Page 7 - Tips

Persol is a luxury brand specialising in the production of Sunglasses and ophthalmic frames. The name Persol is derived from the Italian per il sole meaning ‘for the sun’ and it is one of the oldest eyewear companies in the world. In 1917 Giuseppe Ratti, photographer and owner of the Berry optical, started producing his first glasses and lenses for athletes and aviators who required comfort, protection and optimum vision. Persol was a heavy influence in the production of sunglasses. The company developed the first flexible stem, known as the patented Meflecto system, which was one of the first spring hinges ever developed for eyewear. Persol was introduced to the United States in 1962 and opened its first boutique on Rodeo Drive in Beverly Hills 1991. At the moment all plastic Persol spectacles are made in Italy using Cellulose acetate which is a hypoallergenic material derived from cotton. The lenses for the sunglasses manufactured by Persol use a crystal lens to filter harmful light from

Transitions glasses have some great benefits, particularly when wearing them as everyday spectacles. The photochromic lenses in the glasses darken as they are exposed to the ultraviolet rays in daylight-but they have one significant disadvantage in that until now they have not been appropriate or beneficial for use as driving glasses. When wearing glasses for driving, you are typically trying to address two primary concerns (apart from the prescription eyeglass lenses remediating vision of course) – glare from either oncoming traffic, or reflections from road surfaces caused by moisture for example, and as prescription sunglasses that can attenuate or reduce the brightness of incoming sunlight. Modern windscreens, however, take away one of these benefits as they are designed to absorb the ultraviolet light that has been necessary to activate the photochromic reaction in the glasses lenses. Drivewear lenses resolve this conflict by using unique and patented dyes in the transitions lenses

Prescription Sunglasses Lenses Nowadays, with technology growing, you'll notice that sunglasses aren't just available with one standard prescription lens. They now come with a choice of superior polarised lenses. There are significant differences between the lenses. Some are obvious while others won't be noticeable until you have tried polarised lenses. When shopping for new prescription sunglasses, be sure to weigh up the pros and cons of both lenses. This will help you find the perfect sunglasses. The Difference Between Standard & Polarised Lenses Apart from being more expensive, polarised lenses differ from standard lenses in one main way. The vertical ‘polarisers’ block the transmission of horizontal light through the lenses, dramatically reducing glare. Glare can hit your eyes from the road, the bonnet or windscreen of a car, water surfaces, and any other horizontal plane the sun can reflect off. The difference between the two lenses is very apparent when you hold them next to one

Both polycarbonate and Trivex lenses have properties which make them an ideal material for lenses where the wearer may require extra durability and protection for activities that they undertake. It’s recommended that such lens materials are used in glasses for sports goggles, sports glasses and certain safety glasses (used in industry). Indeed, they are suitable for practically all glasses frames where added lens safety is a requirement. Polycarbonate and Trivex lenses provide greater impact resistance than lenses made out of other materials. They are made out of softer plastic compounds which makes them less brittle than other lenses and, consequently, able to absorb impacts without cracking, fracturing or shattering. Both types of lenses are provided with a scratch-resistant coating which gives added protection from scrapes and scratches. Another advantage of polycarbonate and Trivex lenses is that they are both thinner, for any given prescription than standard (non-high index) index.