The human eyes, according to scientific studies, would have 576 megapixels if turned into a digital camera. Megapixel is a unit of graphic resolution used to illustrate the size of an image based on a photo taken from a camera phone or a digital camera. This describes how humans have better vision compared to hip and top rated cameras that are being offered nowadays. A human has a normal visual acuity of 20/20 which refers to their ability to distinguish details and sizes of a certain object based on what a normal person would see by standing 20 feet. However, due to unavoidable circumstances, the human eyes may also be damaged and acquire weaker perception.
Causes of poor vision
The eyes function well by getting assistance from rays of light, just as the camera needs light to focus on the film. The light then enters and gets thrown at the back of the eye called retina. This specific concept is coined as refraction. When normal vision weakens, its causes are most commonly known as refractive errors.
Refractive errors occur when the visual capacity of the eye is either too small or too large to focus light to the retina. These people normally suffer with blurry vision. Here is a list of factors that makes a refractive error:
- Myopia – a state of eyesight in which a person has the ability to see or distinguish an object at a short distance. This is due to the eyes imprecision to bend rays of light to a particular focus to view a clear object or image.
- Hypermetropia – a condition that describes the inability of the eyes to change focus and recognize details of close objects. This is why some people require the use of eyeglasses only while reading.
- Astigmatism – the failure of the eyes to focus a particular object to a sharp focused image on the retina. This is caused by an indefinite curvature in the cornea. Astigmatism causes adverse perception both in distance and near objects.
- Cataract – an age related impairment that causes clouding of the lens of the eyes. The lens of the eyes must be clear for the retina to receive light properly and this clouding, due to a build up of protein, halts passing of light through the lens resulting to poor eye vision.
The invention of contact lenses
The idea of contact lenses is endorsed by Leonardo Da Vinci in year 1508. However, he was not searching for methods to correct eye vision at the time. He was rather simply interested in the mechanisms of eye accommodation. He lay down this idea to alter correcting ability of the eyes through using water and glass. It was German inventors who had the initial plan to make actual lenses made up of glass. The lenses are precisely designed to cover the entire surface of the eye. From then on, further inventions of contact lenses were made to improve the visual experience of every individual, from plastic lenses, to soft contact lenses, GP contact lenses, to disposable lenses, silicone-hydrogel lenses, down to extended-wear or overnight lenses.
Eyeglasses vs. Contact Lenses
The usage of contact lenses got some individuals skeptic in terms of reliability. Yet, if you come to think of comparing contact lenses to its one great rival in terms of improving visual acuity, the eyeglasses, you would see how far contact lenses would turn up as debates rage on.
- First off, the eyeglasses are away from the eyes, compared to contact lenses in which a person can experience normal vision without something physically placed on top of his nose bridge and eyes.
- With eyeglasses, you are always aware of the lenses and the frames edge. With contact lenses, reflections and unnecessary obstructions are impossible.
- Changes in temperature can fog up the lenses of eyeglasses. People who wear contacts never experience such dilemma.
- Eyeglasses have the tendency to gain dirt and scratches which ends up being impaired as well defeating ones purpose of getting clearer vision.
- Contact lenses cover the entire eyes unlike that of a pair of eyeglasses that causes you to recognize hardly what is on your peripheral view. Contact lenses move around and make it seem normal as a person with 20/20 vision sees.
- Glasses need to go together with ones outfit. Contact lenses match whatever kind of outfit you wear.
- Eyeglasses require constant cleaning especially when there is rain, snow, dust and other things that make it appear dirty. Worse is that it also can be scratched and damaged by the lone idea of cleaning.
Things to remember when wearing contact lenses
Despite the rewards of purchasing contact lenses, it also has certain disadvantages, one of which is a contact stuck in eye. This is first and foremost the common reason why people do not consider purchasing lenses first as an option on how they could enhance their vision. This possibility can happen, but here are superb tips you may consider to remedy this kind of situation:
- Do not panic. You have to keep calm and breathe as much air as possible so you can think of possible methods to resolve such dilemma. Panicking does not do any good. You will only end up being miserable and not being able to help the situation. So much so as adding more fuel to your misery.
- Try every possible way you can imagine. You can keep trying up until you get that piece of eye contact lens but make sure you do it with ample subtlety and by refraining from exhausting it too much. The eyes may get red and sore. Remember, you got contact lenses to fix your visual experience. Exhausting your eyes will only provide worse circumstances than a contact stuck in eye.
- Assess what is really happening in front of the mirror. Look carefully and examine the cause. Is it the lens position? Was it broken into two inside the eye? If you are not certain about your assessment, try to look for someone who can also spot the situation.
- If you noticed that your eye is simply dry, grab the eye solution and drop a few to get the contact stuck in eye to come out. Try to blink several times and then proceed to the basic steps in pulling out eye contacts. If the solution cannot solve the problem, take it easy. Put your feet up first and then do the same procedure later on. You can try putting some more solution and leave it for a while to soak the area. Eventually, this helps contact easier to be extracted from the eye.
- Once the lens is located in the area beneath the eyelids, try to pinch the upper lashline and then pull the contact stuck in eye to the opposite side. This helps you easier for the eye to let go of the contact stuck in eye.
- Not being able to fix the situation, you can always talk to an eye specialist to give you further assistance regarding the matter. This problem is common and this definitely has been studied over for a while now. A contact stuck in eye will be remedied in no time, especially when you consistently follow the correct steps.
Indeed, the contact lenses do help in allowing people to feel normal even just by the simple means of viewing certain images around them. The invention of contact lenses came about for a very good reason. While eyeglasses are still preferred by many, there is no doubt that contact lenses have tremendous impact as well impact that eyeglasses alone could not match.