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Vision, physiological, mental process of the formation of ideas about the external world. The necessary conditions for vision are the passage of light rays through the transparent refractive medium of the eye, on the retina of the image of the object and the excitation of the endings of the optic nerve (cones and rods of the retina) by the incident light.
Visual sensations can also arise under the influence of direct light stimulation of the optic nerve; light sensations also arise due to mechanical reasons: the pressure of the eyeball, electric current, but for a clear vision, the participation of the refractive media of the eye (dioptric apparatus) and irritation of the endings of the optic nerve in the retina are necessary.
The dioptric apparatus of the eye (cornea, aqueous humor, lens and vitreous humor) acts like a photographic obscura camera. To adapt to obtaining clear images on the retina from objects located at far and near distances, there is a special muscle that regulates the curvature of the surfaces of the lens and, therefore, brings closer or further away its focal length (eye accommodation).
The ability to accommodate has limits and individual differences and deviations. The process of converting light stimuli and images of the retina into visual impressions in the corresponding centers of the brain is beyond our experience.
Sitting close to the TV is harmful to your eyesight. There is no evidence that it is harmful to your eyes. You need to sit where it is most comfortable. Your eyes can get tired from sitting in front of the TV a short distance if the light in the room is too dim.
Reading in the dark is harmful to your eyesight. Reading in dim light can cause fatigue in the eyes, but it is not harmful.
Certain exercises can improve your vision. Considering everything that surrounds us is all that is necessary to keep our eye muscles in good shape. Any other effort is a waste of time and does not bring any benefit.
The eyes can "wear out". Eyes are not light bulbs. You cannot "wear out" them by actively using them.
Older people get better vision as they "get second sight." Second sight refers to a person's ability to see better. The reason for this "improvement" of vision is that the lens of the eye changes due to the growing cataract.
Frequent sex (or masturbation) can lead to blindness. Sexually transmitted disease syphilis, if left untreated, can lead to blindness, dementia and death. This is how myths are born.
Wearing glasses is harmful to your eyes. In fact, in order to see well, you need to choose glasses from a doctor. Glasses that don't fit you won't harm your eyes.
Blind people have a sixth sense or some kind of talent. Most people with excellent eyesight do not pay attention to their feelings. Blind people have worked hard to develop other senses. This is not a sixth sense. It is hard work and practice.
There is no need to test your eyesight until you are forty. Everyone should have regular eye exams, even if there are no complaints. There are eye diseases that are treatable. Glaucoma, for example, is one of those that appear before you turn forty.
Doctors can do eye transplants. It is not possible to transplant the entire eye. It is connected to the brain by optic nerves. If you cut it off, you will not be able to connect again. When doctors understand how to do a brain transplant, they can transplant eyes.
Scientists have created a "bionic eye". Researchers have been working on a microchip to replace damaged retinal cells in central vision. Other scientists have tried to figure out a way to connect a camera directly to the brain. The eyes and brain work differently from a computer and a video camera. Even if you can create a bionic eye, you will not be able to connect it to the brain.
The sun is not harmful if you are wearing sunglasses or if you have developed squint. The sun's ultraviolet light can damage the cornea, retina, and lens. Looking at the sun, you may experience not only a headache and temporary distortion of vision, but also a permanent dysfunction of the eyes. Never look at a solar eclipse. Direct sunlight can render a person blind in less than a minute.
Nothing can be done to prevent vision loss. Regular eye exams and careful eye care are essential to preserve your main sense organ. If you have any vision problems, you should immediately contact an ophthalmologist. If the disease is detected at an early stage of development, then it can be either prevented or slowed down.
Glasses can impair vision over time. Wearing glasses will never impair your eyesight. In fact, it's all about habit.
To improve vision, you need to eat carrots. Only a small amount of vitamin A in carrots is needed to maintain good vision. Excessive use of it can be detrimental to your health.
Exercise for the eyes is beneficial for improving vision. Typically, these exercises are prescribed for children aged ten or adolescents with convergence (abnormalities in which patients cannot focus on close objects). Indeed, this deviation is corrected with the help of gymnastics, but it cannot be unequivocally stated that all her exercises are equally useful. Exercising the eyes will certainly not get rid of glasses.
If you use glasses for a long time, your vision will deteriorate even more. Doctors say that if the glasses are selected correctly, then vision will not deteriorate at all and will not acquire dependence on this accessory. The myth is based on the misperception that if you constantly wear glasses or lenses, the very physiology of the eyes will change. Eyes can deteriorate with age, so someone who needs glasses at 50 will still need them 10 years from now, regardless of whether they use them or not. With age, most people need more and more strong glasses, this is usually inevitable.
If you do not wear glasses prescribed by a doctor, then vision will deteriorate rapidly. Not at all, in this case, the world will simply be defocused, and the colors may acquire an impressionistic shade. If you try to focus your gaze without glasses, then your eyes, of course, will strain, but not so much that it becomes harmful. Glasses will simply help you see the world around you better.
With age, strabismus in children goes away. First of all, it is worth noting that children's strabismus requires treatment in any case, you should not wait for it to go away by itself. If adults notice this deviation, if it seems to them that the child often rubs his eyes, then they should immediately visit an ophthalmologist. If you go to a specialist late, then the treatment may not help. During the formation of vision, there are certain cells in the retina that are responsible for fixing the image and its three-dimensionality. If you do not stimulate them at an early age, with strabismus, then they stop developing altogether.
If the child does not have obvious eye problems, then you can not go to the ophthalmologist as planned. It is considered mandatory for every child to visit an ophthalmologist once every three years. This will help eliminate the possibility of developing strabismus and amblyopia. The medical history of the baby's immediate family members can also affect the time of the first visit to the doctor.