People suffering with vision problems alreadylong known contact lenses, which are an alternative to glasses. With lenses made it easier to engage in active work, they can easily pick up, even if the eyes have different degrees of visual acuity .but everything is so perfect? What is better to choose lenses or glasses
Contact lenses and glasses, history of occurrence
Appearance of the first optical devices associated withthe name of Leonardo da Vinci, who understood the action points and lenses in principle. After him questions optics involved many Italian scientists. First, people wore monocles and pince-nez, but after the first World War, there were glasses.
Wearing contact lenses takes us back to the 19thcentury. Blown glass 2 mm thick and 30 mm in diameter, it looked as if the lens. In the forties of the twentieth century, people became acquainted with lenses made of plastic. But I do not have to talk about their convenience, since they do not allow oxygen and were very large. It was only in the mid-twentieth century scholar of the Czech Republic set up a special hydrogel polymer, from which the modern contact lenses. Now contact lens- are small bowls (lenses) worn directly on the eye. They are made of a material capable of transmitting oxygen and perform optical functions.
The opinions and versions on the use of contact lenses and glasses
There are different opinions on the use of contactuse of lenses and glasses. For example, doctors say the following: a man with sunglasses with a badly chosen diopters, will face the problem of falling. It will inevitably fall on average by 5% per year. And if you choose the wrong lens and does not comply with hygiene regulations in contact with them over time, there will be unpleasant eye diseases such as conjunctivitis and corneal erosion. In any case, you need a competent selection of glasses or lenses at the ophthalmologist. And to understand that better, look at the main »pros» and »cons» in the use of glasses and lenses.
Arguments »for» the use of points:
-Quickly he donned quickly removed;
-Do not require special care;
-No contact with eyes and mucous irritation potential, respectively;
-Can favorably complement the image of a business person;
-Protects specks from a direct hit in the eye.
Arguments »for» the use of contact lenses:
viewing angle is wider than that of the points;
-zrenie more natural, including peripheral;
-komfortno wear in all weather conditions;
-can be used to change the color of the lens and the image;
-Easy to use during active sports;
Arguments »Against» the use of glasses:
-nedostatochny viewing angle;
-svetootrazhenie and fogging;
-Easy to lose, forget and break;
-iskazhёnnoe perception of surrounding objects;
- The mob rubs and leaves traces on a place of landing of fetters. However, you can not avoid this problem if you acquire a brand frame - for example, Silhouette;
-not always a pleasant change in appearance.
Arguments »Against» the use of contact lenses:
-nelzya carry children up to 12 years;
-not always the oxygen supplied to the eyes in sufficient quantities;
-vospreschaetsya worn during colds, allergies, and when you are in a very dusty place;
a lens of periodically need to change;
a sufficiently high price.
One can certainly say that the lenses are notabsolute replacement points. The health of our eyes depends on an adequate supply of oxygen to the cornea, so you need to take breaks from wearing contact lenses. But at the same time to correct vision in certain forms of astigmatism (blurred images due to changes in shape of the cornea) and angiopathy (loss of blood vessels in the retina of the eye) is possible only with the help of lenses.
In any case, persons with imperfect vision advised to wear the lenses and sunglasses. It all depends on the state of human health, its location and type of activity.
