Our summer eyes faced with a new problem sea reflections, and it is necessary to take correct preventive measures to protect them, but without excesses that could impair the health of vision.
According to Dr. Ainoa de Federico, specialist in natural vision, research professor at the University of Toulouse and author of the Clear Vision Method, reflecting or reflecting sunlight, especially large bodies of water, such as the sea, can significantly affect our vision, especially during the summer months when the sun’s rays are more direct. These effects are due not only to the high intensity of light, but also to the special qualities of light reflected from water surfaces.
“Water, being a reflective surface, can act as mirrorespecially when viewed from a low angle. Sunlight is made up of spectrum of light waves which, when hitting the surface of the water, are reflected in our eyes. This results in an increase in light intensity that can be many times greater than what our eyes are normally adapted to,” explains Dr. de Federico.
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There are several specific ways that this reflection affects our vision:
1. Glare: Increasing the brightness can cause significant glare, reducing visual contrast and making it difficult to discern details. Glare can make us squint and experience discomfort or, in more extreme cases, temporary blindness.
2. UV radiation: Sunlight contains ultraviolet (UV) radiation. The ozone layer, which has recovered markedly in recent years (the ozone hole is closing and on its way to full recovery), is absorbing much of this, but the UV radiation reaching the surface can be detrimental. Water reflects up to 100% of UV radiation that can be harmful to our eyes, potentially leading to conditions such as photokeratitis (similar to corneal sunburn) and, over time, more serious conditions such as cataracts or macular degeneration.
3. Blue light: The light reflected from the sea surface is also rich in short wavelength blue light. High exposure to blue light can cause discomfort and contribute to long-term damage to the retina.
The above impacts are especially relevant in summer, given the more direct sunlight and longer daylight hours.
However, the human visual system has protective and adaptive mechanisms such as pupillary constriction, frequent blinking, squinting, and even the aversion reflex to avoid looking directly at extremely bright light sources.
The use of UV and blue light filtering sunglasses and hats can greatly help mitigate these effects. It is important to protect your eyesight on highly reflective surfaces such as water, snow or even sand, especially in summer.
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Sunglasses yes, but intermittently
However, wearing sunglasses all the time, even in summer, is not a smart option, as your eyes require exposure to the full spectrum of sunlight for good health:
To) Information about the quality, intensity and temperature of sunlight is necessary for the body to regulate the circadian cycle. If you constantly confuse your eyes with sunglasses, this can lead to an imbalance in the nervous and endocrine systems.
b) Blue light during the day prevents nearsightedness, and red light at dusk and dawn promotes energy production by the mitochondria of retinal cells, thus maintaining a healthier macula and less prone to degeneration. Permanent deprivation of the eyes of these light frequencies due to wearing sunglasses at any time can be harmful in the medium to long term.