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Sunglasses reviews, 20 samples

From the sun, but omit many other mandatory information and serve only to situations of low light intensity. Optical companies compete this summer with proposals for clothing designers, fashion brands and boutiques and accessories shops, which have their own line of sunglasses. In this context, some users take precedence this aesthetic and symbolism of sunglasses on his practical role: protecting our eyes to light radiation. European legislation considered sunglasses as protective equipment (PPE) and subjected to regulations establishing quality requirements to be met to incorporate the CE mark. A sunglasses should protect against the sun's harmful radiation without affecting the assessment of color and contrast of the image by the user.

The key to success criteria in the selection of sunglasses is the use to which it is to be assigned. And the factors that determine what are the protective filter on the lens and related to light intensity and type of radiation delivered to the user's eyes. Other elements of decision (apart from the aesthetic, subjective) are the design of the mount, which has to be small (involving small lenses) or be removed from the face, since it would increase the absorption of ultraviolet radiation added that from the sides. But there are other issues that define the quality of sunglasses, as the strength of the mount, its design or materials of the frame.

The core functions of these glasses are partially absorb the light intensity, protect against ultraviolet radiation and reduce the effect of glare. These are some of the variables studied by consumption in their analysis of 20 sunglasses, optical acquired stores and boutiques of clothing and accessories. The price difference between the samples was enormous. The cheaper models were Base (1,500 pesetas), Springfield (2490 pesetas), Jack (2780 pesetas), Fosco and Accesories ZA (3995 pesetas), acquired five stores clothing and accessories. The most expensive: Oakley (27 700 pesetas), Gucci (24,500 pesetas) and Giorgio Armani (20 020 pesetas). The average cost was 11,000 pesetas. Neklot, MS Basic F, West, SunGeart Sport, Massimo Dutti, Dirty Dog and Police cost less than average models Persol, Carrera, Ray Ban, Diesel and Eassun are above the 11,000 pesetas.

We compared the technical information provided by their labels to the consumer, the quality of vision they offer, they get protection against solar radiation, the state of the lens and its resistance to flammability, radiation, accidental drops, bumps and chafing. The rule, as developed, includes a series of peaks and troughs binding on the glasses can incorporate the CE, which all show wear.

Buying quality shades

All meet the technical requirements established by the EU standard for sunglasses, but only 15% of these glasses incorporate security (not mandatory) and 55% missing required information and useful to the consumer. Only Ray Ban, Persol, Dirty Dog, Oakley and Giorgio Armani were correct information in Oakley and Armani but there were discrepancies between the declared and specific filter in the laboratory. The regulation establishes five categories of filters according to the percentage of light that transmits the lens. Eleven of the twenty had a filter 3, a high protection to strong light situations, like the sun on the beach at noon. There was also lens category 1 (minimal protection for seminublados days), 2 (soft sunlight) and 4 (maximum protection, ski, mountain, sea ...), but none of the category 0 (interior and cloud cover).

The transmission in the ultraviolet, both in the full range, as UVA and UVB rays was very low in all cases according to legal guidelines. Oakley was the most dampens the transmission of visible radiation (6%), unlike Fosco (71%). Ten exceeded one in the infrared transmission of 80%, less relevant to our view as to its origin from the sun. Fosco base and provided the least protection from sun glare blue and the greater Springfield. The point is that all lenses analyzed qualify to the standard required. If you want some cheap sunglasses and soft solar luminosity, the option is Base (apologize if you fail to provide information to consumers), which costs £ 1500. If we want to average brightness and with all the required information, a good alternative is MS F Basic, £ 5,400. And to strong sunlight (without information), West (5,500 pesetas). All this, naturally, taking into account only studied and leaving aside the quality of the frame and aesthetic appreciation.

On the other hand, the quality of vision sunglasses depends partly on color fidelity or absence of distortion in the perception of colors. Was correct in all samples, and only Springfield approaches, without exceeding, the limit of visual mitigation for the green, it is important to distinguish green traffic lights. In addition, sunglasses for sighted users have to be optically neutral, should not be graded. Jack introduced a small optical power (+0.12), but less than that permitted. Moreover, bubbles, streaks, scratches and other defects in the body or on the surface of the lens affecting the quality of vision. In the analysis only superficial cracks were detected in one of two five-lens glasses.

The rule also establishes minimum parameters of mechanical strength and impact, as well as flammability and radiation, which will determine the durability and aging of glasses. All samples showed a satisfactory performance in this important resource. Most lenses were green, which is considered optimal because of its color fidelity and performance in high brightness environments. Therefore, it can be concluded that the 20 studied sunglasses fulfill their mission and quality standards that the law provides and will be the use to which he intends to allocate, price and unstudied aspects (materials for the frame , quality of design ...) and other more subjective (related to looks and fashion) which, logically, will tip the balance in favor of one or another.

Sunlight, radiation and sunglasses

From the sun we get three types of radiation (the rest are absorbed mostly by the Earth's atmosphere): UV visible spectrum and infrared rays. The visible spectrum, or visible light or simply light, corresponds to the fraction of solar radiation (380-780 namómetros) that are detected and interpreted by our eyes. The different colors (red, orange, yellow, green, blue, indigo and violet), each corresponding to a type of visible radiation (of a different wavelength), and the sum of which gives rise to the white light. Every object on earth absorbs some of the visible radiation reaching it, and partly reflects this part determines the color reflected, as we perceive it.

The light radiation can have harmful effects on our skin and eyes. Thus, ultraviolet (UV) into perspective are beneficial to health, especially UVA effects on calcium absorption or aesthetic applications. In contrast, the UVB and UVC are harmful and can cause skin conditions, keratitis, conjunctivitis or even cataracts. The ozone layer in the stratosphere protects against this type of radiation, but in recent years scientists have observed a variation in thickness of this layer, indicating a decrease in the protective effect. As for the visible light intensity decreases over the comfort of vision. The blue light of shorter wavelength and thus higher energy, can cause glare if it is very intense, reducing the ability to distinguish colors and contrasts. Under certain circumstances, the glare is increased by multiplier effects of light by reflection, as in high mountains, snow, sea ... In addition, intense visible radiation is usually accompanied also ultraviolet and infrared radiation, with consequent negative effects. Just because a lens color and light intensity decreases. However, a sunglass that, because of his color, only less intense visible light without protecting against UV is more dangerous than nothing at all: the pupil, which dilates and contracts as a defense mechanism against light intensity excessive, delayed, duped by the "protection" of the lens, giving way to more UV radiation.

For their part, infrared (IR), can damage the cornea and conjunctiva, by thermal effect. They may also damage the lens, causing cataracts or visual disturbances in the retina. However, its effect on vision is less than in the case of UV radiation. The choice of sunglasses should come mainly determined by the use to which it is to be assigned. For this there are several basic factors to consider, such as the filter type (see Table I), or the color of the glass, which affect the luminosity and type of radiation that we will come. Other selection criteria affecting the design of the frame, apart from the purely aesthetic: it should not be too small (to involve small lenses), or should be removed from the face, as this would allow greater absorption of ultraviolet radiation , from the sides.

Needs of the new consumer

Make a purchase once every 20 days, freeze, request the service at home, order pizza on Friday night and buy all the clothes and decorative items in a shopping center, are some of the features that characterize consumer today and that will accentuate As we move into the new century. Make a purchase once every 20 days, freeze, request the service at home, order pizza on Friday night and buy all the clothes and decorative items in a shopping center, are some of the features that characterize consumer today and that will accentuate As we move into the new century.

And food consumption

Today's families, according to a survey by the National Consumer Institute, spending less time on the purchase and preparation of meals, but value natural products and, occasionally, perform diets. This new way of eating means that weekends are used for the recovery of traditional gastronomy, while you prefer working on a easy meal preparation. Hence the increase in ready meals, home services, and the demand for food "portable" and packaged in smaller portions and recyclable and environmentally friendly. All of these changes is determined by the workplace. So those same foods must be "smart" with the nutritional benefits your body needs and can not be taken naturally.

Fashion & design

The changes also come to the dress. Comfortable clothing, fashion and design are the requirements for current, to the detriment of quality. We buy them in schools where we find everything in one space. The comfort extends not only to garments made, if not the actual buying activity.

Less time to buy, more to travel

If the working life brand new eating habits, also determines how to buy and the places where we go. Thus the young use the Internet and telephone to make their purchases, while the more traditional they will go to malls and major distribution centers, while using the transport service of home shopping. All the time not engaged in the purchase can be reversed in leisure and travel, the main objectives of the new consumers. In this way, down the budget devoted to food and increasing the budget for travel and leisure. It also eliminates the idea of a unique holiday in the summer. Instead, the trips are scheduled throughout the year, so that holidays are taken more installments and over 12 months, as a way to capture the different seasons.
The fashion for second-hand clothes

These establishments usually only accept clothing in perfect condition

In a time now have begun to proliferate in large cities such establishments that offer second hand clothes even more affordable than traditional stores. Of course, there clothes exposed has the obvious disadvantage of being used and, whether aesthetic, hygienic or social, that hinders their acquisition. Anyway thinking about balance our family budget does not have to consider the option of buying only clothes in these stores, it is also plausible that we can get us some euros by getting rid of clothing ourselves that and not to use or simply want to ignore.

The cleanliness and condition of the garments are two essential features when buying something. In your position as a purchaser you never forget that you are entitled to claim as in any other establishment. These establishments usually only accept clothing in perfect condition, and hygienic criteria, having passed through the dry cleaners. The seller can set the price, but the owner of the property reserves the right to refuse the garment if it considers it expensive, but is in perfect condition. The percentage of the gain is commonly set as follows: the seller will receive approximately two thirds of the sales price and the rest will go to the grocer.