A quality ophthalmic lens is of paramount importance to provide maximum clarity of vision. At TONI&GUY Opticians we only prepare your glasses with premium quality lenses supplied by the global leaders in ophthalmic products Zeiss.
Traditionally, spectacle lenses were made of glass but most lenses are now lightweight plastic however Mineral (glass) lenses are still available for extremly high prescriptions when glass can be the best option. There is a wide range of materials available to suit your prescription and lifestyle.
Concave lenses are used to correct short sight and convex lenses to correct long sight. Concave lenses are generally thinner in the centre than they are at the edge and convex lenses are usually thinner at the edge than at the centre.
The curvature of the lens, its thickness and weight will depend on the amount of long or short sight it is designed to correct. The lens material will also influence the thickness and weight of your lenses, as will the size and shape of the spectacle frame that you choose. Basically, the higher the refractive index (the number after each lens type) the thinner the lens will be. This is because materials that bend light more than others have a higher refractive index and hence a shorter or longer ‘Focal Length’. This means that the same correction and focal length can be achieved from less lens material making them thinner and lighter.
We do advise that if you have a high prescription you consider a high index lens because they will be thinner and lighter and reduce eye magnification.
Lenses come in many types and at first, things can become a little confusing. But don’t worry. We’ll explain your options in detail so that you can understand and choose the best lenses for you.
Standard Lenses 1.5
Our standard lenses which are currenty FREE with all our prescription eyewear are plastic and suitable for general purpose. Prescriptions with powers stronger than +3.00 may start to look thicker in the middle and powers stonger than -3.00 may start to look thicker on the edges with these lenses.
Polycarbonate lenses are thinner and lighter than the standard lenses making them an ideal choice to compliment lightweight or titanium glasses. Polycarbonate lenses are made from a similar material to that of bulletproof glass and are 12 times more impact resistant than standard plastic lenses. We stongly recommend you opt for these lenses or the extra thin 1.67 lenses if you want rimless or semi-rimless (supra) frames.
This material also has a kind of "softness" which gives polycarbonate lenses an ability to absorb energy without breaking, making them an excellent choice for sports eyewear because these are less likely to fracture than regular plastic lenses.
These lenses are up to 30% thinner and lighter in comparison with standard lenses as well as incorporating anti-reflective coating, UV400 treatment and scratch resistance as standard. These lenses will also improve the overall aesthetics of your glasses if you are going for a larger frame size. Our thin 1.6 lenses are generally recommended for prescriptions up to +5.00 or -5.00.
Extra Thin 1.67
These lenses are made using the most up to date manufacturing facilities in the world and offer excellent value for money. They are extremely light and thin and come with an anti-reflective coating, UV400 treatment and scratch resistance as standard.I f you have a medium to high prescription, you'll find our extra thin 1.67 lenses thinner and flatter than conventional plastic lenses by up to 40%.
Ultra Thin 1.74
If you are a mid to high prescription wearer you'll no longer have to suffer the dreaded magnified or minified eye look that has put you off wearing spectacles in the past. Our ultra thin 1.74 lenses are the thinnest spectacle lens available in plastic and the flattest lens available on the market today. These 1.74 lenses are an incredible 50% thinner than a standard plastic lens and three times lighter than glass. Our optimum 1.74 lenses come with an anti-reflective coating, UV400 treatment and scratch resistance as standard.
Anti-reflection coating (MAR)
Spectacle lenses can be provided with anti-reflection coatings which virtually eliminate distracting reflections from the surfaces of the lens. Reducing reflected light is particularly helpful for computer users and for night driving. Anti-reflection coatings also improve the cosmetic appearance of your glasses and can make thick lenses look thinner.
Scratch-resistant / hard coating
Plastic lenses are lighter than traditional glass lenses but they scratch more easily. Scratched lenses can be irritating for the wearer and look unsightly. Scratch-resistant coatings are available to protect against damage and prolong lens life.
Polarized lenses contain a special filter that blocks intense reflected light, reducing glare and improving comfort and visibility. Outdoor enthusiasts who benefit the most from polarized sunglasses include skiers, bikers, golfers and joggers, anglers, water sporters all who may enjoy a clearer view along with elimination of glare.
Polarized lenses reduce glare and give colours a more vibrant look.
Left: Non-Polarized Lens Right: Polarized Lens
These sunglasses can be used for driving and, in fact, can reduce glare from a long, flat surface such as the hood of the car or the road's surface. Polarized sunglasses also can be worn indoors by light-sensitive people, including post-cataract surgery patients and those continually exposed to bright light through windows.
Photochromic lenses (often called Transitions or Reactolite) are clear (or nearly clear) indoors and darken automatically in response to sunlight outdoors. They also protect your eyes from 100% of the sun's harmful ultraviolet radiation.
These features make photochromic lenses a great convenience, because they reduce your need to wear prescription sunglasses in most outdoor conditions.
Sunglass tints are a popular choice on prescription lenses allowing you to see clearly in bright sunlight. They protect light-sensitive eyes and can soften harsh, bright light to relieve eye strain. All of our tinted lenses are 100% UV protected. Our standard tints are: Brown, Grey, Dark Green (G15)