Journal of Hospital Infection誌に発表された論文によると、重症急性呼吸器症候群(SARS)、中東呼吸器症候群(MERS)、風土性ヒトコロナウイルス(HCoV)など、新型以外のヒトコロナウイルスに関する22例の研究分析で、ウィルスが「金属、ガラス、プラスチックのような非生物表面上で9日間する」可能性、より具体的には「2時間から9日間」感染力を維持する可能性を研究グループが明らかにした。（参照）
“Half the world’s population (nearly 5 billion) will be short-sighted (myopic) by 2050, with up to one-fifth of them (1 billion) at a significantly increased risk of blindness if current trends continue”
A study by the team of the Opthalmology Department of Keio University school of Medicine in Japan announced that Violet Lights may have the effect of suppressing myopia progression(myopia control).
If you are not aware of this study’s results, you need to be careful!
Only being known the result can be danger.
Here is why, so you can be aware.
What Is Myopia, Nearsighted Or Shortsighted
Focus And Retina
What is myopia?(meaning or easy definition)
As you may know, myopia is known commonly as “nearsightedness” or “shortsightedness,” which is one of the conditions generally considered among refractive errors.
Normally, the light comes into your eyeball and the focus reach to retina, and then you can see what you want to see without blurred vision.
Proper focusing of the retina is crucial.
If you have myopia, the focus in your eyeball doesn’t reach to retina due to the extension of the depth of the eyeball, and that’s why when you see into distances, you have poor vision.
Imagine a magnifying glass.
Focusing on a paper can cause fire to break out.
That shows how much energy is contained in focusing.
Focusing at the retina creates the full energy to see clearly.
You Need To Know
Definition Of Ultraviolet
What is ultraviolet light(or rays)?
Ultraviolet light(rays) is a type of electromagnetic radiation which comes from the sun and is transmitted in waves or particles at different wavelengths and frequencies.
Let’s see the definition of ultraviolet which is concluded by CIE( Comision Internationale de I’Elairage: International Commission of Illumination).
Although internationally this broad range is defined, some people use a different broad range, especially UVA.
This broad range is called invisible light.
How the study went?
Study on Chicks
In short, according to research, multiple studies had shown outdoor activities could lead to the suppression of myopia progression, though animal studies and epidemiological studies, however nobody identifies what leads to suppressing myopia.
They focused on violet light, much of which is included outdoors.
The results show they conducted on 4 types of chicks’ eyes, which induced myopia by covering with plastic goggles were exposed by violet light (average of myopia progression was to around -5D) which induced myopia by covering with plastic goggles weren’t exposed by violet light (average of myopia progression was to around -15D)
which didn’t induce myopia were exposed by violet light. (Average was no myopia progression) which didn’t induce myopia weren’t exposed by violet light. (to around -1D)
They concluded violet light increase the expression of a gene known as EGR1(Early Growth Response 1), which is responsible for preventing myopia in chicks.
And I agree this result can be preventing myopia progression in chicks, but you need to listen carefully because 360〜400nm wavelength of violet light which they call is actually same as we call it UVA broad range.
Violet Lght Exposure And Children Wore Contact Lenses
Clinical trial for humans wore contact lenses
Secondly, as clinical trials, they compared different types of contact lenses that were worn by nearsighted children from age 13 to 18.
They were further divided into two groups; children who wore violet light transmitting (VL-T) contact lens (116 people 116 eyes) and children who wore violet light blocked (VL-B) contact lens (31people 31eyes).
The result revealed there is a significant difference between VL-T lens and VL-B lens.
The result showed how different axial lengths were, in spite of the fact that they showed its diopter in the chick’s case.
You know why?
Because the differences are too small to show its diopter.
The changing shape of the eyeball also puts strain on the capacity of the trabecular meshwork to function properly to drain fluid from the eye. This causes an increase in intraocular pressure. At the same time due to the thickened cornea it is more difficult to detect glaucoma, partly because the thickened cornea may contribute to an inaccurate interpretation of eye pressure even if the pressure is not elevated. People with thickened cornea may show elevated eye pressure but that higher eye pressure may be "normal" for them. Patients with myopic macular degeneration have to wear very thick eye glass lenses which makes testing of their peripheral vision more difficult.
the cornea itself plays a role in focusing. In fact the correct alignment of fibers within the cornea contribute 65% to 75% of the focusing ability of the eye.Vitreous The vitreous gel may thin and liquefy increasing the risk of vitreous detachment.