The eye is one of the most important senses. In case of an accident, a few seconds can decide whether vision is lost or impaired. Therefore it is of great importance to protect your eyes while working. In spite of safety precautions many workplaces cannot be completely secured and still bear a risk of eye injuries. Hence, easy access to an effective eye rinsing solution helps prevent or reduce the extent of the injury.


 


Structure and funtion of the eye

The human eye consists of many small parts, all of which are important to the sight.


The light crosses the cornea and reaches the anterior chamber of the eye, which is filled with aqueous fluid. The light is regulated by the iris and the refraction is done by the lens. The vitreous body fills the eye socket behind the lens.


The retina is the most important part of the eye because it is responsible for the visual function. The stimuli are combined here into a vision and forwarded to the brain.


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The eye

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Risks at work

Mechanical injuries: A large proportion of eye injuries are caused by mechanical influences, primarily foreign bodies such as chips, splinters, grains, dust, dirt etc. These foreign bodies can cause superficial or internal injuries such as bruises and bleeding.


Chemical injuries: Chemicals can enter and penetrate the eye in the form of a solid, liquid or gas substance. Both acid and alkaline can cause severe tissue damage. Decisive for the severity of the injuri is determained by the concentration of the chemical, the temperature and the duration of contact. 


 


Rinsing solutions for immediate treatment after an accident

In case of eye injuries, the rinsing solution is of great importance in order to reduce the potential damage. Quick access to an eye wash is therefore required for all workplaces with risk of an eye injuri.


The eye wash sould have the following qualities:


Effective also against exposure to chemicals

Easy and quick to use

Directly available at workplaces with high risks of eye injuries

Our rinsing solution range offers the right solution for almost every workplace. An overview of our bottles and stations can be found on our product page.


 


Important note:


Medical advice should always be sought in the case of eye injury. This also applies to injuries which may first appear harmless.


You’ve got your prescription sorted. ✓

You’ve even measured your pupillary distance. ✓

But because of the way varifocals work, we need to ensure your pupils are correctly positioned behind your new lenses. So, what is OC measurement when it’s at home?

 

Ocular centre height refers to vertical positioning of your pupils behind each of their respective lenses. This is measured in mm from the centre of each pupil to the lowermost section of the lens within the rim of a glasses frame.

 

In other words, we use your pupillary distance and your OC height to horizontally and vertically align your pupils with the middle of each of your lenses.

Oh, and because your new glasses are a different shape, this measurement is entirely unique to how your specific glasses frame rests on your head.

Your OC changes from frame to frame.

 

HOW DO YOU MEASURE OC HEIGHT FOR GLASSES?

 

Man measuring his ocular height with a white ruler

Using a plastic ruler, this OC measurement would be approximately 29mm from the centre of his pupil to the bottom of his lens.

 

With help

  • Stand/sit in front of your assistant

  • Wear the glasses you’re ordering lenses for

  • Your assistant vertically holds a plastic ruler against one lens

  • They align the 0mm mark with your pupil centre

  • They assess the distance to the bottom of your lens

  • Note heights according to your left & right, not theirs.

 

On your own

  • Stand/sit in front of a mirror

  • Wear the glasses you’re ordering lenses for

  • Vertically hold a plastic ruler against one lens

  • Align the 0mm mark with your pupil centre

  • Assess the distance to the bottom of your lens

  • Note heights according to your left & right

 

OC height tips

  • Only measure the lens, not the frame

  • Use a plastic ruler to prevent scratches

  • If it helps, close one of your eyes to help your focus

  • Brace the ruler against your nose & the frame/lens

  • Left & right are from your perspective, not your assistants

 

Measuring your vertical optical centre for sunglasses?

With help from a friend, ask them to shine a torch/light on the lens to illuminate your eye behind. This way they can accurately measure your OC height from the front of each lens.

 

Illustration of ocular height measurements overlaying a man wering glasses

 

WHY IS OC HEIGHT IMPORTANT FOR VARIFOCALS?

Every lens has an apex. This is the optical centre of a lens which should always be aligned with the centre of each of your pupils.

Optically speaking, this is called centration which is achieved by locating your pupils directly behind the middle of each lens whilst wearing a specific glasses frame. This is achieved using horizontal and vertical alignment in addition to the distance between your lenses (DBL).

  • Horizontal centration is measured using your dual pupillary distances

  • Vertical centration is measured using your ocular heights

In the context of varifocals, the importance of pupillary height is so that the neutral gaze of your eyes aligns with the centre of the lens in order to maximise progressive power.

Accurate centration means your pupil is in the optimal position to select the correct area of your lens to look through to see properly.

For varifocals, proper vertical centration prevents you from having to tilt your head to see through the correct portion of your lenses. In the workplace, this can lead to postural issues such as neck or back pain.

HOW DO YOU MEASURE PD FOR PROGRESSIVE LENSES?

For accuracy, progressive lenses require what’s called a dual pupillary distance.

This is a facial measurement from the centre your pupil to the centre of your nose for each of your eyes. The easiest method to do this is with a pupilometer with a slot for your nose which mimics the bridge of a glasses frame.


 

Free PD ruler made from PDF download on blue background


Key notes

  • OC height is always measured in mm

  • Always measure your OC from the bottom of the lens

  • Your OC's & dual PD are susceptible to change if your glasses move on your face. Therefore, they aren't static and have a degree of movement tolerance.

  • Your PD never changes, but your OC height does.

  • For sunglasses, use a torch to see your pupils

 

Ordering varifocals online can be simplified if you have the proper centration measurements. If you invest the time to measure your vertical optical centre, you’ll save time and money on your progressive lens investment.


Raw Red Peppers


Bell peppers give you the most vitamin C per calorie. That's good for the blood vessels in your eyes, and science suggests it could lower your risk of getting cataracts. It's found in many vegetables and fruits, including bok choy, cauliflower, papayas, and strawberries. Heat will break down vitamin C, so go raw when you can. Brightly colored peppers also pack eye-friendly vitamins A and E.

Sunflower Seeds and Nuts


An ounce of these seeds or almonds has half the amount of vitamin E the USDA recommends for adults each day. A large study found that vitamin E, together with other nutrients, can help slow age-related macular degeneration (AMD) from getting worse. It may also help prevent cataracts. Hazelnuts, peanuts (technically legumes), and peanut butter are also good sources of vitamin E.

Dark, Leafy Greens


Kale, spinach, and collard greens, for example, are rich in both vitamins C and E. They also have the carotenoids lutein and zeaxanthin. These plant-based forms of vitamin A lower your risk of long-term eye diseases, including AMD and cataracts. Most people who eat Western diets don't get enough of them.

Salmon


Your retinas need two types of omega-3 fatty acids to work right: DHA and EPA. You can find both in fatty fish, such as salmon, tuna, and trout, as well as other seafood. Omega-3s also seem to protect your eyes from AMD and glaucoma. Low levels of these fatty acids have been linked to dry eyes.

Sweet Potatoes


Orange-colored fruits and vegetables -- like sweet potatoes, carrots, cantaloupe, mangos, and apricots -- are high in beta-carotene, a form of vitamin A that helps with night vision, your eyes' ability to adjust to darkness. One sweet potato also has more than half the vitamin C you need in a day and a little vitamin E.

Lean Meat and Poultry


Zinc brings vitamin A from your liver to your retina, where it's used to make the protective pigment melanin. Oysters have more zinc per serving than any other food, but you don't have to be a shellfish lover to get enough: Beef, pork, and chicken (both dark and breast meat) are all good sources.

Beans and Legumes


Prefer a vegetarian, low-fat, high-fiber option to help keep your vision sharp at night and slow AMD? Chickpeas are also high in zinc, as are black-eyed peas, kidney beans, and lentils. A can of baked beans will do the job, too.

Eggs


It's a great package deal: The zinc in an egg will help your body use the lutein and zeaxanthin from its yolk. The yellow-orange color of these compounds blocks harmful blue light from damaging your retina. They help boost the amount of protective pigment in the macula, the part of your eye that controls central vision.

Squash


Your body can't make lutein and zeaxanthin, but you can get them from squash all year long. Summer squash also has vitamin C and zinc. The winter kind will give you vitamins A and C as well as omega-3 fatty acids, too.

Broccoli and Brussels Sprouts


These related veggies come with another winning combination of nutrients: vitamin A (as lutein, zeaxanthin, and beta-carotene), vitamin C, and vitamin E. They're all antioxidants that protect the cells in your eyes from free radicals, a type of unstable molecule that breaks down healthy tissue. Your retinas are especially vulnerable.



You've passed your 40th birthday, and you're having trouble reading or seeing objects up close. Maybe you've tried to carry store-bought readers around with you, but your eye doctor suggests progressive lenses. Should you take the plunge?

What Are Progressive Lenses?

Progressive lenses have three prescriptions in one pair of glasses. That allows you to do close-up work (like reading a book), middle-distance work (like checking out a website on a computer), or distance viewing (like driving) without needing to change your glasses. They're sometimes called multifocal lenses.

Progressive lenses are an update on bifocal and trifocal lenses. Both of these more traditional types of glasses have telltale lines in the lenses. Progressives have a seamless look. Sometimes they're called "no-line bifocals," but that's not quite right. It would be more accurate to call progressive lenses "no-line trifocals."

Who Uses Progressive Lenses?

Almost anyone with a vision problem can wear these lenses, but they're typically needed by people over age 40 who have presbyopia (farsightedness) -- their vision blurs when they're doing closeup work like reading or sewing. Progressive lenses can be used for children, too, to prevent increasing myopia (nearsightedness). 

Talk to your doctor to see if progressives are an option for you.

 

Benefits of Progressive Lenses

With progressive lenses, you won't need to have more than one pair of glasses with you. You don't need to swap between your reading and regular glasses.

Vision with progressives can seem natural. If you switch from viewing something up close to something far away, you won't get a "jump" like you would with bifocals or trifocals. So if you're driving, you can look at your dashboard, at the road, or at a sign in the distance with a smooth transition.

They look like regular glasses. In one study, people who wore traditional bifocals were given progressive lenses to try. The study's author said most made the switch for good.

Drawbacks of Progressive Lenses

It takes time to adjust to progressives. You need to train yourself to look out of the lower part of the lens when you're reading, to look straight ahead for distance, and to look somewhere between the two spots for middle distance or computer work. Some people never adjust, but most do. During the learning period, you may feel dizzy and nauseas from looking through the wrong section of lens. There may also be some distortion of your peripheral vision (what you see on the edges when looking straight ahead).

Another thing to consider is the cost. Progressive lenses cost at least $100 more than traditional bifocals.

Tips for Adjusting to Progressive Lenses

If you decide to try them, use these tips:

  • Choose a quality optical shop that can guide you through the process, help you pick a good frame, and make sure the lenses are perfectly centered over your eyes. Poorly fitted progressives are a common reason why people can't adapt to them.

  • Give yourself one or two weeks to adjust to them. Some people may need as long as a month.

  • Make sure you understand your eye doctor's instructions on how to use them.

  • Wear your new lenses as often as possible and stop wearing your other glasses. It will make the adjustment quicker.


There is no end to learning, and there is no end to learning.

This poem has inspired generations of young people to study the truth of knowledge, as long as they are diligent, they will get something and go to success.

It is true that there is no shortcut to go on the road of reading and learning, and there is no sailing ship with the wind.

If you want to learn more and more knowledge from the wide range of books and learning, "diligence" and "hard work" are two indispensable.

There is no shortcut to learning

Often asked by students: "teacher, learning is too hard, there is no shortcut to learn?"

Some students, more or less, will have such a question, they all hope to take a shortcut to test well, through the shortcut to enter the University.

But is there a shortcut to learning? Here, I would like to share with you a story I have seen.

Euclid, the father of geometry, is good at solving complex problems with simple methods.

He was rigorous in his scholarship, good at persuasion, and opposed to opportunistic, quick success and instant benefit.

It is said that Ptolemy I, king of Alexandria, was interested in learning geometry and made Euclid his teacher.

Although Euclid simplified his geometry, the king still could not understand it, but he felt very difficult to learn Euclidean geometry.

One day, the king asked Euclid, "is there any shortcut to learning geometry?"

Euclid said with a smile

"My dear majesty, there is no shortcut to study mathematics as well as all subjects.

Learning mathematics, everyone has to think independently, just like planting crops, there will be no harvest if you don't work.

In learning, the king and the ordinary people are the same, there is no special road for the king

"If you don't go through the cold, you can't get the plum blossom fragrance". If you want to succeed, you must first go through some tempering.

A Tsinghua Xueba said in a speech: "there is no born to learn bully, everything is just accumulated."

Nothing is easy in this world. Don't always think about taking short cuts and taking short cuts.

We should always remember that there is no outstanding achievement without hard work, and there is no success without hardship.

2. Learning is hard

Everyone is the same

Mendeleev said: "without double diligence, there is neither talent nor genius."

Please tell your child that learning is definitely hard. It's the same in the world. Don't be afraid to suffer from it. Otherwise, life will be more bitter in the future.

Without boring and hard learning process, there is no way to have happy academic achievements.

The reason why Xueba can get excellent academic results every time is that he can calm down to study while others are playing games, watching movies and going out for a stroll.

"Ten years of hard work makes steel". The growth of every talent is not born!

In order to learn knowledge, for the future, we must work hard every day. Only when you pay today can you get a return tomorrow.

In terms of knowledge, some people ask, "why do most people prefer to eat the hardships of life rather than the hardships of study?"

The number one answer comes from the netizen daytime:

"Probably because of laziness, the pain of learning needs to take the initiative to eat, the pain of life will come when you lie still."

I agree with this netizen's incisive answer. Many people want to escape from the circle of reading and learning when they are reading, because reading is too hard.

Now the knowledge update is too fast, students need to master more and more things, which means that they have to pay more time and energy in learning.

I once read a diary written by a junior high school graduate. When she went to school, she thought reading was a very hard and tiring thing. She didn't want to read at all, and she was very excited about being able to work.

But a month of working life, completely let her change her mind, the original world there is more than a hundred times hard reading things.

From the working girl, we can understand that if we can't eat the hardships of reading, we have to eat the hardships of life.

Don't complain about the hardships of reading, it's your way to the world!

You must work very hard

Ability seems effortless

If you don't accumulate small steps, you can't reach thousands of miles. If you don't accumulate small streams, you can't become a river.

If you don't work hard when you are a child, you will suffer a lot when you grow up. It will be too late for you to regret it!

On the way of learning, don't be afraid of hardship, don't be afraid of being tired. You must work very hard now, and you will be effortless in the future.

See a sentence: smart people are working hard, stupid people are looking for shortcuts.

There is a lyric in the song "true hero": how can you see a rainbow without experiencing wind and rain? No one can succeed casually!

I think so!

There is never a fluke in the world. What you try to get is never by chance.

Don't look for those so-called skills and shortcuts, study hard, down-to-earth, step by step.

Many years later, you will find that the success that once seemed impossible to reach is in your hand.

"There are too many smart people in this world, and too few people are willing to make stupid efforts, so there are only a few successful people," Hu said

Qian Zhongshu also said: "the more intelligent a person is, the more he has to know how to work hard.".

Because they know that only when they study hard and conscientiously can they succeed.

In order to keep healthy and write better, Murakami has been running for 36 years since he got up at 4 o'clock every day since he was 33 years old.

"Many of the ways I write novels are learned every morning when I run along the road," he said.

This made him create a lot of excellent works, such as Norwegian forest, Kafka by the sea, dance and dance.

People who are willing to make stupid efforts are persevering in the cause they like.

Yuan Longping, the father of hybrid rice, spends most of the year in paddy fields, facing the Loess and facing the sky to study super rice.

Zhu Guangya, the Grand Master of "two bombs and one satellite", has done one thing in his life and has become the "commander in chief" in the field of nuclear weapons.

In order to find the ideal filament material, Edison studied more than 1600 kinds of mineral and metal heat-resistant materials, tried more than 6000 kinds of plant fibers, and finally successfully invented the tungsten filament bulb.

Most of the time, we envy those who succeed, but we may ignore their hard work and great sacrifice.

No pay, no return, no shortcut to success!

The quickest shortcut in the world is to be down-to-earth. It is not that talent is not important, but mentality and persistence are too important.

The most terrible thing in the world is not that the people who are smarter than you work harder than you, but that the people who are smarter than you are making "stupid efforts" secretly.

Child, on the way to study, you have to work hard to look effortless.


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