Eyes have more than 2 million parts, ranking the second place among the most complex organ of the human body after the brain. The primary function of the eye system is view, considered by many the most important human feel.
source: healthlifemedia
Eye diseases can affectthe eyeball , optic nerve or annexes eye (conjunctiva , eyelids, muscles and nerves oculomotor ).
They can be of different types:
- Birth defects : a change caused by genetic origin in the development of the visual system, or a condition contacted in the womb;
- Inflammatory conditions: the surface of the device affects the eye ( conjunctivitis , episcleritis ) or inner membranes ( uveitis , choroiditis);
- Glaucoma is a condition in which the intraocular pressure, too high, is accompanied by alterations of the optic nerve;
- Vascular diseases are of serious concern especially when the optic nerve or retinal vascularization (occlusion of the central retinal artery or vein);
- Degenerative diseases may be related to aging or hereditary abnormalities of the eye (macular degeneration related to age, cataracts called "senile");
- Oculomotricity disorders: represented mainly by oculomotor palsy (ophthalmoplegia) and by strabismus .
source: thehumanevolutionblog.com
Miths
Myth: Carrots improves vision.
True: Carrots contain significant amounts of vitamin A , an essential nutrient that helps maintain visual acuity.Eating carrots body ensures a small amount of vitamin A, but this is not the only food that contains vitamin A.
Other food sources of vitamin A are: cheese, milk, egg yolk and liver.
Myth: Watching TV at a short distance affect vision.
False: Looking close to the TV can cause headache, but does not lead to the emergence disorders
Myth: Reading in a lit room to diffuse weakens.
False: As with almost the way you watch TV, dim light can lead to headaches or in the worst case lead to the appearance of blurred vision for a few seconds, but it does not weaken view.
Myth: The glasses and contact lenses to weaken and the eyes become addicted to these instruments.
False: Visual acuity is reduced because contact lenses , which are recommended after a medical checkup. Vision problems occur due to age, presence of certain diseases, local trauma but because of a previous medical prescriptions.
Myth: Children may be treated with strabismus.
True: In children, strabismus , the medical term that denotes eyes cross, is treatable. It should be mentioned that this disease is not treated by itself, but with the help of medical treatments, and the older the child is less than the more chances of cure are higher. For this reason it is very important that the baby be taken from time ophthalmologist; first visit will be made are still as infants and then at age 2 years.
Myth: The enlightenment baby room with a lamp at night leads to occurrence of myopia.
False: It is believed that the room illumination at night is a risk factor for the occurrence of myopia , however, it is noted that this claim is not supported scientifically. Backlighting helps small nursery to learn to focus and develop coordination skills eyes when awake.
Myth: Looking at the sun without eye protection is impaired eyesight.
True: Watching the sun with the naked eye not only causes headaches and temporary discomfort to the eyes but causeseye damage . Any exposure to sunlight cumulative effects of UV radiation on the eye. UV exposure has been associated with the occurrence of the following vision problems: macular degeneration, retinitis solar and corneal dystrophies. The most dangerous is the exposure of the eyes during solar eclipses, when the brightness of the sun is hidden, invisible but dangerous rays and permanently affecting the eye is not reduced.
Myth: artificial sweeteners increase eye sensitivity to light.
True: By using certain artificial sweeteners such asc yclamate , sensitivity of eyes to light is increased. There are other factors that have the same effects on the eye, among them there are: antibiotics , birth control pills , drugs to treat hypertension , diuretics and medications recommended for people with diabetes.
Bibliography:
https://nei.nih.gov/healthyeyes
https://www.msdmanuals.com/home/eye-disorders/biology-of-the-eyes/structure-and-function-of-the-eyes