natural. Learn more about ZEISS freeform technology
Quality class 4: As unique as a fingerprint – the top of the range
If you are looking for the very best, then this performance tier is for you! Single-vision lenses in quality class 4 offer the ultimate experience for your eyes. Incorporating all the data measured by your eye care professional and using cutting-edge production methods, these lenses offer superb visual clarity in all directions right to the edge of the lens – even with strong prescriptions. At the same time, these highly individualized lenses ensure extraordinarily high wearer tolerance, even with high cylinders and prismatic prescriptions. This performance tier is particularly recommended for wearers with a condition known as associated heterophoria, which requires the use of a prismatic power. This quality class offers the ultimate in lens individualization.
Don't forget: ZEISS plastic lenses in all four quality and performance tiers always come with a hard coating to ensure that you can enjoy perfect vision through scratch-free lenses for a long time to come! In addition, both our plastic and glass single-vision lenses are available with the option of i.Scription® technology which offers better night vision, enhanced contrast and richer colors! Please consult your optician for more details. Learn more…