Stains from the iris caused by exposure to the sun.

Eyes can be a good indicator of health problems. In addition to eye diseases, cataracts or glaucoma, information can also be found about systemic conditions such as diabetes mellitus or cardiovascular disease. The most recent study by ARVO scientists shows that dark spots on the iris (so-called freckles) are more common in people who have been exposed for a while . Although they are not malignant, stains may indicate the presence or risk of diseases caused by sunlight, such as cataracts or macular degeneration. The development of dark spots on the iris was correlated with the older age, with the number of lifetime sunburns and severe sunburn, resulting in fluid blisters. Unfortunately, people are generally not aware of the very high risk their eyes face because of exposure to ultraviolet.

Overexposure to ultraviolet radiation may cause harmful changes in the cornea, conjunctiva and lens. The study involved 600 swimmers from Austria. They had their eyes examined to find the The results showed that dark-haired people had fewer spots, and those who protected themselves from harmful sun rays. An unexpected finding was the location of the iris spots. Researchers found that the stains were positioned away from the nose in the outer dial.

This is due to the fact that eyebrows and nose protect the sun's eye, thus reducing exposure and the risk of developing spots. Solar radiation - the main cause of skin, eye, and cataracts cancer Solar radiation has many harmful effects on the human body: sun is the main factor for aging skin, causing change in texture, color, appearance of spots and superficial wrinkles. It also causes skin cancers, such as basal cell carcinoma (most common skin cancer, but with the best survival rate because it does not metastasize), spinocellular carcinoma (second as frequency, but can metastasize and grow faster . Eight eye cancers, of which coroid melanoma is the most frequent and lethal, or melanoma of the iris, rarely met, but can also metastasize. Last but not least, the risk of cataracts increases exponentially as a result of exposure to the sun.

This is why populations living at altitude, for example in Nepal, have a very high rate, over 90%, of early cataract. .