Hans, you have mentioned most of your grandparents lived into their 90. Did they have any eye problems like the senile cataracts? Most of my relatives now in their early 70ties are developing the age-related cataracts and one of them had it already surgically removed. Strange enough even the pets are suffering from this disease now. The doctors say it's because people and their pets are living much longer than before these days ...
http://en.wikipedia.org/wiki/Cataract
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