Why Do Eyes Twitch?

Eyelid twitching comes across a commonplace disorder and in medical terms, it is known myokymia. It is an involuntary contraction of eyelid muscles and is more likely to affect the lower eyelid. The treatment for eyelid twitching is subject to its severity.
A few of the most common causes associated with twitching of eyelids include stress, allergies, fatigue or dry eyes, and it may also come to fore as a result of using caffeine. Similarly, poor nutrition or vision problems may also come across as a cause of twitching of eyes.
In most cases, an eyelid twitch is minor and recurs over time after staying for a period of 2-3 days in a single instant. However if the twitching of eyes is more severe, it may last for longer periods of time. The eyes may entirely open up and close by themselves, and the process repeats itself. It may become annoying and may interfere with everyday life as well.
In some cases, if the twitching is severe, it may last for weeks at a time. This type of twitching may occur as a side effect of Blepharospasm, which at times shows up for no apparent reason. Blepharospasm may be caused as resulting from issues related to flow of blood to the facial nerve, or a neurological injury.
The treatment selection of eye twitching is determined by whether the twitch is mild or severe. It involves limiting caffeine and taking more rest, applying warm compresses and using topical eye drops or over-the-counter oral antihistamines. Botox injections may be used to treat severe eye itch, and work by paralysing eye muscles.

How Does The Human Eye Actually Work?

How Does The Human Eye Work
This question is very basic, and also one which ties all of humanity. Strangely Yet, very few people actually possess the knowledge of how the eye works.
So, lets teach you why you see, what we see! (abit of a tongue twister)
Firstly, let’s introduce what makes up a human eye.
Cornea – The guardian and protector of the eye, who keeps foreign objects away from it. The Cornea admits light and initiates the refractive process.
Pupil – This controls the intensity of the light striking the lens.
Lens – The Lens focuses the light through vitreous humour- a gel-like material. The vitreous humour supports the retina.
Retina – The retina is responsible for receiving the image and transforming it into electrical impulses. These impulses are then brought to the brain via the optic nerve.
Light– It’s all about light. There is a reason r we cannot see in darkness!, without this our eyes are pretty much useless.
How do eyes work
Vision – The Process of Seeing
To understand this better, we have divided it into steps.
Step 1 – The light from an object reflects and enters into the eye.
Step 2 – The light enters through cornea. It controls the amount of light permissible to strike the lens.
Step 3 – The light is then focused as per shape and distance by the lens, which works just like the lens of the camera.
Step 4 – The light enters the clear jelly-like vitreous humour and reshaped
Step 5 – The image then enters the retina. It transforms the image into electrical impulses. It sends the image to the brain as electrical impulses via the optic nerves.
And just like that, one can see.

What Is Heterochromia Iridum?

Heterochromia is a strange natural phenomenon that results in a shocking difference in the color of an individual’s (or animal’s) iris. The word itself is derived from the Latin ‘Heteros’, which means different, and ‘chroma’, which means colour. It sometimes manifests as a difference in the colouration of hair or skin as well.
Usually, the amount of melanin contained in the iris determines which colour our eyes are. It is understood that blue eyes contain the least melanin, while brown eyes have the most. Heterochromia of the iris is harmless and does not affect one’s vision. In fact, it can endow oneself with a bewitching difference in appearance.
Celebrities like Christopher Walken and Mila Kunis are famous personalities with heterochromia. In the animal world, Pets with heterochromia are often treasured for this feature. There are three main types of heterochromia based on its occurrence. Complete heterochromia presuppose completely different coloured eyes. Partial heterochromia involves an individual eye having differently coloured portions.
Central heterochromia is the occurrence of differently coloured central portions of the iris, in comparison to its edges. Heterochromia can be genetic or acquired. The genetic version of this phenomenon occurs due to mutation or is inherited. The acquired cases are usually caused by certain medications or injuries. Eye trauma can cause discolouration of the iris. Glaucoma – an eye disease that causes increased pressure in the eyes through fluid accumulation – is another possible reason. However, Heterochromia is quite harmless in most cases. It is also known to be much rarer in humans in comparison to animals.
Only about 11 in every 1000 Americans have been recorded to be affected by the condition. In comparison, dogs and cats are more inclined to have heterochromia.  Dog breeds like Huskies, Great Danes, Dalmations, Border collies, Sheepdogs, Chihuahuas, and Shih Tzus in particular are known to be quite susceptible to this condition. Cat breeds susceptible to heterochromia include Turkish Van, Khao Manee, and Japanese Bobtail. Mixes are also able to inherit this condition. While this fascinating phenomenon is well-understood, its degree of rarity in humans is still not calculable.

Glasses or Contacts: Which are better for helping your vision?

It’s possible nowadays to design your eye wear like you do your wardrobe – lots of different choices for lots of different occasions.

Some people choose the convenience of glasses; depending on your prescription, you can wear them only when driving, or reading, or whatever your vision care specialist advises. But you can have different ones with the same prescription, and tailor the frames to your winter, fall, spring and summer wardrobes. Different colors and styles can make you look serious, fun or fashionable; it’s all up to you these days.
Contact lenses are a smart choice, however, if you prefer not to be among those who are always asking, “has anybody seen my glasses?” It’s so easy to lose track of glasses, particularly those of us who only need them to read. Contacts, on the other hand, can be popped in first thing in the morning and worn all day, and you can even change your eye color, if you wish to. A reputable eye care specialist can help you choose the contacts that are right for you: soft, hard or disposable. What matters is that you choose your eye care products based on the counsel you receive from your eye doctor.
Contacts have come a long way; they aren’t just for the rich and famous anymore. A quality pair of lenses will last a long time if you treat them well; make sure they’re clean, and store them properly. And no one can tell if you’re wearing them, unlike glasses!
Disposable lenses are the right product for some, but not all folks. If you only need a prescription to read, the contacts might not be your best solution. Think of how often you glance at your phone, or read the daily newspaper! You won’t want lenses then, of course. That’s when reading glasses make sense.
But if, like most people, you struggle to see things at a distance, that means you’re near-sighted – yup, you can see things close by, but not far away – then contacts might be the ideal solution; you don’t have to worry about pulling out glasses from your purse or pocket. Either way, be sure to see a reputable, established eye care specialist, one who can help you with all your eye care needs and products!

How Colored Contact Lenses Work

Lots of people these days switch up their contact lens color, opting for blue one week, dark brown the next, and vivid green the following one.
Ever wonder how those lenses are made?
Mostly they are customized to the precise tint you want, but a little depends on the color of your natural eye. There are two types: translucent tinted lenses that are for light eyes only, and they come in a solid or clear tint. They may just enhance your natural color, or may change it quite dramatically.
Then there are opaque tints, which are solid tints made to mask the iris and change dark eyes. The tint is placed either within the lens, or on top of it. Imagine a doughnut with no hole, and you’ll get the idea.
Colored contacts used to be the sole territory of, say, actors with lots of extra cash to spend getting that azure shade of blue loved by casting agencies and film directors, but no more. Today they are available to just about anyone; they can be custom made for more reasons than just fashion and vanity. A “sport tint” can be added to reduce glare and increase depth perception. That means giving you, the wearer, a heightened advantage during your Sunday afternoon game of tennis.
The color is added only to a portion of the lens, so at some moments – like when you blink – the color portion might slide a little over the pupil. If the color is opaque, it can look a little odd when that happens. The key is getting your lenses from a reputable vision care specialist – that’s crucial. You want someone who can customize the color, size and prescription. No matter how temptingly low a price is you see offered by someone online, don’t bite: they probably aren’t the source you should turn to. You don’t want to cause problems with your vision by seeking out someone solely because they’ll give you a discount!
Colored contacts aren’t just for the rich and famous anymore, so see a vision care specialist and get some good advice on the pros and cons of wearing them. If Kanye West can get away with wearing stark blue lenses on the runway, you can wear whatever color you choose…you’re only limited by your imagination.
be sure to check out our current range of colored contact lenses and color changing eyedrops www.changemyeye.com

Blue Light, Is It Bad For Your Eyes?

Energy and wavelength play a large part in the place that visible light plays in the average person’s life. The average human eye has a high disposition to exposure to blue light. The average human eye is not very efficient at blocking blue light, which may lead to the formation of cataracts and other retinal diseases. Blue light mostly originates from LED light, computer monitors, and flat screen TV’s. In comparison to the light from the sun, the blue light from electronics is relatively insignificant. But blue light is the leading source of digital eyestrain. Digital eye strain is a common center of fatigue, and symptoms of fatigue. Keep in mind that blue light is the most common form transmitted by cellphones and is very toxic for the human eye. This may lead to dry and/or irritated eyes as well as discomfort. Keep in mind that blue light is the most common form transmitted by cellphones and is very toxic for the human eye.
Many experts are adamant in exploring the idea that blue light is far more beneficial than detrimental. The main argument being that blue light isn’t the direct cause of pre-mature blindness. Blue light may be an anchor that initiates basic human function, as the human body is so used to it. Blue light initiates parts of the brain that aren’t stimulated by any other type of light, the effect that blue light has on the brain is irreplaceable and serves as a great benefit to our life with the amount of technology we come into contact with.

Unlocking The Potential Behind Your Eyes

It is a well-known fact that human beings always judge based on certain physical characteristics. Most of these observations are things that they spot on another person when they first meet them. This would generally cause a first impression that might be positive or negative; nevertheless, the observer has already made up their mind.
Hence, it is important to always leave the best first impression when meeting new people. It has been proven that one of the first things that people look at is the other person’s eyes, and more specifically the eye color. This also includes its shape and the bags under your eye too! The eyes form an important part of any human being, as such your eye color has a huge impact on the first impression to the person in front of you. Your eye color becomes a huge part of your identity where it starts to affect you in all ways you might not even imagine. Having the right eye color can definitely get you places!
Imagine the confidence boost you would gain from having your favorite color as your eye color. This would give you a huge boost in your life that will affect you positively pushing you to the success you’re seeking.
Choosing the right eye color for the right time sounds like a thing we would hear 50-100 years from now, but that possibility is becoming a reality. Imagine being able to control all the outcomes in your business meetings or even in an important outing, blue eyes on an important date, and maybe green eyes at a business meeting?, due to the fact that green eyes establish trust & confidence. This is exactly what you can achieve by using colored contact lenses with different colors. Although www.changemyeye.com eyedrops are 98% of the way there in terms of changing your eye color, these changes take months not days, having something quick and easy is definitely where natural colored contact lenses shine through.
The eye is a very strong gift given to all of us, hence we should use it to help us shine. But lets just sit back and appreciate the fact you can create your own identity by picking the right color for the right time and understanding the strength of the eyes. Using it wisely can help you reach places you never thought possible.

Does eye color affect the way you are perceived?

Have you ever wondered whether your eye color could effect the way you are treated by others? Or how people perceive you?.
www.changemyeye.com decided to look into it further and here’s what we found.
There is a lot more to the human eye than just seeing. For example, research shows (white) blue-eyed children to be more behaviourally inhibited than their brown-eyed counterparts; among stuttering children, those with blue eyes are more severely dis-fluent in their speech; and there have been studies in the past which attempted to use eye-color as a medicinal prognostic factor. (Eye color has even been used to predict alcohol use).
Given the type of research results mentioned above you might not be surprised if I tell you now that a study – soon to appear in the Journal of Personality and Individual Differences – has detected that men with brown eyes are perceived as significantly more dominant than their blue-eyed peers. However, there is more to the finding than …well…first reaches the eye:
For their study, a team of Czech researchers, took similar neutral, non-smiling profile pictures of 40 men and 40 women between 19 to 26 years of age. Then they asked a group of 62 raters -31 of them male – to judge the photographs for perceived dominance (as well as attractiveness) on a simple 10-point scale.
As mentioned already, brown-eyed males were perceived as more dominant, but it is what followed next, that is more interesting:
To better understand what was driving the observed effect, the researchers now used photo-editing software to change the eye color in all pictures from blue to brown and vice versa. After having done so, they repeated the experiment with a new group of raters, but – somewhat surprisingly – the original dominance ratings remained relatively unaffected. Although eye color was a highly significant predictor of perceived dominance in the first rating session, switching eye colors for all pictures did not significantly affect whose pictures were perceived as dominant and whose weren’t.
So what is happening here? Evidently – and additional morphological research by the same research team supports this – eye color correlates with other facial features that raters use to judge dominance. For example, brown-eyed men in the above study had broader chins, thicker eye-brows which are closer together, and larger noses; all of which may be viewed as the actual drivers of higher dominance ratings. But yet there is more to learn here, since we should still want to know how this link between eye color and dominance signalling features comes about:
Is it simply that there is a strong genetic link between features that signal dominance and eye color? Unlikely, say the authors

What does 20/20 Vision mean?

Have you ever heard the term ”20/20 vision” or the age old saying that hindsight is 20/20?.
Well, what does 20/20 vision mean? Let’s find out!

20/20 is basically defined as you can see at 20 feet what a “normal person” can see at 20 feet. 20/40 means you can see at 20 ft what a “normal person” would see at 40 ft.

If we get more in depth, 20/20 vision is actually talking about the resolution of the human eye, the 20/20 E famous on the snellen eye charts are actually very specifically sized such that each black line or white space in between is 1 arcmin of angle subtended from your eye. Therefore, resolving a 20/20 E lets you know that you can see 1 arcmin of resolution. 20/40 essentially means that the resolution you can see is 2 arcmin (smaller resolution is better).

In reality, our limit coming from the size of the rods and cones should be closer to 20/10.

Believe it or not, our eyes actually have quite a lot of optical aberrations, some (like astigmatism/defocus) which can be easily corrected with contacts or glasses, but others cannot. These difficult to correct aberrations can be known as higher order Aberrations (HOAs), which are usually relatively low compared to defocus and the larger lower order aberrations that can be corrected. For the most part, HOA really don’t affect our vision that much and lots are image processed out by your brain so you don’t really notice them, yet these with some parts of the uncorrected lower order aberrations make it so you are unable to reach 20/10 vision.

With an adaptive optics system, we are able to measure the wavefront aberration in your eye in real time and correct it with a deformable mirror which changes thousands of times a second to correct the wavefront. This effectively removes all the aberrations in your eye giving you almost perfect vision (~.01 microns rms) which enables people to see with 20/10 vision.

It is not called 100% vision because 100%, 90% ect vision would not really fit what is being measured. having “fully 100% vision” doesn’t really tell you what the resolution is, while 20/20, 20/40 ect does.

Going into stronger detail, the term 20/20 is a measure of visual acuity. This notation is now only used in North America, while Australia and New Zealand uses a 6/6 notation.

These figures are based on letter charts which are used in the standard sight test, such as the Snellen chart. The top number refers to the distance at which the chart is viewed – 20 feet (or 6 metres) – and the bottom number refers to the distance at which a person with ideal vision can see a letter clearly. Thus if you have 20/40 (or 6/12) vision then you will just be able to see something from a distance of 20 feet that a person with perfect eyesight will be able to see from 40 feet.

How the Eye Works: The Anatomy of The Human Eye

After surveying multiple people on www.changemyeye.com regarding the most important human senses — sight, hearing, taste, smell and touch — people consistently tell us that their eyesight is the mode of perception they value (and fear losing) most. However, most people don’t have a good understanding of the anatomy of the eye, how the eye works, and health problems that can affect the eye.


In many ways, the human eye works much like a modern day camera:

  1. Light is focused primarily by the cornea — the clear front surface of the eye, which acts like a camera lens.
  2. The iris of the eye functions like the diaphragm of a camera, controlling the amount of light reaching the back of the eye by automatically adjusting the size of the pupil (aperture).
  3. The eye’s crystalline lens is located directly behind the pupil and further focuses light. Through a process called accommodation, this lens helps the eye automatically focus on near and approaching objects, like an autofocus camera lens.
  4. Light focused by the cornea and crystalline lens (and limited by the iris and pupil) then reaches the retina — the light-sensitive inner lining of the back of the eye. The retina acts like an electronic image sensor of a digital camera, converting optical images into electronic signals. The optic nerve then transmits these signals to the visual cortex — the part of the brain that controls our sense of sight.

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