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Change of hours: what consequences on my vision?
The third eye
" Never two without three "
binocular vision of man is one of the most perfected in the animal world. Yet the 2-eye system may not have always guided human sight. Like all vertebrates, we have an epiphysis or pineal gland located between the two hemispheres of the brain which is the size of a pea .
According to some scholars, this epiphysis is all that remains of the third eye of our distant aquatic ancestors which would have calcified. It is possible that this useless third eye has acquired secretory functions over time. This gland secretes hormones regulating circadian rhythms (biological clock).
This third eye still exists in some animals. This epiphysis grows forward to form a median, single eye in the case of the shark or batrachians. In the lizard, it is a perfected eye with 5 layers of retinal cells and a macula.
Besides these biological notions, the third eye has an esoteric dimension. It is found in many Eastern civilizations (Buddhist, Taoist…), it is the psychic center other organs and allow meditation.
For Descartes, in the 17th century, it is "the seat of the soul"
blue light
There are 2 kinds of blue light : natural blue light emitted by the sun and artificial blue light emitted by LEDs (Visible Light Energy).
Solar blue light is one of the elements of the light spectrum; it is the light composed of UV and blue located at the border of the visible and the UV. This is not very harmful for a healthy eye and for wavelengths close to yellow even beneficial for our health.
On the other hand, artificial blue light is dangerous for the eye . We are all more and more confronted with it with technological development; this is the light emitted by a large number of everyday devices: PCs, flat screens, smartphones, tablets, tom-toms… and also by public and domestic lighting. Indeed, for economic and durability reasons, LEDs are replacing incandescent and halogen bulbs, etc.
All of these modern light sources emit a high proportion of blue light radiation called HEV (High Energy Visible).
Many studies have shown that even low sustained but repeated exposure is harmful; it is the cause of various visual disorders or genes such as tingling eyes, headaches and can also cause damage to the ocular annexes (lens, retina, eyelid, etc.) such as premature cataracts, AMD, etc.
The impacts of this light on humans are multiple because daily exposure to these devices not only damages our sight but also affects our circadian rhythm, that is to say our biological clock . These wavelengths of light stimulate the hormones of awakening and looking at your iPad, tablet or console at night can prevent you from falling asleep even when you are tired .
On the other hand, the strong stroboscopic effect (the large fluctuations in visually imperceptible light intensity) is the cause of glare .
The negative effects of LEDs are greater in children, the elderly, people undergoing photosensitizing medical treatment, aphakic people, etc.
This is why it is recommended to limit exposure to these light sources, especially among people most at risk and in the evening, then to protect yourself with specific anti-blue light glasses which protect your eyes from this radiation by absorbing a part of blue light .
Blue light blocking glasses for better sleep
Sleep is one of the essential activities of our existence; whether physically or psychically we need it for a serene and balanced daily life.
Modern life is more and more dynamic, activities are multiplying and very often we postpone bedtime to go out, read, work, watch television...
When we spend our evenings watching television, our tablets or smartphones, our computer screens, our body absorbs a large amount of blue light .
The blue light emitted by all these devices is harmful for various reasons.
It acts as a stimulant by stimulating us and increasing our attention span during the day and at the end of the afternoon. The artificial blue light thus absorbed can have a negative effect on our circadian rhythm, our biological clock.
When night falls, our brain naturally produces a natural chemical “ melatonin ” which signals to our body that it is almost time to sleep. Studies have shown that short wavelengths of artificial blue light (emitted by LEDs for example) inhibit melatonin production . This is why we have trouble falling asleep or experience insomnia.
In order to significantly reduce these inconveniences while continuing to use modern technologies, there is a simple and elegant way: blue light blocking glasses .
These glasses are equipped with specific cool blue lenses, presbyopia glasses or glasses without correction for the youngest, they are designed to block UV and blue light emissions from LEDs, computers, telephones...
Sweet dreams with your Cool blue sunglasses
