The Freeform varifocal lenses offer a far wider viewing area, which reduces non-adaptability to varifocal lenses. This reduces dizziness or balance problems that can occur with new varifocals. As the prescription is surfaced onto the back of the lens, this is nearer to the eye offering a better field of vision for distance, intermediate and reading. These lenses offer a guarantee that you will adapt more easily to your new varifocals  

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red-green-color-blindnessWe all are familiar with the following situation right? After someone has identified oneself as red or green color blind, we immediately hold all objects in red or green right in front of their eyes, just to make sure, that they really can't see the way we normally do.
How does this occur? If they have inherited color blindness, the affected individuals cannot differentiate between red and green colors.

Cause


There are two types of retinal photoreceptors in our eyes that create the colorful bustle in front of us visible namely the rods, which are responsible for the light-dark vision and the cones, which enable color vision. The cones are subdivided into three different types, depending on their spectral sensitivity:

L-cones – are sensitive to long-wavelength light & are responsible for seeing red
M-cones – are sensitive to medium wavelength light & are responsible for seeing green
S-cones – are sensitive to short-wavelength light & are responsible for seeing blue

You might think that there is something wrong with L and M cones. Well, quite as guilty as they seem, they're not. The real culprit here is called Opsin and it is the protein portion of the visual photoreceptors.
The more Opsin is formed in the cones, the better they recognize light waves and therefore colors. The formation of Opsin for L- and M-cones is encoded on the X chromosome.
If this is damaged or defective, it causes red-green visual impairment or in some cases even blindness. Thanks to the X chromosome, statistically more men are affected, since they only have one chromosome.

 

For everyone who's more interested in the physiology of the eye, the old biology stapler should have further information!


Diagnosis & Types

Incidentally the ones, who are affected, hardly notice that there's something wrong, since they are accustomed to it from birth.
Its only when the affected person decided to take up a job as a train or bus driver, or a pilot, that clearing extensive ophthalmological examinations may act as a hindrance before they can pursue their dream job.

The Ishihara test can detect these defects. Colored circles, for example in green and red types, depict figures that only normal sighted individuals can correctly recognize.
This information about the type of refractive error should be left to the ophthalmologist especially since the variety of refractive errors does not stop with red and green:

  • Protanomaly (red) and Deuteranomlay are called a weak sight of colors, because the red and green cones degenerate.
  • Protanopia (red) and Deuteranopia (green) are called color blindness, because the red and green cones are completely missing. For those affected with it red and green appear thereby as gray types.
  • If you are affected with Tritanomaly your blue cones degenerate; Tritanopia means they're completely missing.
  • Anchromatopsia is the inability to see any colors.

 

Unfortunately, color vision deficiency or color blindness cannot be cured. But luckily there are specsfactory.co.uk varifocal lenses, which support the working rods and cones perfectly! With tinted lenses you can also cope with the  sensitivity of light.

 




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The psychology of wearing sunglasses

 

Within our last blog, we spoke about how the judges in china during the 12th century, wore smoky quartz lenses to hide any emotional response they might exhibit, while listening to testimony. The generation of today wear sunglasses to protect their eyes from sunlight. At least we thought so. A Psychologist by the name of Paul Ekman said that one third of our 23 facial expressions involve the eyes. Sunglasses may slightly obscure your view of the world, but they also hide the world's view of how you are feeling.

Sunglasses are able to reduce a persons ability of noticing the emotions of another. For example, if a person smiles, it can at times be difficult to notice whether it's a real or fake smile. However, when wearing glasses, it can be almost impossible. In a real smile, a muscle called the orbicularis oculi is activated, making it hard to hide crinkles from appearing around the eyes. The eyes indeed say a lot about how we feel. While other people take semi-delusional comfort from wearing sunglasses. We feel invisible, or less visible, behind our sunglasses.

Finally, there are also a small number of individuals who actually need to wear sunglasses for physical or psychological health reasons. Photophobia is a condition where an individual is negatively affected by bright light.

Body language of sunglasses

 

Wearing and removing sunglasses has various reasons. Wearing sunglasses can be a sign that one wishes to protect their privacy and identity, reduce intimacy with others or for the real reason of protecting the eyes from being damaged by sunlight. They are effective in concealing the eyes, which creates a barrier between you and others.

If a person wishes to welcome and continue a conversation, it is necessary to remove the sunglasses and make eye contact.If both parties wear glasses and agree to leave them on during a conversation, then a less intimate encounter will take place. If a person does not wish to remove their eyewear during a conversation, it is a sign that they do not wish to expose themselves to the judgement and intimacy of others. Whereas those who remove their eyewear wish to be honest, open and create a trusting bond. Wearing sunglasses on the top of ones head comes across as cool, giving the impression of having 2 sets of eyes.

Alternatively, wearing sunglasses may not have a reason at all. This is due to some people being extremely sensitive to bright light and wear sunglasses from the moment they leave their house until they reach their indoor destination.

Sunglasses are an aid

 

As we all know, sunglasses are protective eyewear designed primarily to prevent the ultraviolet radiation in sunlight from damaging your eyes. Ultraviolet radiation can cause short-term and long-term ocular problems such as photokertitis, snow blindness, cataracts, pterygium, and various forms of eye cancer. It was first during the late 1920's that sunglasses began becoming a modern accessory.

How sunglasses came to exist

 

In prehistoric times, ivory disks or goggles were worn by the Inuit over their eyes with slits to protect their eyes from the extreme sun glare, while in the 12th century judges in China used smoke-colored quartz lenses over their eyes in order to conceal their expressions in court. The judge's evaluation of evidence was to remain secret until a trail's conclusion. Back then, darkened lenses never intended to protect the eyes against sunlight.

 

It was first in the early 1930's that glasses slowly became modern and an accessory for women. At the same time the American Army Air Corps and Navy helped to create specialized sunglasses known as aviators that acted as a second layer of eyewear underneath the goggles of pilots. The second layer helped reduce glare that the pilots had always experienced at high altitude. These frames have been extremely popular ever since. Polarized sunglasses were invented few years later and have been a hit ever since.

Advertising campaigns in the 1960's led to the development of a giant industry that only a few decades earlier never existed. As women since ancient times had hidden seductively behind an expanded fan or a dipped parasol, modern women and men discovered an allure in wearing sunglasses, irrespective of solar glare.

Today sunglasses come in all shapes and sizes and suit every individual taste.The generation of the 21st century have more than one pair of sunglasses. There are many sunglasses amongst the many designer frames in our collection. Our top seller is always the pilot glasses which are a classic and the current trend, because they are popular every year and our designers always introduce new frames. It is necessary to bear in mind that pilot sunglasses can be too big for small faces. Apart from that, this trend can be worn by all ages.

Take a look at our collection and maybe there is a pair that will suit you perfectly.

If you need varifocals, there is a lot to think about before buying, so that you can wear your new glasses comfortably.

The development of varifocal lenses


Varifocals are multifocal eyeglasses, which means they correct myopia and presbyopia simultaneously. Each lens is made up by a long-distance zone (upper third of the glass), a near-distance (lower third), and an intermediate zone, which is connected smoothly to the others. The size of each of these areas can be customized by your specsfactory partner optician, tailor-made for your eyes.

 

The consultation at your specsfactory partner


First, you can choose your favorite frame among 250 different ones, so that the lenses can be adapted to it. To ensure an optimal vision with your varifocals, the glasses must be positioned correctly in front of your eye. The specsfactory partner optician determines your individual vision needs and makes various measurements. Approximately 2 to 3 weeks later you can pick up your custom-made, personalized varifocal glasses in your local optician’s shop.

 

Choose the right eyewear model for your varifocals

When choosing your favorite frame, you should make sure that the lens height is at least 25 millimeters, so that the different visual areas of the lens have enough space. Only then is it guaranteed that you will have the best vision with your new glasses. Your specsfactory optician is happy to advise you with regards to the ideal model for your needs.

 

The different prices

Varifocals differ a lot in lens quality. The cheaper the lens, the smaller the size of the viewing zones.  The higher the lens quality, the more they they can be adjusted to the individual’s viewing zones. Standard glasses with varifocal lenses are expected to have a starting price of £49. Customized lenses of high quality including a designer frame are available from around £400. Other factors such as material, tinting, extra thinning etc. can influence the price as well.

At specsfactory we only offer customized premium lenses for the unique price of £169. We are able to lower the price this much, because we manufacture our lenses and frames ourselves and distribute only through independent opticians. This means we the optician does not have to pay brand or license fees in order to show or offer our glasses to their customers. This is normally something you see with the most famous brands of the UK market, but favors mainly the big franchises.
 

For the best advice you should always consult an optician: Your local specsfactory partner looks forward to helping you! Make an appointment and receive the best consultation possible.

 

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