The brain controls what we see since it is the optic nerve behind the eye which is linked to the brain which allows us to reconstruct the images we see.
But our brain is sometimes wrong ! Whether deceived by optical illusions , subliminal images , camouflage , mirages , trompe - l'oeil or a phenomenon known in ophthalmology: the blind spot , we will reveal everything to you.
What is an optical illusion?
It is a visual perception different from reality, a mental distortion of an image due to an erroneous interpretation of the brain. For example: can you tell which way this metro goes?
The subliminal image is an image that is undetectable to the naked eye but that the brain would still process . For example, in the middle of a film, an image can be slipped in for such a short time that we wouldn't have time to see it, yet the brain would see it and integrate it into our subconscious.
What is camouflage?
Camouflage is a technique aimed at creating an optical illusion phenomenon in order not to be seen . Chameleons are the kings!
What is a mirage?
It is a phenomenon of reflection of light coming from a region where the air is cool and penetrating into a region where the air is warmer. Thus light rays become curved. The objects are coupled with an inverted image suggesting a reflection on a body of water. One can observe mirages especially in the deserts or on the roads.
What is a trompe l'oeil?
It is a painting which gives the illusion of reality , by an excellent rendering of the relief of the object , this thanks to a play of shadows and lights. It is an art known and practiced since antiquity.
What is the blind spot?
It is the only point on the retina where we cannot see , due to the absence of photoreceptors. It is where the optic nerve and blood vessels leave the eye.
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A few days after the start of summer, on June 27, in the United States and Canada, National Sunglasses Day is celebrated each year. This day was created by the Vision Council which dedicates a site to it nationalsunglassesday.com
Why a National Sunglasses Day?
This day is a simple and fun way to remind the American population of the importance of sun protection . It is necessary to protect yourself from glare, solar and UV radiation as well as the dangers associated with exposure to the sun. UV radiation (especially UVA) is harmful to the eyes and the skin, which is why it is strongly recommended to wear sunscreen to prevent burns, degeneration, cancer, etc.
During strong and long exposure, UV can cause problems in the white of the eye, keratitis, cataracts, retinal damage... In addition, sunscreens are an active anti-wrinkle! Your protected eyes are relaxed; fewer wrinkles and fine lines appear at the corner of the eyes. In addition, by blocking UV rays, your eyelids, whose skin is thin and sensitive, are protected, less risk of cancer.
Which sunglasses to choose?
Here are some tips for choosing the best sunglasses:
- Check that they provide good UV protection, 100% UV or UV400 protection
- Choose a category suited to its use: cat.4 for high mountains or sailing, cat.2 for moderately sunny weather... For summer activities, driving, cat.3 sunglasses are ideal and master key.
- Prefer a pair of comfortable sunglasses that do not slip, large and covering.
- And of course opt for nice looking glasses!
Good food for good eyesight!
We think of paying attention to what we eat to improve nail growth or to have shiny and healthy hair, but our eyes are often neglected!
Yet they also require that we take care of (y)them , starting with what we put on our plates.
A good diet makes it possible to avoid all sorts of inconveniences due to certain deficiencies , such as AMD (age-related degeneration), glaucoma or quite simply to avoid worsening an already existing sight problem .
To begin with, a balanced and varied diet helps maintain a healthy overall lifestyle.
Here is our pick of the best foods for healthy eyes:
These are polyunsaturated fatty acids that are necessary for the proper functioning of the human body but that it cannot produce by itself. They must therefore be found in the foods we eat. They are present in large quantities in nuts, chia seeds, flax seeds, in shrimp and in fatty fish such as herring, salmon, sardines, etc.
Vitamins A, B, C and E:
- Vitamin A is one of the molecules that make up the retina , it helps protect the cornea. It becomes very useful during conjunctivitis, glaucoma, cataracts or major vision problems , indeed a vitamin A deficiency would cause total blindness .
Vitamin A is found in calf's liver, carrots, broccoli, spinach...
- Vitamin B improves eyesight and prevents its decline , especially the "sub-vitamin" B2, riboflavin.
It is found in abundance in foods of animal origin such as cheese, eggs, meat or fish. It is also found in green vegetables such as spinach, asparagus or even in cereals or brewer's yeast.
- Vitamin C plays an important role in reducing the risk of cataracts and AMD . Indeed, the retina and the lens are bathed in a fluid with a very high vitamin C content . It is therefore necessary to ingest vitamin C to allow a good balance.
Vitamin C is easy to find in large quantities: in citrus fruits, red fruits such as blueberries or blackberries, broccoli, peppers...
- Vitamin E would have a protective effect against AMD and cataracts . It would reduce the progression of these disorders .
A daily dose of it by eating for example almonds, hazelnuts, sunflower seeds, avocados, etc. would provide protection against these diseases.
It is a very good element in the preservation of your sight and the good health of your eyes , it is found in cocoa, wheat germ, eggs, cashew nuts.
In order to have healthy eyes, integrating these foods into a balanced diet is the solution. When the good weather arrives, it is easy to find many fresh products rich in vitamins and minerals. It is also possible to take food supplements to complete a varied and balanced diet. But like everything, be careful with the doses taken, an overdose would cause negative side effects.
Foods to avoid:
A diet too rich in omega-6 including too many vegetable oils, seeds, eggs or certain meats would tend to cancel the effects of omega-3.
Processed foods of industrial origin which have little nutritional value and therefore no vitamins, minerals, necessary for the functioning of the body in general.
An unhealthy body will lead to vision problems as you age.
The aging of the eye, a subject that concerns us all!
Our tissues and organs age . Unfortunately, the eye does not escape this harsh reality. Today it is important to protect his eyes against the ultraviolet rays , blue light and for some infrared . The aging of the eye is a subject that concerns all individuals, it is necessary to have ophthalmological and optometric check-ups once a year.
The aging of the lens
The lens is simply the lens that sits inside the eye, just behind the iris (see diagram). This one deforms by pressure from the ciliary muscle. This deformation allows to have a clear vision, it is the accommodation. The lens becomes less and less flexible over the years and this leads to the symptom of “arms that are too short”, presbyopia.
After Presbyopia, it is the transparency of the lens which is reached, the crystalline lens becomes opacified especially with exposure to the sun and blue light: this is the cataract .
The aging of the retina
The retina and its central part, the macula , allows to see the details, it is what allows the individual to be able to read and recognize shapes and faces. The aging of this can be very disabling, this is called age-related macular degeneration: AMD
The aging of the optic nerve
The optic nerve is simply the " messenger », the one who will transmit the visual information from the eye directly to brain . With age there is a decrease in the number of nerve fibers originating from the retinal ganglion cells. This reduction in the fibers of the optic nerve is accelerated in the event of chronic glaucoma, a disease whose incidence increases with age.
Aging tear glands
The eye is permanently soaked with tears secreted by the lacrimal glands . The secretion of his tears decreases with age, which can lead to eye dryness .
Aging tear ducts
The tears are processed by lacrimal ducts to the nasal cavities. With age, these pathways can shrink and/or clog . This results in individuals with intermittent or permanent tearing. If this discomfort is too great then it is possible to go through the surgery .
The vitreous is a transparent and homogeneous gel inside the eye. With age, certain parts liquefy, condense... Which leads to the appearance of " flying flies 'or' flashes of light ".
The eye by its complexity is a marvel of nature . It captures light, analyzes it and interacts with its environment. It is necessary to preserve it and keep it healthy for as long as possible. Because sight is life , through this article we will explain to you how OMEGA 3 play an essential role in preserving our vision. Indeed, food hygiene and the right balance between OMEGA 3 and OMEGA 6 make it possible to protect and maintain vision over the long term.