A question many newbie wearers have is: “How can I tell if my contact lens is inside-out?”

The difference can be subtle, but before placing a contact lens on your eye, make sure it looks like half a ball, not a soup bowl with a rim.

The trick is to place the lens on your finger so that a cup is formed. Then hold the lens up directly in front of your eyes so you’re looking at the side of the cup.

If the lens forms a “U” with the top edges flared out, it’s inside out. If it forms just a “U,” it’s in the correct position.

If you’re wearing lenses with a handling tint, another way is to place the lens on your fingertip and then look down at it. The edge of a tinted lens should look very blue (or green, depending on the tint); that won’t be the case if the lens is inverted.

Some contact lenses also have a laser marking, such as the brand name, on the edge to help you. If you can read it properly, the lens is not inside out.

Don’t worry if you place a contact lens in your eye inside out. The lens will feel uncomfortable, but it can’t do any damage.

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