Eyes are the most important organs of perception of the surrounding world. A person receives almost 90% of the information with the help of the eyes. If vision problems arise, this entails many difficulties, both domestic and social. But people have learned to cope with visual impairments with the help of glasses and lenses. The most popular lenses in Russia, judging by consumer reviews, are Optima contact lenses. 3 months - the period during which they can be used.
The structure of the eye
The eye is a very complex organ connected to the brain. Eyes allow you to see the world around you and perceive visual information.
- The cornea is the outer shell. It covers the front of the eye. It is a transparent film.
- Between the cornea and the iris is the anterior chamber of the eye. This space is filled with liquid.
- The iris is a closing muscle of a round shape with a pupil in the center. When lighting changes, the iris contracts and unclenches, therebychanging pupil size. The pigment in the iris is responsible for eye color.
- The pupil is the hole in the center of the iris. Reacts to light. The brighter the light, the narrower the pupil.
- The lens is an intraocular prism. It transmits light and is able to change its shape to focus on the subject.
- The vitreous body is a transparent substance in the posterior space of the eye, designed to maintain the rounded shape of the eyeball and regulate the metabolism inside the eye.
- The retina of the eye is equipped with light-sensitive photoreceptors and nerve cells. In these cells, a complex process of converting light photons into the energy of nerve tissues takes place.
- Sclera is the outer shell of the eye that does not transmit light. Anteriorly, it passes into the cornea. The sclera has six muscles that move the eyeball.
- Choroid - located on the back of the sclera, combined with the retina. The function of the shell is the blood supply to all structures of the eyeball.
- The optic nerve is an information intermediary between the eye and the human brain.
What is vision? Vision is a function carried by the eye. With the help of vision, a person studies and receives information from the world around him.
How does the eye work?
- Rays of light, reflected from objects, fall into the human eye.
- The rays pass through the layer of the cornea, then through the pupil into the lens.
- The lens and cornea refract the beam and create focus on the retina.
- Retina usingphotoreceptors convert light energy into nerve energy.
- Electrical nerve impulses travel through the optic nerve to the brain.
- The brain converts the received information into an image.
Due to the fact that a person has two eyes, he sees in a three-dimensional image.
Visual impairments
There are many variants of visual impairment. Simply, a person begins to see poorly, which causes a lot of inconvenience and encourages the purchase of Optima lenses, reviews of which made it clear that this is a reliable product.
- Myopia (myopia) - is a condition when it is difficult for a person to see objects that are at a certain distance from him. In this case, the light entering through the lens is focused not on the wall of the retina, but in front of it. Because of this, the image is blurry. The eyeball is elongated in myopia. Myopia occurs both at birth and gradually with age. Judging by the reviews of the Optima lenses, myopia is easily corrected with their help.
- Farsightedness (hypermetropia) is a condition when a person cannot see an object close to him. This is due to the fact that the light passing through the lens is not focused on the retina, but behind it. The eyeball is shortened in farsightedness. Temporarily farsightedness can occur in a child during elementary school. In adults, it begins around the age of 45. Without treatment, it becomes irreversible.
- Astigmatism - a condition in which a person sees forked outlinesobjects both near and far from you. This happens because the light passing through the lens does not converge to a single point on the retina, but forms several points. The cause of astigmatism is a violation of the cornea or lens.
Vision diagnostics
Before you sell lenses to a person who came for them thanks to reviews of Optima lenses, the doctor must diagnose his vision.
Visual acuity is checked using an ophthalmic table. Then, on professional equipment, the fundus is examined and the diameter of the iris is determined.
Methods of vision correction
There are many ways to correct nearsightedness or astigmatism.
Glasses are a fairly ancient method of vision correction. Glasses are easy to put on and take off, but they are uncomfortable during sports. To see something from the side, it is not enough to turn your eyes, you need to turn your head.
Laser correction - solves the vision problem once and for all. But this is a big risk of complications.
Contact lenses - allow 100% correct vision defects. Do not spoil the appearance. Easy to put on and take off. They require special care and regular replacement. Feedback on Optima lenses is positive about the possibility of replacing them quarterly.
History of lenses
The first contact lenses were invented in 1889. They were glassy and uncomfortable. In 1960, were invented and releasedhydrogel lenses, which were then upgraded to silicone hydrogel lenses in 1998. They were soft and breathable.
In 2012, hydrogel lenses were released that absorb moisture well and allow oxygen to pass through.
Description of "Optima" lenses
Bausch & Lomb, a popular manufacturing company, uses state-of-the-art technology to manufacture its products. Lenses "Bausch & Lomb. Optima", according to customer reviews from around the world, are the most convenient to use.
The main material for manufacturing is polymacon. Thanks to this substance, the surface of the lenses is smooth and even. These lenses are completely imperceptible in the eye due to their thinness. The eyes do not get tired because the lenses allow oxygen to pass through, do not absorb moisture and do not dry the eyes.
They are designed to be worn for a maximum of 3 months. Reviews of Optima lenses say that they have an affordable price and excellent quality. Optima lenses perfectly correct vision.
Positive qualities of "Optima" lenses from Bausch & Lomb:
- The edge is specially beveled to minimize friction on the eyelid when blinking.
- Thin and comfortable to wear.
- Do not dry on the eye.
- The ability to fit lenses to any patient.
- Stable shape - the lens does not wrinkle or stick together when putting on and taking off.
Positive feedback from doctors about Optima lenses is that they easily manage to teach patientsto use them. Patients' eyes do not suffer from friction or discomfort at all.
Features
Optima lenses from Bausch & Lomb are made of light blue polymacon A material.
They are breathable contact lenses ("Optima"). And customer reviews prove it.
Moisture content per lens is 38.6%.
The lens material is resistant to dehydration.
Possibility of correcting myopia with diopter from -0, 25 to -9 and corneal curvature 8, 4, 8, 7 and 9 mm.
The Optima lens diameter is 14mm.
These lenses should only be worn during the day and removed before bed.
One package contains 4 lenses, each in a separate sealed cell with a solution. Wearing them is designed for no more than 3 months.
The cost of one box with 4 lenses is about 900 rubles.
Customers leave feedback that Optima lenses are very comfortable to use without harm to eye he alth.
Probable Complications
Like any other intervention in the human body, wearing contact lenses can lead to a number of unpleasant consequences.
- Infections in the eyes caused by bacteria when putting on lenses with dirty hands or not following proper lens care.
- Allergy to the material of the lenses or the composition of the solution for themstorage.
- Prolonged wearing may cause corneal hypoxia.
- Corneal surface may be damaged due to careless handling of lenses.
In the reviews of the lenses "Optima. Bausch &Lomb" it is indicated that such consequences occur. To avoid complications, it is necessary to wash your hands thoroughly with soap and water before putting on and taking off lenses. The container must be changed each time a new solution is purchased. Let your eyes rest at night.
