A little research on cataracts and the possible causes/increased risk factors -
Cataract development is usually a very gradual process of normal aging but can occasionally occur rapidly.
Rarely, cataracts can present at birth or in early childhood as a result of hereditary enzyme defects, and severe trauma to the eye, eye surgery, or intraocular inflammation can also cause cataracts to occur earlier in life. Other factors that may lead to development of cataracts at an earlier age include excessive ultraviolet-light exposure, diabetes, smoking, or the use of certain medications, such as oral, topical, or inhaled steroids. Other medications that are more weakly associated with cataracts include the long-term use of statins and phenothiazines.
There is an even more specific change that occasionally happens, when the opacity develops immediately next to the lens capsule, either by the anterior, or more commonly the posterior, portion of the capsule; these are called subcapsular cataracts. Unlike most cataracts, posterior subcapsular cataracts can develop rather quickly and affect vision more suddenly than either nuclear or cortical cataracts.
The closer people live to the equator the greater the chance for cataracts. As suggested by a study in Southern France, sunlight exposure in these climates also increases the risk for severe cortical or mixed cataracts. In this study, even wearing sunglasses did not reduce the risk for these cataracts, although it did for posterior subcapsular cataracts.
People whose jobs expose them to sunlight for prolonged periods are at higher risk. People in Southern climates whose occupations, such as fishing or oyster farming, exposed them to very intense sunlight were at high risk for all cataracts, including posterior subcapsular cataracts. (People in more Northern climates with similar occupations may not have as high a risk.)
Occupational exposure to very intense artificial light, such as arc welding, increases the risk for cataracts.
Long-term environmental lead exposure may increase the risk of developing cataracts
Smoking
Heavy alcohol usage
Other conditions that can trigger the process leading to cataracts include:
Physical injury to the eye (such as a hard blow, cut, or puncture)
Chemical burns
Electrical shock injuries
Chronic exposure to intense heat or cold
Exposure to cosmic radiation (airline pilots, astronauts)