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The intense solar radiation can damage the eyes. Not only the skin is affected by sunlight. The light which our eyes are necessary for proper vision, may be harmful if it alters its delicate organic structures. By Rosa Guerrero

The eye is very complex mechanism. The interior of the eye is filled with cells that absorb light and convert it into a nerve signal sent to the brain. Visual acuity of human beings depends on the macula, a small area of less than 1 mm2, located in the center of the retina, very sensitive to light, to free radical oxidation and degeneration. Over time and repeated exposure to natural and artificial light, the macula and retina undergo changes that can trigger age-related macular degeneration (AMD) and cataracts (cloudy lenses), conditions that cause decreased vision and even blindness . The DMS starts slowly with blurred vision in the central part and it can deteriorate to the point where black spots appear to obscure the visual field. Cataracts affect nearly 50% of people between 65 and 75 years and approximately 70% of those over 75.

Factors influencing the intensity of solar radiation
Reflection is a phenomenon that can increase markedly the amount of light coming into her eyes. Several factors contribute to the increase or decrease in the intensity received:
- Latitude and altitude above sea level.
- Station of the year and time of day.
- Environmental factors: clouds, fog, pollution.
- Reflection of light on white surfaces or bright, the snow reflects between 70-90% of the sun, white sand 25% and water between 30-35%.