Thursday, March 6, 2008 Hmm... The Human seems to wonder more and more about eyewear nowadays, always pausing at optical shops, especially to look at contact lenses. He must be getting vain.
But these contact lenses, what difference does it make from using spectacles? It seemed like quite a cool idea at first, that I could be sure to have correct vision at all times and in a wider range, when the lenses are placed on my cornea - instead of further away, when I have to see through the glasses, and everything outside that range is blur! But in most cases I don't use the extreme ranges...what is a contact lens good for, exactly?
Luckily for me, the Human decided to find out more.
There are a few advantages and some kinds of eyes would like contacts better. The vain ladies (or even guys!) may want to look good, while the sporty would prefer contacts that would not drop off and various other reasons. Also, it is good in wet weather, generally. It wouldn't fog up or get covered in raindrops to blur my vision!
But here comes the scary part. Many various complications can arise from wearing these contact lenses, and about 4% of the eye-users of these lenses get them every year! These usually arise due to excessive wear, overnight wear and more: ending up hurting the Eyelids, the Conjunctiva, Cornea, and even the tear film of eyes. Insertion, Removal and Care for contact lenses are 3 important processes, and if one is not careful and meticulous; the eye might just be hurt or infected by harmful micro-organisms! By things that the eye cannot see! That's the most scary part.
If I could, I would tell the Human to forget about those contact lenses. I definitely wouldn't want to take the risks! (written by Justin) NoEyeDea@10:34 PM Sunday, March 2, 2008 The Human brought me to the optician today, and I got a pair of spectacles! Everything comes into focus perfectly now, and I am very happy. I was kind of curious about how this miraculous invention worked, so I went online and checked it out, and this is what I found out.
Spectacles work by refocusing light rays that enter the eye such that they fall onto the retina clearly. In the case of simple myopia, a pair of spectacles that correct only for short-sightedness is generally prescribed. There are also other preventative measures that can help to prevent vision from deteriorating even further. For instance, reading should be done with an upright posture in a well-lit place. Take a break from eye-intensive activities, like watching television or playing video games, every 30 minutes or so. Stare out of the window at a faraway green object. Contact lens can also be prescribed for simple myopia. To test for the degree, the optometrist generally uses an autormated refractor to measure the degree of refractive error, along with a phoropter and a Snellen eye chart.
Just like the previous posts, you can find out more by clicking on the links! (written by DerHui and Zachary) NoEyeDea@12:16 PM Saturday, March 1, 2008 Help! I can't see clearly anymore! I can't seem to focus on distant objects anymore! Everything looks blurry! I'm not too sure, but I think that it's because something has happened to me, and it has changed my ability to adapt to different focal lengths! I went online and checked it out, and this is what I generally found out. Maybe I'll go read up more about focal lengths and stuff tomorrow.
According to Helmholtz, the eye’s default state, with no external forces on it, is a round ball. This shape allows the eye to focus on near objects. The ring-shaped ciliary muscles pull the lens forward, allowing the eye to focus on distant objects. Studies have shown that in general, the higher the rate of myopia, the longer the length of the eye. This indicates that when the ciliary muscles focus on distant objects, the eye stretches and over a long period of time, accommodates to this shape. This is one of the mechanical models of the understanding of myopia. There are other mechanical models that can explain myopia, mostly involving the potential stresses forced onto the muscles and lens within the eye that causes them to shift into a permanent state of distant-object focus. Some models also indicate that image quality and balance i.e. proper lighting and contrast, etc. can also contribute to the onset and development of myopia.
If you'd like to know more about the details of this theory, or other controversial theories, read more by clicking on the links! (written by DerHui and Zachary) NoEyeDea@10:57 AM Friday, February 29, 2008
Oh my god. The Human just watched a video today about eye(i)'s origins! Learning about where my roots comes from and how the eye community came so far to reach this stage of evolution is so cool!
Oooh, and i saw my eye-ancestors! I sense this closeness to them and yet, there's something different about them from me. According to the video and the brains superior informations, these eyes ancestors has something called the "third eyelid". It is also known as the nictitating membrane, which either transparent or translucent. It can be drawn horizontally across the eyeball to protect and keep moisture within the eye while still retaining visibility. I found out through the video that many reptiles, like crocodiles, and birds in this world still has this feature! this is needed because birds fly through the air and moisture is quickly lost by the eye in the wind if this membrane is not there.
As I looked into the mirror, I suddenly saw this small vestigial remnant in the corner of me! ah, at least i know I'm related to my eye ancestors now! (and not some eye picked up in the dustbin...-.-) As i wonder why have this special feature is lost in me, i realized that it is because humans are not as exposed to the drastic winds and weather conditions as other animals do, thus the feature is slowly lost through the ages of selective evolution.
there! can you see the remains of the third eyelid at the corner of me?!
now, as at looked back through the generations (and the video), I realized how evolution had changed the lives of many in this ever-changing world. Three cheers to evolution! (written by Ling Evan)
NoEyeDea@10:48 AM Thursday, February 28, 2008
Ahhh... eye(I) am very sad today.. :( i saw a very sad eye on the television today... it had contracted a disease known as the Retinitis Pigmentosa. here's the video. argh, another disease that might affect me!... oh wait! the superior brain tell me it's a genetic eye condition, passed down by the Human 's family. This means I won't ever get this disease! Phew.
But still, it breaks my heart (wait, do i have a heart?) cornea, to see a fellow eye with this illness. a person with this illness will have night blindness, slowly developing to tunnel vision, something like looking things through a tunnel. there are even some people who goes completely blind since childhood!
Retinitis Pigmentosa is caused by the genetic mutation of rhodopsin, that codes for the metazoan photoreceptor cells. It could also be caused by the breakdown of the function of rods and cones in the retina. the disease is usually caused by a large amount of disorders instead of just one.
to find out more about this disease, please view the video. it's very useful to learn more about things about other eyes! maybe I should start a charity for poor and sad eyes... (written by Ling Evan)
NoEyeDea@10:48 AM Wednesday, February 27, 2008
OH. MY. GOD!
The CRUELTY! The Brutality! Just the thought of it now makes me want to squeeze shut my pupil; get those eyelids to close tight and never open again!
Today, I witnessed the dissection of another eye! The Human and his companions were cutting up a fellow eye! If not for the educational; enrichment benefit, I think I would have just fainted. But really, to tell you the truth, it had really enlightened me about what the inside of an eye really looks like.
This was the eye before it was cruelly cut open:
(It gives me the creeps; to see the eye staring blankly, right at me...)
This is the back of the eye, where the optic nerve is:
And this is the eye...after it has been brutally taken apart.
The eye was...ugh. I'll just keep this short, I don't think I can carry on very long about this. After cutting away all the surrounding flesh and muscle, the humans first pierced a hole through the cornea; the front of the eye, which was filled with aqueous humour. A brownish, watery fluid was squeezed out through the hole. It was disgusting, but the Human kept looking. They later cut through the sclera, cutting the eye into two halves...the front and the back. Vitreous humour (transparent, jelly-like substance) supposedly filled the eye. I saw more brownish liquid flow out...and lens dropped out halfway...it was just nauseating (even for an eye with no stomach). They later observed the inside of the eye, and then the lens. The lens had a jelly-like substance around it, and it magnified the words beneath, but I guess I was already feeling quite light-headed by then. The lens I saw: With all these recorded down, I think I shall sign off. I really need to take a break, to calm down and think about other things... today has really shown me an irking side of humans, that in life, sometimes, to benefit one side, the other side needs to suffer... In this case that eye suffered so that the humans can know more about other eyes. I hope that this, in turn, will lead to a good cause...
Today, I mourn the death and the brutality done to that eye, and all other eyes that suffer the same fate. But I shall carry on with life. I will seek to learn as much as I can. I just hope...that tomorrow will be a better day. (written by Justin)
NoEyeDea@4:17 PM Tuesday, February 26, 2008 Hmm... Eye(I) had quite a meaningful day today.
I found out that the Human has been quite interested in the eye, recently... He has started to read more and more about the Eye. About me. And I myself have found out a lot, too, about myself.
Amongst the things the Human read, I actually saw an image of the structure of me! This is it: I am quite excited to know more about myself! I feel like I know so much now, just after one day of information. I never knew that I would have so many parts to my structure; there was a whole lot of words (most of which I don't really recall) including the Sclera, the Choroid, the Ciliary body, the Lens, the Suspensory ligament, the Aqueous chamber and Vitreous chamber, the Retina and the Optic nerve.
I realise that I knew so little before: I never would have thought that I am just like a baby - I'm being fed every moment of my life; kept alive by the Choroid which gives me nutrients and oxygen for survival! While the Choroid may seem more like my mother or caretaker, the Sclera is like a father-figure. He is tough, and an obvious white in colour. He covers me, to protect me from mechanical damage. Hmm... I guess that's all I can remember, for now...
Oh, wait, I remember the Optic nerve too! He's a busy guy, always transmitting the images of what I see to the brain. In a way he's a reporter, and the brain is the boss. After all, he controls what I see, or don't see.
Ah... I guess that's all for today. Learning more about myself is so interesting! I'm so excited to see what more I'll learn tomorrow!
Goodbye, then! Until tomorrow! (written by Justin)
NoEyeDea@4:17 PM Monday, February 25, 2008 Eye(I), am the eye, eye(I) behold all things within sight.
H(i)eye. This is an introduction to the eye that is me. I am a fifteen year old eye currently residing within the orbit of a fifteen year old skull of a Human that is fifteen years old. The all-controlling brain that sees all that I see and knows all I know dictates my every move. I am attached to a nerve cell that allows me to stay in constant contact with him. I am held in place by rectus muscles. Due to my relatively high standing, all that I see is viewed in high regard by the Human. I have an identical twin. We live next to each other :). He enjoys looking at shiny things. (written by Ling Evan, Zachary and DerHui) NoEyeDea@11:48 PM Hello reader;
Welcome to the blog of a humble eye. This is my very first post! I'll just keep this short because there is so much to see to, and I've got to get busy.
You can be sure that I'll update every once in a while; be sure to come back here to find out more about my everyday life; and more information about the body of an eye.
And this is the eye...after it has been brutally taken apart.
