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How does colour vision work?

How does colour vision work?

And what does this mean for people who wear sunglasses?

You aren't even thinking about it while it happens: our eyes perceive over 200 different shades of colour, differentiate completely between the most detailed nuances and recognise over 20 saturation and 500 brightness levels. You can see the result: every day we assimilate millions of colour stimuli – a dream-like world of colours...

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Everything You Should Know about Your New ZEISS Precision Lenses

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Basics Vision

 

Can the wrong pair of glasses or bad light damage your eyes?

We'll tell you what happens when your eyes have to work too hard
If your glasses are not optimally fitted, then there's no way you can benefit from your full visual potential. This can significantly impair your quality of life. Think about it: reading the menu in a...

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Carl Zeiss, Ernst Abbe and Otto Schott – A Winning Team

They changed the world with their ideas
These men combined their expert knowledge of mathematics, physics, chemistry and precision mechanics like no one before and laid the groundwork for numerous trailblazing inventions: Carl Zeiss, Ernst Abbe...

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Blinking, crying and seeing stars

What makes our eyes so special
We blink, cry and see 'stars' – but what makes our eyes to react like that? Why do we blink? What role does our retina play? What makes our eyes shed tears? How do tears of sorrow differ from tears of...

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Distance Spectacles and Reading Spectacles

What are the key points to remember when choosing single vision lenses?
Reading and distance spectacles are the most common ways of improving vision. So what is it that makes these single vision lenses so special? And what are the key points to remember when choosing the best...

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The complexities of the human eye – from the blind spot and macula to focused and peripheral vision

How our brain compensates for perplexing design flaws in the human eye.
Over the course of the last 500 million years, evolution has produced an incredible variety of different eyes from a simple light-sensitive spot. This has proved to be a major evolutionary step, because...

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A checklist for buying new spectacles

Spectacles for near and far, progressive spectacles, sports spectacles, reading spectacles or spectacles for the workplace: what do you need to know?
What’s important when you’re buying a new pair of spectacles? What do you need to know? What mistakes can you avoid, and how can you further enhance your enjoyment of your new spectacles? BETTER VISION...

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Different eye sight test results – how can this happen?

Or: When is the best time to go for an eye sight test?
We are often asked why the measuring results obtained in sight tests differ – even if two examinations are performed in short succession. Different results in subjective refraction may be attributable...

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What is the eye's centre of rotation?

A special point in the eye plays more than a secondary role in the production of ZEISS spectacle lenses
Did you know that a special point in the eye – its centre of rotation – plays a key role at ZEISS in the optimisation of precision spectacle lenses? This can be of decisive importance in determining the...

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The secret behind the perfect spectacle lens design

A lot of experience, mathematics and exact knowledge of the spectacle wearer’s needs are required to provide a tailor-made solution
What do you think? Which product incorporates more optical knowhow – a spectacle lens or a modern high-performance camera lens containing five individual optical elements? Camera lenses would be the immediate...

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Eye allergies – and fast remedies

Effective therapies, effective protection
Summer time – hay fever time! A few days of spring sunshine, and most of us begin to look forward to the lazy, hazy days of summer. Many people, however, have other things on their minds: the dreaded allergies...

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Why do people see differently?

Richer colours, better night vision, enhanced contrast – for better use of our full vision potential.
Whether colour perception, 3D vision or night vision: they all vary from one person to the next. Why does visual performance vary so much from one person to another – and how can we improve our eyesight...

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How modern prescription spectacle lenses maximise your vision potential

In conversation with ZEISS on holistic eyeglass lens determination and prescription spectacle lenses optimised for binocular vision.
All spectacle wearers are familiar with sight tests or subjective refraction. The optometrist fits a trial frame and asks us to read letters, numbers or state the opening direction of rings in different...

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Spectacles, contact lenses or laser surgery – what's right for you?

Around half the population has a vision problem. However, this is now easy to correct since there is a suitable solution for virtually all vision problems.
The eye is our most important sensory organ. Even today, medicine has not found a way to prevent the natural deterioration of vision. But spectacles, contact lenses or surgery make it possible for almost...

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When spectacles are too tight. The best tips for relaxed vision and the perfect fit.

Whether it's the sides, nose bridge or spectacle frames, there are several criteria that are crucial for optimal vision.
The spectacles are pressing against the sides of your head, seeing is strenuous, the nose bridge is annoyingly uncomfortable. What do you do when the spectacles don't fit properly? What can you watch out...

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Help, does my child need spectacles?

Why it's so important for babies and children to have eye tests on a regular basis.
Just like adults, children perceive about 80 % of their impressions visually. Good, sharp vision is therefore fundamentally important for children development. What should parents know before visiting...

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Health problem: watery eyes

If your eyes are watery constantly, the cause may be an eye condition
When laughing or crying, it is completely normal: the tear ducts open and the tears flow. But when your eyes begin to water without any apparent reason, an eye condition may be the reason. There is no...

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Dry eyes – what to do when they burn and get itchy?

Dry eyes are a common reason for people to go to an ophthalmologist.
Dry eyes are unpleasant and can be painful. A possible cause is a problem with the eye's natural moisture, i.e. that the body does not produce sufficient tear fluid. This can be triggered by environmental...

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Optical Illusions

Do you see it?
Eyes are our most important sensory organs because we usually only believe something when we actually see it with our own eyes. The Greek philosopher Plato explained why we should not always trust our...

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How 3D spectacles work

New 3D spectacles such as the cinemizer by ZEISS open up whole new worlds of entertainment for your eyes
As humans, our stereoscopic vision has given us an evolutionary advantage since primeval times. Finally, thanks to sophisticated 3D spectacles, we can now watch TV or big-screen movies in 3D. This modern...

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What is colour blindness and what can people affected by it do?

A genetic defect is the reason that 180 million people worldwide are colour-blind. Doctors distinguish various degrees of severity.
Most commonly encountered are those who cannot confidently distinguish the colours red and green. This is called colour blindness. Fortunately, complete colour blindness is rare. Those affected are only...

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Medicine can impair vision

Care should be taken with some medicines. Under certain conditions they can damage your eyes.
An eye defect or eye disease is not always the cause of vision impairment. Some medicines can also lead to the eyes not functioning normally.

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Why good vision is so important

If one sense is missing, the other senses have to take over the work. The eyes play an important role in this.
The human senses are our contact to the environment. The human brain combines the fireworks of neurons of seeing, hearing, smelling, tasting, and touching into a meaningful whole. But we don't think about...

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How do our eyes smile?

Whether we are wearing spectacles or not, our eyes are a significant factor in how we communicate. Here are our top 3 tips for spectacles wearers to achieve smiling eyes.
Laughing is good for us – because a really good laugh uses as many as 100 muscles in our body and face. Eye contact and smiling eyes also significantly facilitate our communication with other people. But...

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How to keep your eyes healthy

Our most important sensory organ needs to be protected and cared for. There are many things to consider in this respect.
Our eyes are constantly exposed to a number of environmental irritants – dust, UV rays, foreign particles and many more. It is therefore important for us to be aware of those things that are good for our...

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Are carrots good for your eyes?

From a young age, we are told that carrots are good for our eyes. Unfortunately, this is only true to an extent.
Carrots are good for the eyes – or have you ever seen a rabbit wearing glasses to prove otherwise? Not only is this comparison not very funny, it hasn't got a leg to stand on. And yet this health myth...

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Does reading in poor light damage your eyes?

It's a popular myth that almost everyone has heard: reading in poor light damages your eyes. However, the latest studies show that this isn't true at all.
Winter is probably the best time to get round to reading a good book, especially by candlelight or the soft light of a bedside lamp. Children even like to hide under the covers with a pocket lamp. However,...

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A workout for your eyes

Our eyes work hard every day. With a couple of simple sight exercises, you can relax your eyes and refresh your vision
The modern lifestyle places great demands on our eyes. If you work with a computer, for example, they have to adapt to different contrasts and level of brightness up to 30 000 times a day. The figures...

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Low vision devices for work: When better vision is just not good enough

ZEISS precision loupes for all who have to have a sharp eye for detail in their jobs
Teleloupe spectacles are ideal for professionals such as dentists or precision engineers who need to be able to achieve the ultimate in precision in their work, even with tiny objects. But only customised...

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Better quality of life and more independence: better vision with low vision devices

What possibilities exist when even glasses are no longer enough?
Whether through an illness, an accident or with age, low vision is something that can happen  to any of us at any time. Individually fitted low vision devices can help wearers to see better and restore...

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What is a visual impairment?

Not only old people are affected by vision problems. This article discusses what helps the visually impaired; offering them flexibility and pleasure in life
Many of us wear spectacles or contact lenses; it is thanks to these visual aids that we can see normally again. But what to do when this is not sufficient? Any human being can, at any time, be afflicted...

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The perfect lenses for optimum vision

A vision test will reveal an individual’s visual problems. Based on these results, an eye care professional can prescribe the optimum lenses that will enable the patient to regain sharp vision.
80 % of all the information our brains receive is via the eyes. But as well as the magic of sight, it also has its defects. At least 47% of the UK population suffer from Ametropia and should wear spectacles...

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The History of Spectacles

The first visual aid was invented around 700 years ago
These days, it is a matter of course: When your vision deteriorates and your eyes grow weaker, you go to your optometrist or ophthalmologist and have a pair of spectacles fitted.  But this was not...

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Surgery in lieu of glasses?

Enjoy excellent vision again without glasses – this is what laser surgery promises. But beware: The procedure does have inherent risks
Many people who suffer from visual impairments get very excited when they hear commercials hailing laser eye surgery as totally risk free. For patients whose vision is so poor that they can only perceive...

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Contact Lenses or Spectacles?

Both are a good choice. It’s really a matter of taste – and a matter of what’s good for your eyes
Whether you’re kissing someone, playing ball sports or riding a horse: The frames of spectacles do tend to get in the way sometimes. Your lenses may get all fogged up, which can spoil a romantic moment....

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Plastic or Glass Lenses?

Which material is best for which patient? Do your homework before you shop for glasses and you will enjoy better vision.
This fundamental question is asked every time a pair of spectacles is purchased: Do you prefer plastic or glass lenses? When you decide, remember that your glasses should be sturdy, attractive, shatter-resistant,...

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Everything in View at the Computer Work Station

Why special reading spectacles/varifocals can make your work easier
Reading spectacles are often not ideal for desk work. You can see everything clearly when reading documents, but when a colleague walks through the door you cannot quite recognise him/her or you have difficulty...

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Hot Trend: Coloured Lenses

How to go colour crazy with shaded lenses
Coloured or shaded lenses have been on the market for quite some time. Fashion trends do drive this product and the palette available covers an impressive spectrum. This article provides insights into...

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Excellent vision despite eye problems

Our eyes are our most important sources of perception – consequently, any eye disease needs instant attention
Our eyes perform precision work all the time. They focus on objects that are close-up, zoom in on those off at a distance and have to adjust to different lighting conditions over and over again. We take...

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What to do if you have vision challenges

Do you have 20/20 vision or are you nearsighted, or farsighted? Do you have age-related vision impairments? A vision test will provide all the answers.
Human eyes can differentiate between several thousand colours, assess the speed of a flying tennis ball and recognise letters as well as images in less than a fraction of a second. However, all of this...

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Get the best protection for your eyes

Very sensitive and completely irreplaceable: Hazards to the eye are manifold and can entail disastrous consequences
Anything could happen to our eyes in an instant, whether at the workplace or while engaging in recreation and sports. It is certain that our sight organs are too valuable to expose them to any unnecessary...

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Our eyes – our windows to the world

Our eyes function like a camera in which numerous parts work together perfectly. This is good news, because vision is our most important sense
For most people, it’s a matter of course: You open your eyes and you see the world. When the alarm clock goes off, you see the red numbers, the colour of the bedspread and your pyjamas, the green leaves...

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The eyes of our children

When a child is born, it can see instantly. However, its visual acuity does have to develop over time.
The newborn’s eyes are beaming, a smile brightens up its face – those are among the most amazing moments for a mother as she holds her baby in her arms. At this stage the baby’s eyes are still developing...

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