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A QUICK SELF TEST
The first sign of the problem may be distortion of straight lines when looking at a grid- perhaps your window frame for instance.
There is a chart, the Amsler, designed to check this, at home or at your Opticians. A home self-test has to be the quickest option, and speed as we will show, is the essential element in both diagnosis and treatment. Any distortion- contact your Optician/Optometrist at once.