Optical Lenses & Eyes

Archive for the ‘contact lenses’ Category

It has alone been afresh that a being with amaurosis has been able to abrasion acquaintance lenses. Amaurosis is a action of the eye area the adherent of the eye itself is not round. The eye is added egg-shaped shaped, added like an egg or if you can brainstorm the actualization of a football. Acquaintance lenses had consistently been fabricated alone in the annular actualization which did not fit the needs, and there were no amaurosis acquaintance lenses.

Due to the wonders of medical science, an amaurosis lens was developed, abundant to the contentment of abounding humans who accept astigmatism. Humans accept flocked to their specialists to see if absolutely they are now candidates for these new acquaintance lenses. To the contentment of many, they are acceptable to now abrasion contacts.

The amaurosis acquaintance lens is a abnormally formed acquaintance lens. In appearance, it still looks like the acceptable annular lens that has been beat for years. However, if advised carefully beneath a microscope, one can see that the lens has three to four layers, or affable changes in the allocation of the lens. This is what is authoritative the allowance for the astigmatism. As the eye looks a little to the larboard or right, and goes over that ellipsoidal curvature, the eyes of the acquaintance lens is able to accomplish allowance for that change.

Those who are using contact lens for the first time will have a few practical questions regarding the proper way of wearing it and the usage. Here are some tips that will answer your concerns.

The Right Way of Wearing Your Lens

The best way to place your optical lens is by sticking it to one of your fingers to form the cup that will assume the bulge of your eyeballs. Then, hold it directly against the front of your eyes to you can see the side of the cup. If the edges are flaring out, then it means you are doing it the wrong way.

If you are using the aid of a handling tint, use your fingertip to hold the lens. You will find that the tint of the lens’ edge is very visible, which isn’t the case if the lens is inverted.

Placing Your Contact Lens

Before applying the lens into your eyes, make sure that your hands are properly cleaned. Avoid using products that might adhere to the surface of the lens and could damage your eyes when used.

Before using, you can try to shake the lens case gently to loosen up the lens in case it gets stuck inside. Never attempt to pull it out using your fingers as it can damage the lens. Once loose enough, rest the contact lens in the palm of your hand and rinse it with the lens solution. After that, you can place it on a dry middle or index finger. Use your other hand to gently pull up your eyelid and pull down your lower lid. Look upward so you can properly position the lens. Make sure to place the lens on the white of the eye, nearest your ear. Allow the lens to settle by slightly rolling your eyes and blinking.

Removing Your Contact Lens

As with placing, you must also wash your hands thoroughly before removing your contact lens. Then, look upwards as you would when applying it. Pull down your lower lid so you can gently maneuver your finger inside the eye to remove the lens. Use your index finger to slightly pinch at the lens and lift it off slowly. It is highly recommended that you clip your nails to avoid hurting your eye in the process as you might accidentally hit the white of the eye instead of the contact lens in the process. Basically, it is all just a reversal of the process of applying the lens into the eye.

There are several devices sold for removing contact lens such as “plungers” but it is very easy to do on your own, provided that you properly follow the steps provided.

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Glasses inconvenience brought to CONTACT LENSES correction development, and not only from plastic which can be worn under the eyelid, directly on the ocular eye. These CONTACT LENSES minimize radically the breaking risk, which is always present at normal glasses, because the contact lens is being protected by its shape, as the eye by skull shape. Nowadays lenses cover only the eyes cornea. So called soft CONTACT LENSES are used frequently and they are formed from a soft plastic, which casts on the eye.

Contact Lens History

The first lenses are from the time of Greeks and Romans, where glass spheres were filled with water. Those lenses filled with water were used as glasses with fire. The real glasses didn’t appeared in classic times; they were manufactured for the first time at the end of the 13th century, in Europe. The process of lenses fabrication didn’t changed too much since the Middle Ages, beside the utilization of grinding degree, introduced by Isaac Newton.

The recent developments of plastic and special processes for modulate them, brought to the increase of lenses production. Plastic lenses are easier, cheaper and less fragile then the ones from glass.

In 1286, the Englishman Roger Bacon registered a declaration about optic lenses utilization. Glasses were first used in Italy, Europe. Starting with the 15th century, the request for glasses increased so that in 1629 had become a real business.

The first pair of bifocal glasses was made by Benjamin Franklin in 1760.

Lenses are used in optical systems from glass or any other transparent substance, with a form that allows refracting the light of any object of real or virtual shape and lenses from glasses are used in medical purposes.

Lenses are also used at microscopes, telescopes and other optical tools.

Lenses producing

In most cases, lenses are formed from a kind of superior quality glass. This is called also optical glass, which has no internal defects, air bubbles or other flaws. The process of making a lens from a glass block implies a few operations. The first step is tracing a shape of lens on the glass block. After its cut, it’s pressed with a piece of thin metal, whose edges are strewed with diamante powder.

The piece of glass it’s brought to its shape by cutting it with an iron plate covered with a mixture of water and adhesives.

For obtaining the lens surface are used concaves or convexes tools, loaded with abrasives.

The finishing process of the lens is the grinding, and after that, the last thing is to cut from the edges, so that they will be equal.
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