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Take a card you have at hand

This is the approximate width of standard size lenses.

Stand in front of a mirror

Place the edge of the credit card at the center of your nose and take a good look; where does the other edge of the card end?

Find out your lens size

• If the edge of the credit card ends where your eye ends, your size is medium.
• If the edge of the card extends past the end of your eye, your size is small.
• If the edge of the card does not reach the end of your eye, your size is large.