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Lenses
There is now a wide variety of lenses available to choose from to suit all requirements and prescriptions. As well as the normal single vision, bifocal and varifocal lenses, there are now lenses designed for specific tasks like computing and many different materials which will be suitable for different types of frames and prescriptions.
Plastic (CR39) Lenses
Traditional plastic lenses (called CR39) are much lighter than glass lenses and safer in the event of breakage. They can be tinted almost any colour and darkness and can also be treated to reduce scratching.
Hi Index Lenses
These are newer plastic materials that are denser (higher index) than traditional CR39 above. The end result is that the lenses can be made thinner and lighter. They can still be tinted, they absorb the UV light and come already treated to reduce scratching.
Aspheric Lenses
The aspheric lens is actually a lens design that can be used in most lens materials. It is a way of shaping the lens to create a flatter, thinner and less distorted lens than traditional designs, allowing lighter and far more cosmetically appealing lenses which can be used in modern designer frames for most prescriptions.
Photochromic Lenses
These are lenses which react to light, so that in dull conditions they have a soft neutral tint, and in bright light react with a tint appropriate to the intensity of the ambient light.
Reflection-free coating
Spectacle lenses can also be treated so they have reflection free surfaces, which virtually eliminate
distracting reflections, enabling people to have improved vision and they are visually more appealing.
Whichever glasses you choose, it is vital that you keep them clean. Use the appropriate cleaner for your
lenses and avoid putting them ‘face down’. If possible put them in their protective case
when you are not using them.
