Eyes are the most important of the organs of perception of the surrounding world. A person receives almost 90% of the information through the eyes. If problems arise with vision, this entails many difficulties, both domestic and social. But people have learned to deal with visual impairments with glasses and lenses. Judging by consumer reviews, the most popular lenses in Russia are Optima contact lenses. 3 months - the period during which they can be used.
Eye structure
The eye is a very complex organ connected to the brain. Eyes allow you to see the world and perceive visual information.
- The cornea is the outer sheath. She covers the eye in front. 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 circular locking muscle with a pupil in the center. When the lighting changes, the iris contracts and unclenches, thereby changing the size of the pupil. The pigment in the iris is responsible for the color of the eyes.
- The pupil is a hole in the center of the iris. Reacts to light. The brighter the lighting, 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 of the posterior space of the eye, designed to maintain the round shape of the eyeball and regulate the metabolism inside the eye.
- Retina - equipped with photosensitive photoreceptors and nerve cells. In these cells, the complex process of converting light photons into the energy of nerve tissues takes place.
- Sclera - the outer shell of the eye that does not transmit light. In front, it passes into the cornea. The sclera has six muscles that move the eyeball.
- Vascular membrane - located on the back of the sclera, is combined with the retina. The function of the membrane is the blood supply to all structures of the eyeball.
- The optic nerve is an information mediator between the human eye and brain.
What is vision? Vision is a function that the eye carries. With the help of vision, a person studies and receives information from the outside world.
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.
- Using the photoreceptors, the retina converts the energy of light into nerve energy.
- Electrical nerve impulses through the optic nerve follow 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 impairment
There are many options for visual impairment. Simply, a person begins to see poorly, which causes a lot of inconvenience and encourages you to purchase 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 examine objects located at a certain distance from him. In this case, the light entering through the lens does not focus on the retinal wall, but in front of it. Because of this, the image is blurry. Eyeball with myopia elongated. Myopia occurs both from birth and gradually with age. Judging by the reviews about Optima lenses, myopia is easily corrected with their help.
- Farsightedness (hyperopia) is a condition where a person cannot see an object close to him. This is due to the fact that the light passing through the lens does not focus on the retina, but behind it beyond. The eyeball is shortened with farsightedness. Farsightedness may occur temporarily in a child during primary school. In adults, it begins after about 45 years. Without treatment, it becomes irreversible.
- Astigmatism is a condition in which a person sees the bifurcated outlines of objects both close and far from himself. This is because the light passing through the lens does not converge to any point on the retina, but forms several points. The cause of astigmatism is a violation of the cornea or lens.
Vision diagnostics
Before selling lenses to the person who came for them thanks to reviews about Optima lenses, the doctor must conduct a diagnosis of his vision.
Visual acuity is checked using an ophthalmic table. Then, on the professional apparatus, the fundus is examined and the diameter of the iris is determined.
Vision correction methods
There are many ways to correct myopia or astigmatism.
Glasses are a fairly ancient method of correcting vision. Glasses are convenient to put on and take off, but they are inconvenient 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 problem with vision once and for all. But this is a big risk of complications.
Contact lenses - allow you to 100% correct visual impairment. Do not spoil the appearance. Easy to put on and take off. They need special care and regular replacement. Reviews about Optima lenses are positively expressed about the possibility of their quarterly replacement.
Lens history
Contact lenses were first invented in 1889. They were glassy and uncomfortable. In 1960, hydrogel lenses were invented and produced, which were then upgraded to silicone hydrogel lenses in 1998. They were soft and allowed oxygen to pass through.
In 2012, hydrogel lenses were released that absorb moisture and allow oxygen to pass through.
Description of Optima lenses
The popular manufacturing company Bausch and Lomb uses the most advanced technology to manufacture its products. Lenses "Bausch and Lomb. Optima", according to customers around the world, are the most convenient to use.
The main material for the manufacture is polymacon. Thanks to this substance, the surface of the lens is smooth and even. These lenses are completely imperceptible in the eye because of their subtlety. Eyes do not get tired, because the lenses let oxygen through, do not absorb moisture and do not dry the eyes.
They are designed to be worn for no more than 3 months. Reviews about Optima lenses say they have reasonable price and excellent quality. Optima lenses perfectly correct vision.
The positive qualities of the lenses "Optima" from the "Bausch and Lomb":
- The edge is specially beveled so that friction on the eyelid during blinking is minimal.
- Thin and comfortable to wear.
- Do not dry out on the eye.
- The ability to pick up lenses for any patient.
- Stable form - the lens does not wrinkle or stick together when donning and removing.
The positive feedback from doctors about Optima lenses is that they can easily teach patients how to use them. Patients' eyes do not suffer from friction or discomfort at all.
Specifications
The Bausch & Lomb Optima lenses are made from the light blue polymacon A material.
They are breathable contact lenses (Optima). And customer reviews of them prove this.
The moisture content in one lens is 38.6%.
The lens material is resistant to dehydration.
The ability to correct vision with myopia with diopter from -0.25 to -9 and curvature of the cornea of 8.4, 8.7 and 9 mm.
The diameter of the Optima lens is 14 mm.
Such lenses should be worn only during the day and removed before bedtime.
In one package are 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.
Buyers leave feedback that Optima lenses are very convenient to use without harming eye health.
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 lenses on with dirty hands or not observing lens care rules.
- Allergy to lens material or solution composition for storage.
- With prolonged wearing, corneal hypoxia may occur.
- Due to careless handling of the lenses, the surface of the cornea may be damaged.
Optima. Bausch & Lomb lens reviews indicate that these effects occur. To avoid complications, wash your hands thoroughly with soap before putting on and removing lenses. The container must be changed every time you buy a new solution. You should give your eyes a rest at night.