Spectacle Lenses

Published on
December 4, 2023
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Majority of our spectacle lenses are manufactured by Zeiss, the world leading optical lens and device company. Zeiss has a long history of expertise in precision optics. They use advanced technologies and manufacturing processes to ensure the highest level of optical accuracy and clarity. They invest in research and development to introduce new technologies that improve lens performance. This includes advancements in materials, coatings, and lens designs. Zeiss is known for rigorous quality control measures. Each lens undergoes thorough testing to ensure it meets the highest standards for optical performance. This commitment to quality contributes to the reputation of Zeiss lenses.

To see how these lenses are made, view the video here.

Lens Types

Single Vision Lenses

Single vision lenses are the most commonly prescribed type of vision correction in spectacles. These have the same focal power over the whole lens and can be used to correct a variety of vision problems, including myopia and hyperopia. Some of the more sophisticated Perfection single vision lenses are particularly accurate, with 10,000 control points on the lens during manufacturing.

Progressive Lenses

Progressive lenses allow you to see near, intermediate and long distances without needing to change spectacle. The top area of the lens is used for distance vision and the bottom area is used for close vision, while the middle area issued for intermediate viewing. As there is no visible line separating the different areas, these lenses are the most cosmetically appealing. The field of view in a progressive lens is narrower than in a single vision lens or bifocal, and there is some blur outside of the central corridor of the lens. Most patients adapt to this very well after a few weeks by learning to move their eyes and head together to keep their gaze through the ‘sweet spot’ of the lens.

Occupational Lenses

Occupationals or computer lenses, solve the problem of a pair of reading glasses not providing clear vision on computers and intermediate objects. Because of this, some optometrists refer to them as the modern-day reading glasses. Occuptionals are a variety of progressive lens designed to give a wider field of view for intermediate and near focuses. These lenses do not provide clear vision for distance but are great for anyone in an office environment, as the top of the lens gives a customised focus for distances further away than your habitual reading point.

Lens Coatings

Your glasses are constantly exposed to conditions causing wear and tear. A scratch resistant coating helps to improve the durability of the lens, helping your lenses to last longer. Zeiss offers many lens coatings for this purpose.

DuraVision Platinum Coating

The Duravision Platinum coating from Zeiss provides greater clarity with reduced reflections, clearer vision, and durability for better damage resistance. It also provides 100% UV protection.

BluePro Coating

Blue-light emanates from LED screens in technology that we use every day - phones, tablets, computers and televisions. Satin Blue protects your eyes by selectively filtering blue light, to comfort your eyes whilst looking at a screen and still providing excellent clarity. BluePro lenses are scratch resistant, smudge and water resistant and dust repellent, ideal for everyday use, no matter what environment you are in.

Tinted lenses

All types of lenses, including multifocals, can be permanently tinted to provide glare protection when in the sun. Driving and water sports especially can be improved with the use of polarised sunglass lenses. These eliminate unwanted reflections from road surfaces and water. To give more functionality to your normal spectacles you can choose to have them made with a photochromatic lens. These are activated by UV light, darkening when outside and lightening to a completely clear lens inside. This process often takes less than a minute, making them suitable for full-time wear without having to worry about carrying an extra pair of sunglasses.

Refractive index

The refractive index helps to reduce the volume of the lens material, resulting in a thinner lens. The higher the refractive index, the denser the plastic. Depending on your spectacle script and frame selection, you may want to consider a higher index in order to make your lenses feel more comfortable, more durable and thinner. Ask our friendly staff about the refractive index.

If you wear a minus lens (for near-sightedness), your lens will be concave in shape – thinner at the middle and thicker at the edges. The edge thickness can be reduced with a higher refractive index. With a plus lens (for farsightedness) the lens shape is convex – thinner at the edges and thicker at the centre. The central thickness will be reduced as the refractive index increases.

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