What is Black Friday?

Black Friday is a shopping event associated with promotions and the start of the Christmas shopping season. It takes place on the Friday after Thanksgiving in the United States and has spread to online and physical stores in many countries. Fashion, footwear, sunglasses and accessories are among the categories shoppers explore during this period.

What does Black Friday mean for shoppers?

It is an opportunity to compare products and check the offers available from different brands. It does not mean that every item is discounted or that every store offers the same promotion. The products included, availability and conditions depend on each campaign, so the information on the store’s website is essential.

How do Black Friday promotions work?

Brands may organise promotions on the day itself or over a different period. Terms such as Black Week and Cyber Monday refer to related shopping campaigns, but do not guarantee a particular duration or discount. Read each offer’s conditions and check whether it applies to the product you want before completing your order.

How to choose what to buy

Start with a wishlist and a budget. Compare product features as well as the total price. For footwear, check the size and intended use; for sunglasses, review the measurements and lens information. Consider how the purchase will fit into your everyday life instead of choosing solely because of a promotion. Check shipping and return conditions too.

Discover Black Friday at D.Franklin

Explore the D.Franklin website to see Black Friday promotions and the products included. Our official channels provide information about each campaign. Save your favorites, review their details and base your decision on the current conditions shown online.

Who Invented Sunglasses?

Imagine walking down the street on a bright day, looking towards the sun without having to squint. Today, shielding your eyes from bright light is as simple as opening a case and putting on a pair of dark lenses. Yet this everyday gesture is the result of a fascinating evolution that began thousands of years ago for reasons unrelated to fashion or protection against ultraviolet rays. In fact, the first documented use of this accessory was intended to conceal human emotions in a place where truth was meant to be sacred. To discover which civilisation first began covering its eyes and how this invention reached us, read on. Who invented sunglasses, and what is their history? To answer the question of who invented sunglasses, we need to travel back in time, because there was no single creator, but several inventors throughout history. The concept emerged in two very different places and for entirely different reasons: The Inuit and snow blindness More than 2,000 years ago, Inuit people in the Arctic regions created the first forms of eye protection. They used wood, animal bones or walrus tusks rather than glass. They carved a very narrow slit in the centre to limit the amount of light entering the eyes. Their aim was to prevent the blindness caused by sunlight reflecting off white snow. Judges in ancient China The true predecessor of dark lenses appeared in China in the 12th century. The plates were made from smoky quartz. Interestingly, they were not invented for going outdoors. Chinese court judges used them to hide their expressions and eyes during trials. This prevented anyone from guessing whether the judge agreed with a witness’s testimony. The arrival of modern sunglasses The transformation into the product we know today happened much later. In the 18th century, optician James Ayscough began experimenting with green and blue lens tints, believing that these colours could correct certain specific vision problems. The real commercial breakthrough came in 1929, thanks to Sam Foster. This entrepreneur began selling the first sun-protection models on the beaches of Atlantic City in the United States. They were an immediate success, transforming a health accessory into a style icon. Frequently asked questions about the origins of sunglasses What was the first material used for dark lenses? The first material used to dim vision through flat lenses was smoky quartz in 12th-century China. The lenses did not correct eyesight; they simply reduced the light passing through them. When were UV filters added to lenses? Ultraviolet protection filters and polarising technologies were refined from the 1930s onwards, driven by the needs of military aviation pilots. Why did sunglasses become so popular in the 20th century? They became a mass phenomenon thanks to the stars of classic Hollywood cinema, who wore them to avoid being recognised by fans in public.

What are sunglasses with yellow lenses for?

You have probably seen them more than once: on the road, on ski slopes or worn by people who spend hours in front of a computer. We are talking about yellow-tinted lenses. At first, many people assume they are simply an urban trend or a modern accessory. However, this colour hides a technical feature that completely transforms the way your eyes perceive your surroundings. There is a very specific reason why professionals choose them, and it has nothing to do with aesthetics. Keep reading to discover the visual trick your brain will appreciate every day. What are yellow lenses glasses used for? Yellow glasses are mainly used to improve contrast and visual clarity in low-light conditions or challenging weather. When the sky is overcast, there is fog or daylight begins to fade, the human eye can struggle to distinguish objects clearly. Yellow lenses act as a visual filter. Their main purpose is to reduce blue light, which is the part of the light spectrum that can cause greater visual distortion and eye strain. By filtering out some of these blue tones, your surroundings may appear sharper, clearer and more defined. When and where should yellow lenses be used? Yellow lenses are particularly useful in several everyday situations: Driving on grey days or at night: They may help reduce the glare caused by other vehicles’ headlights and street lighting. When wearing yellow glasses on the road, you may notice less visual fatigue and greater clarity when identifying lanes and surrounding objects. Outdoor sports: Cyclists, skiers and hunters commonly use yellow lenses. When the sky is cloudy, this type of filter can make changes in the terrain more visible, helping you identify bumps, rocks and uneven surfaces more easily. Using digital screens: Modern devices emit blue-violet light. Soft yellow-tinted lenses can provide greater visual comfort when using a computer or watching television, helping to reduce eye strain at the end of the day. Frequently asked questions about yellow-tinted glasses Can yellow glasses be worn in bright sunlight? They are not usually recommended for very bright conditions. Yellow lenses are designed to increase contrast when the environment is dark, cloudy or poorly lit. Wearing them on a very sunny summer day may allow too much light to reach your eyes and cause discomfort or glare. Can anyone wear yellow-tinted lenses? Yes, most people can wear them without any problems. Yellow lenses do not damage your eyesight. Instead, they may provide greater visual comfort in low-visibility environments or while using digital devices. Do yellow lenses change the real colours of objects? Yes, they slightly alter colour perception by adding a warmer tone to your surroundings. However, your brain usually adapts within a few minutes, prioritising improved contrast, definition and depth over exact colour accuracy. Yellow-lens sunglasses go far beyond fashion trends. They can be a practical option for training outdoors, driving in poor weather or working more comfortably in front of a screen. Taking care of your visual health is the first step towards enjoying every adventure with greater clarity.

What are red-tinted glasses used for?

The curious effect of looking at the world through a crimson filter If you have ever seen a professional cyclist or a gamer wearing reddish-tinted lenses, you have probably thought they were simply an aesthetic choice designed to attract attention. However, a very curious optical phenomenon occurs in the brain the very moment light passes through that flame-coloured lens. It is not about seeing life more optimistically, but about a real change in the speed at which your eyes process what is in front of them. In fact, there is a scientific reason why this specific shade can give you a competitive advantage in a matter of seconds. To discover what happens to your vision when you put them on, keep reading. What red glasses are for and how they work The answer to what red-lens glasses are for lies in the physics of light. Lenses of this colour act as a filter that selectively blocks blue and green light rays, which tend to scatter vision more and create a visual “haze” effect. By allowing mainly red light waves to pass through, the eye experiences an immediate change: the outlines of objects become much sharper, and the contrast between the background and foreground elements increases considerably. The main uses of red-coloured lenses This type of sunglasses is not intended for an ordinary day out, but has very specific applications for performance and everyday well-being: Outdoor sports: They are a favourite among cycling, running and skiing enthusiasts. When the terrain changes rapidly between sunlight and shade, as it does in a forest, these lenses make it possible to identify stones, roots and potholes on the path clearly and well in advance. Changing or overcast light conditions: By enhancing contrast, they work wonderfully on days when the sky is completely overcast or grey. They make flat surfaces appear more three-dimensional, improving depth perception. Reduced fatigue in bright environments: They help relax the eye muscles when moving through environments with a great deal of visual stimulation, preventing you from having to strain your eyes to focus on a specific point. Frequently asked questions about red glasses Can red glasses be worn when driving at night? It is not recommended. As they are a filter that reduces the amount of certain colours entering the eye, at night they could restrict overall visibility too much and interfere with the correct perception of traffic lights or information panels. Do they cause eye fatigue if worn for many hours? No, certified red lenses do not damage or tire the eyes. The brain adapts after a few minutes and compensates for the tint, although when you take them off, your surroundings may appear slightly bluer for a moment. Do they protect against intense sunlight? Although they reduce brightness, their main purpose is to increase contrast. For a summer day at the beach in extremely bright sunlight, traditional dark lenses remain a more comfortable option.