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Place the lens on the tip of your index finger.

Hold it under a light source to help you see better.

Check the edge of your lens.

If the edges flare out, it's inside out. Your lens should look like a bowl with straight edges.

Look out for the ‘1,2,3’ indicator.

Except for DEFINE® and ACUVUE® Astigmatism lenses, look out for the 1, 2, 3 indicator. If you can read the numbers in order, your lens is flipped correctly.