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RX Prescription Sunglasses

A Semi- Finished Blank Alutra Lens, before it has been processed

Bigatmo is the best choice for prescription Sunglasses and Eyewear.

The combination of active technologies and attention to detail make Bigatmo prescription lenses the right choice

These are some of the aspects that we have brought-together, in order to achieve this:

  • Bigatmo sun-lens research, development and environmental testing
  • The most advanced lens material currently available
  • Sophisticated, versatile, enhanced digital prescription lens designs
  • High definition digital freeform lens generation
  • Specialist glazing in our cutting-edge finishing lab
Clear and tinted prescription Bigatmo glasses

The importance of having the technology in the first 0.9mm of the lens.

Every pair of Bigatmo RX prescription sunglasses starts with a pair of semi finished lens-blanks. The front surface of the lens-blank is the finished part and carries all the sunlens filter technology in the first 0.9 mm. Your prescription is then generated and polished onto the back surface of the lens. This ensures that your prescription lenses have the same sun-filters as the plano (non-prescription lens), Alutra, Zeolite and Zeolite Polarized.

We also offer clear and Transitions prescription lenses: RX Prescription Lens Choices


Bigatmo Chromatic Aberration - NXT left, polycarbonate right

What makes the optical properties of NXT®/Trivex® exceptional?

Our lenses are cast from NXT®/Trivex® in glass moulds and cure very slowly in a temperature-controlled environment, resulting in very low internal stresses and excellent optical properties. Every lens material deforms slightly during the manufacturing process due to the pressure of the cutting tools on the lens surface, but NXT®/Trivex® has excellent mechanical properties with practically no deformation and this contributes to a more accurate prescription lens.

How your prescription is placed onto the lens.

Applying a prescription to a lens is a complex multi-stage process that takes place at our “finishing” labs using laser equipment for precision. This is when your prescription is “generated” and polished onto the back of the lenses, coatings are applied, the lenses cut and edged and finally fitted into your choice of frame.

High Definition Freeform Machinary

How RX lens design and manufacture improved recently.

Over recent years incredible advances have been made in the design and manufacture of prescription lenses. Until quite recently applying a prescription to a wrapped, curved lens was a tricky process which few labs tried and even fewer attained acceptable results. Digital lens generating and polishing technology changed all that, allowing different kinds of prescription to be placed on the back of the lens using computer controlled machinery.

A little while ago the best machinery would generate prescriptions using about 5,000 co-ordinates – now our lenses are prepared using in excess of 40,000. All Bigatmo’s RX prescription sunglasses – both single vision and progressive – are produced using the latest generation Digital systems.

A bit about Varifocal lenses.

In broad terms, the surface of a varifocal (or progressive) lens is divided into three areas. The top part is for viewing distant objects, the bottom part is for reading and close work and the part in-between handles the focal lengths between reading and distance – an instrument panel for example. The intermediate area is particularly important when driving or flying and so a lens which is natural to use is a real advantage. The idea is that the areas blend into each other thereby replicating natural vision.

What about lens design and why does it matter to me?

In order to take advantage of Digital lens design and NXT®/Trivex® technology, you also need excellent lens designs and you won’t be totally surprised to hear that there are companies that specialise in producing digital lens designs to suit individual lifestyles.

Natural varifocals with excellent intermediate vision.

We considered many lens designs and trialled the short list before choosing the most versatile options. Designed by people at the top of their field, they offer particularly versatile intermediate areas which make them a very usable design across a variety of activities.

Another reason for choosing these designs is that they’re quite easy to adapt to and our customers often tell us how natural they feel to use. We have very high success rates with this design but it’s worth remembering that, if you haven’t used varifocals before, some people have to persevere for a while until they get used to them. Think of this as your brain reading and understanding the new way data is presented by your eyes. Your brain is learning to use a new tool.

Eye tests, fittings and measurements.

To benefit from all this amazing technology, it is crucial to supply precise information. We prefer our customers to visit a good optometrist for a fresh eye test. The more precise and up to date your eye test is, the better and longer-lasting the lenses will be.

We also produce bespoke solutions. Varifocal sunglasses for glider pilots, for example, are quite different from the norm. Glider pilots need a larger area for distance vision and smaller areas for intermediate and near vision. This lens design has become our standard and a popular choice amongst the gliding community.

Like our glider pilot, if you want something different, special, or that you just can’t find in high street stores, please contact us to discuss your needs and how we might be able to help.